8gb: 2 channels x16/x8 gddr6 sgramcaxapa.ru/thumbs/810658/gddr6_sgram_8gb_brief.pdfca7_a ca7_b ca5_a...

GDDR6 SGRAMMT61K256M322 Channels x 256 Meg x 16 I/O, 2 Channels x 512 Meg x 8 I/O

Features• VDD = VDDQ = 1.35V ±3%• VPP = 1.8V –3%/+6%• Data rate: 12 Gb/s, 13 Gb/s, 14 Gb/s• 2 separate independent channels (x16)• x16/x8 and 2-channel/pseudo channel (PC) mode

configurations set at reset• Single ended interfaces per channel for command/

address (CA) and data• Differential clock input CK_t/CK_c for CA per 2

channels• One differential clock input WCK_t/WCK_c per

channel for data (DQ, DBI_n, EDC)• Double data rate (DDR) command/address (CK)• Quad data rate (QDR) and double data rate (DDR)

data (WCK), depending on operating frequency• 16n prefetch architecture with 256 bits per array

read or write access• 16 internal banks• 4 bank groups for tCCDL = 3tCK and 4tCK• Programmable READ latency: 9 to 20• Programmable WRITE latency: 5 to 7• Write data mask function via CA bus with single and

double byte mask granularity• Data bus inversion (DBI) and CA bus inversion

(CABI)• Input/output PLL• CA bus training: CA input monitoring via DQ/

DBI_n/EDC signals• WCK2CK clock training with phase information via

EDC signals• Data read and write training via read FIFO (depth =

6)• Read/write data transmission integrity secured by

cyclic redundancy check using half data rate CRC• Programmable CRC READ latency = 2 to 3• Programmable CRC WRITE latency = 10 to 14• Programmable EDC hold pattern for CDR• RDQS mode on EDC pins

• Low power modes• On‐chip temperature sensor with read‐out• Auto precharge option for each burst access• Auto refresh mode (32ms, 16k cycles) with per-bank

and per-2-bank refresh options• Temperature sensor controlled self refresh rate• Digital tRAS lockout• On‐die termination (ODT) for all high‐speed inputs• Pseudo open drain (POD‐135) compatible outputs• ODT and output driver strength auto calibration

with external resistor ZQ pin (120Ω)• Internal VREF with DFE for data inputs, with input

receiver characteristics programmable per pin• Selectable external or internal VREF for CA inputs;

programmable VREF offsets for internal VREF• Vendor ID for device identification• IEEE 1149.1 compliant boundary scan• 180-ball BGA package• Lead-free (RoHS-compliant) and halogen-free

packaging• TC = 0°C to +95°C

Options1 Marking• Organization

– 256 Meg × 32 (words × bits) 256M32• FBGA package

– 180-ball (12.0mm × 14.0mm) JE• Timing – maximum data rate

– 12 Gb/s -12– 13 Gb/s -13– 14 Gb/s -14

• Operating temperature – Commercial (0°C ≤ TC ≤ +95°C) None

• Revision A

Note: 1. Not all options listed can be combined todefine an offered product. Use the partcatalog search on http://www.micron.comfor available offerings.

Advance‡

8Gb: 2 Channels x16/x8 GDDR6 SGRAMFeatures

CCMTD-1412786195-10191gddr6_sgram_8gb_brief.pdf - Rev. D 10/17 EN 1 Micron Technology, Inc. reserves the right to change products or specifications without notice.

© 2016 Micron Technology, Inc. All rights reserved.

‡Products and specifications discussed herein are for evaluation and reference purposes only and are subject to change byMicron without notice. Products are only warranted by Micron to meet Micron's production data sheet specifications.

http://www.micron.com

Figure 1: Part Numbering

Micron Memory

Configuration256M32 = 256 Meg x 32

Product Family61 = GDDR6 SGRAM

Operating VoltageK = 1.35V

PackageJE = 180-ball FBGA, 12.0mm x 14.0mm

61 KMT 256M32 JE -14 : ARevision A

Temperature: = Commercial

Data Rate-12 = 12 Gb/s-13 = 13 Gb/s-14 = 14 Gb/s

FBGA Part Marking Decoder

Due to space limitations, FBGA-packaged components have an abbreviated part marking that is different from thepart number. For a quick conversion of an FBGA code, see the FBGA Part Marking Decoder on Micron’s web site: http://www.micron.com.

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8Gb: 2 Channels x16/x8 GDDR6 SGRAMFeatures



http://www.micron.com

Operating Frequency Ranges

Figure 2: Operating Frequency Ranges

14.0

MT61K256M32JE-14

MT61K256M32JE-13

MT61K256M32JE-12

RDQS Mode

[Gb/s/pin]0.4 2.0 4.0 6.0 7.0

7.0

7.0

12.08.0 10.0

GDDR6 High SpeedGDDR6 Low Speed

RDQS Mode

[Gb/s/pin]0.4 2.0 4.0 6.0 12.08.0 10.0

RDQS Mode

[Gb/s/pin]0.4 2.0 4.0 6.0 12.08.0 10.0

13.0

GDDR6 Low Speed GDDR6 High Speed

GDDR6 Low Speed GDDR6 High Speed

Table 1: Operating Frequency Ranges

Operating Mode Symbol

-12 -13 -14

UnitMin Max Min Max Min Max

GDDR6 High Speed fCK 875 1500 875 1625 875 1750 MHzfWCK 1750 3000 1750 3250 1750 3500

GDDR6 Low Speed fCK 50 875 50 875 50 875fWCK 200 3500 200 3500 200 3500

RDQS Mode fCK 50 250 50 250 50 250fWCK 200 1000 200 1000 200 1000

Note: 1. This Micron GDDR6 SGRAM is available in different speed bins. The operating range andAC timings of a faster speed bin are a superset of all slower speed bins. Therefore it issafe to use a faster bin device as a drop-in replacement of a slower bin device when op-erated within the supply voltage and frequency range of the slower bin device.

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8Gb: 2 Channels x16/x8 GDDR6 SGRAMOperating Frequency Ranges



Ball Assignments and Descriptions

Figure 3: 180-Ball FBGA (Top View)

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

T

V

U

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

T

V

U

GroundSupplyOther signalCommand/Address

Data

6 7 8 9 14

V DD

VSS

VDDQ

VSS

VDDQ

VSS

VSS

VSS

VSS

VSS

VDD

VSS

VSS

VDDQ

VSS

VDD

VSS

VDDQ

VSS

VSS

13

VSS

ZQ_A

ZQ_B

VDDQ

VDDQ

VDD

VDDQ

VDDQ

12

DQ11_A

DQ13_A

DQ15_A

VSS

VSS

11

DQ10_A

DQ9_A

VSS

DQ12_A

DQ14_A

10

VSS

5

VPP

VDDQ

VSSVSS

VSS

VSS

WCK_c

VDD

VDD

VDDQ

VDDQ

VPP

4

VSS

DQ0_ADQ2_A

WCK_t_A _A

VDDQ

DQ4_A

DQ6_A

CA2_B

CA2_A

CA8_A

CA8_B

CA0_A

CA0_B

CA9_A CA6_A

CA6_B

CA3_B

CA9_B

CA4_A CA3_A

CA4_B

3

DQ1_A

DQ3_A

EDC0_A EDC1_A

DBI0_n_A DBI1_n_A

CABI_n_A

CABI_n_B

DQ5_A

DQ7_A

DQ0_BDQ2_B

DQ4_B

DQ6_B

DQ1_B

DQ3_B

EDC0_B

DBI0_n_B

DQ5_B

DQ7_B

DQ10_B

DQ9_B

DQ12_B

DQ11_B

DQ14_B

EDC1_B

DBI1_n_B

DQ13_B

DQ15_B

VSSVSS

VSS

2

VSS

VDDQ

TMS

NC

NC

NC NC

VDDQ

VDDQ

VDD

TCK

VSS VSS

1

VSS

VSS

VSS

VDDQ

VSS

VSS

VSS

VSS

VDD

VSS

VSS

VDDQ

TDO VDDQ

VDDQ

TDI

VSS

VDDQ

VSS

DQ8_A

VSS

VSS

CKE_n_A

CKE_n_B

CK_t

VSS

VPP

VDDQ

VSS

VDD

VDDQ

CK_c

VDD

VPP

WCK_t_B

WCK_c_B

CA7_A

CA7_B

CA5_A

CA1_A

CA5_B

CA1_B

DQ8_B

NCNC

RESET _n

VDD

VSS

VDDQ

VSS

VDDQ

VSS

VSS

VDDQ

VREFC

VDDQ

VSS

VSS

VDDQ

VSS

VDDQ

VSS

VDD

Note: 1. Channel A byte 1 and channel B byte 0 are disabled when the device is configured to x8mode.

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8Gb: 2 Channels x16/x8 GDDR6 SGRAMBall Assignments and Descriptions



Table 2: 180-Ball FBGA Ball Descriptions

Symbol Type Description

CK_t,CK_c

Input Clock: CK_t and CK_c are differential clock inputs. CK_t and CK_c do not have chan-nel indicators as one clock is shared between both channel A and channel B on a de-vice. Command address (CA) inputs are latched on the rising and falling edge of CK.All latencies are referenced to CK.

WCK_t,WCK_c

Input Write clock: WCK_t and WCK_c are differential clocks used for write data captureand read data output. WCK_t/WCK_c are associated with DQ[15:0], DBI[1:0]_n, andEDC[1:0].

CKE_n Input Clock enable: CKE_n LOW activates and CKE_n HIGH deactivates the internal clock,device input buffers, and output drivers excluding RESET_n, TDI, TDO, TMS, and TCK.Taking CKE_n HIGH provides PRECHARGE POWER-DOWN and SELF REFRESH opera-tions (all banks idle), or ACTIVE POWER-DOWN (row ACTIVE in any bank). CKE_nmust be maintained LOW throughout read and write accesses.

CA[9:0] Input Command address (CA): The CA inputs receive packetized DDR command, addressor other information, for example, the op-code for the MRS command. See Com-mand Truth Table for details.

CABI_n Input Command address bus inversion

DQ[15:0] I/O Data input/output: Bidirectional 16-bit data bus.

DBI[1:0]_n I/O Data bus inversion: DBI0_n is associated with DQ[7:0], DBI1_n is associated withDQ[15:8].

EDC[1:0] Output Error detection code: The calculated CRC data is transmitted on these signals. Inaddition these signals drive a "hold" pattern when idle. EDC0 is associated withDQ[7:0], EDC1 is associated with DQ[15:8].

VDDQ Supply I/O power supply: Isolated on the die for improved noise immunity.

VDD Supply Power supply

VSS Supply Ground

VPP Supply Pump voltage

VREFC Supply Reference voltage for CA, CABI_n, and CKE_n signals

ZQ Reference External reference for auto calibration

TDI Input JTAG test data input

TDO Output JTAG test data output

TMS Input JTAG test mode select

TCK Input JTAG test clock

RESET_n Input Reset: RESET_n low asynchronously initiates a full chip reset. With RESET_n LOW allODTs are disabled. A full chip reset may be performed at any time by pulling RE-SET_n LOW.

NC – No connect

Note: 1. Index "_A" or "_B" represents the channel indicator "A" and "B" of the device. Signalnames including the channel indicator are used whenever more than one channel is ref-erenced, for example, with the ball assignment. The channel indicator is omitted when-ever features and functions common to both channels are described.

Advance

8Gb: 2 Channels x16/x8 GDDR6 SGRAMBall Assignments and Descriptions



Package Dimensions

Figure 4: 180-Ball FBGA (JE)

EFG

0.6 CTRnonconductive

overmold

0.12

Seating plane

0.1 A

Ball A1 ID(covered by SR)

Ball A1 ID

A

0.34 ±0.05

1.1 ±0.1

9.75 CTR

12 ±0.1

0.75 TYP

12.75 CTR

14 ±0.1

180X Ø0.47Dimensions applyto solder balls post-reflow on Ø0.42 SMDball pads.

0.75 TYP

123101112

ABCD

HJKLMNPRTUV

451314

Notes: 1. Package dimension specification is compliant to JC11 MO328 variation P14.0x12.0-GJ-180A.

2. All dimensions are in millimeters.3. Solder ball material: SAC-Q (92.5% Sn, 4% Ag, 3% Bi, 0.5% Cu).

Advance

8Gb: 2 Channels x16/x8 GDDR6 SGRAMPackage Dimensions



Functional DescriptionThe GDDR6 SGRAM is a high-speed dynamic random-access memory designed for ap-plications requiring high bandwidth. It is internally configured as 16‐bank memory andcontains 8,589,934,592 bits.

The GDDR6 SGRAM’s high-speed interface is optimized for point-to-point connectionsto a host controller. On-die termination (ODT) is provided for all high-speed interfacesignals to eliminate the need for termination resistors in the system.

GDDR6 uses a 16n-prefetch architecture and a DDR or QDR interface to achieve high-speed operation. The device’s architecture consists of two 16-bit-wide fully independ-ent channels.

Read and write accesses to GDDR6 are burst oriented; accesses start at a selected loca-tion and consist of a total of 16 data words. Accesses begin with the registration of anACTIVATE command, which is then followed by a READ, WRITE (WOM), or maskedWRITE (WDM, WSM) command. The row and bank address to be accessed is registeredcoincident with the ACTIVATE command. The address bits registered coincident withthe READ, WRITE, or masked WRITE command are used to select the bank and thestarting column location for the burst access.

Clocking

GDDR6 operates from a differential clock CK_t and CK_c. CK is common to both chan-nels. Command and address (CA) are registered at every rising and falling CK edge.There are both single-cycle and multi-cycle commands. See Command Truth Table fordetails.

GDDR6 uses a free running differential forwarded clock (WCK_t/WCK_c) with both in-put and output data registered and driven respectively at both edges of the forwardedWCK.

GDDR6 supports DDR and QDR operating modes for WCK frequency which differ inthe DQ/DBI_n pin to WCK clock frequency ratio. The figure below illustrates the differ-ence between both modes.

This GDDR6 SGRAM device is designed with a WCK/word granularity which is equiva-lent to one WCK per channel. The DRAM info bits for WCK granularity, WCK frequency,and internal WCK can be read by the host during the initialization process to determinethe WCK architecture for the device.

Table 3: Example Clock and Interface Signal Frequency Relationship

Pin DDR WCK QDR WCK Unit

CK_t, CK_c 1.5 1.5 GHz

CA 3.0 3.0 Gb/s/pin

WCK_t, WCK_c 6.0 3.0 GHz

DQ, DBI_n 12.0 12.0 Gb/s/pin

EDC 6.0 6.0 Gb/s/pin

Advance

8Gb: 2 Channels x16/x8 GDDR6 SGRAMFunctional Description



Figure 5: Clocking and Interface Relationship

CK_c

CK_t

DQ, DBI_n

EDC

CA

QDR WCK

DDR WCK

f (for example, 1.5 GHz)

2f (for example, 3 Gb/s)

2f (for example, 3 GHz)

4f (for example, 6 GHz)



Note: 1. The figure shows the relationship between the data rate of the buses and the clocks; itis not a timing diagram.

Figure 6: Block Diagram of an Example Clock System

GDDR6 SGRAM

CA(3 Gb/s)

to internal state machineCMD/ADD

ADD/CMD sampled by CK_t/CK_c as DDR

CK_t, CK_c(1.5 GHz)

6 GHz)

D Q

WCK_t, WCK_c(3 GHz or

to EDC pin

WCK2CK Alignment

/2/4 PLL Internal WCK

3.0 GHz

PLLData Tx/Rx

DRAM Core

Controller

DQ

D Q

clock phase ctrl

WRITEdata

clock phase ctrl

READdata

DATA(12 Gb/s)

ADD/CMD centered with CK_t/CK_c

D Q

D Q

Osc.

DQ

early/ late

D Q

Advance




Addressing

GDDR6 addressing is defined for a single channel with devices having two channels perdevice.

Table 4: Addressing

Parameter

8Gb Density

x16 Mode x8 Mode

Number of channels 2

Memory density (per channel) 4Gb

Memory prefetch (per channel) 256b 128b

Bank address (per channel) BA[3:0]

Row address (per channel) R[13:0]

Column address (per channel) C[5:0] C[6:0]

Page size (per channel) 2KB

Refresh 16k/32ms

Notes: 1. The column address notation for GDDR6 does not include the lower four address bits asthe burst order is always fixed for READ and WRITE.

2. Page size = 2^COLBITS × (Prefetch_Size/8) where COLBITS is the number of column ad-dress bits.

Advance




Operations

Command Truth Table

GDDR6 uses a packetized DDR command/address bus that encodes all commands andaddresses on a 10-bit CA bus as outlined in the table below.

Figure 7: Command Truth Table

NO OPERATION

MODE REGISTER SET

Operation

ACTIVATE

READ

READ with AUTO PRECHARGE

LOAD FIFO

READ TRAINING

WRITE

WRITE withAUTO PRECHARGE

WRITE SINGLEBYTE MASK

NOP (1)

NOP (2)

NOP (3)

MRS

Symbol

ACT

RD

RDA

LDFF

RDTR

WOM

WOMA

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

CKEdge

L

L

L

L

n - 1

L

L

L

L

L

L

L

L

L

L

L

L

n

CKE_n

L

L

L

L

L

L

L

L

H

H

H

H

H

H

H

R13

L

L

L

H

L

H

L

H

L

H

L

H

CA9

H

H

H

H

L

H

H

H

H

H

H

L

L

H

L

V

R12

H

H

H

H

H

H

H

H

H

L

H

L

H

L

H

CA8

H

H

H

L

V

V

V

V

V

V

OP11

BA3

BA3

BA3

BA3

BA3

R11

L

L

B3

H

V

H

L

L

L

Byte 0BST7

CA7

BA3

Byte 0BST15

Byte 1BST7

Byte 1BST15

M3

V

V

V

V

V

V

OP10

BA2

BA2

BA2

BA2

BA2

R10

L

L

B2

L

V

H

L

L

H

CA6

BA2

Byte 0BST6

Byte 0BST14

Byte 1BST6

Byte 1BST14

M2

V

V

V

V

V

V

OP9

BA1

BA1

BA1

BA1

BA1

R9

V

V

B1

D9

V

V

V

V

V

BA1

Byte 0BST5

Byte 0BST13

Byte 1BST5

Byte 1BST13

M1

V

V

V

V

V

V

OP8

BA0

BA0

BA0

BA0

BA0

R8

L

H

B0

D8

V

L

L

H

L

BA0

Byte 0BST4

Byte 0BST12

Byte 1BST4

Byte 1BST12

M0

V

V

V

V

V

V

OP7

R3

R7

C3

CE

C3

CE

D3

D7

V

CE

C3

CE

C3

CE

C3

CE

Byte 0BST3

Byte 0BST11

Byte 1BST3

Byte 1BST11

OP3

V

V

V

V

V

V

OP6

R2

R6

C2

C6

C2

C6

D2

D6

V

V

C2

C6

C2

C6

C2

C6

Byte 0BST2

Byte 0BST10

Byte 1BST2

Byte 1BST10

OP2

V

V

V

V

V

V

OP5

R1

R5

C1

C5

C1

C5

D1

D5

V

V

C1

C5

C1

C5

C1

C5

Byte 0BST1

Byte 0BST9

Byte 1BST1

Byte 1BST9

OP1

V

V

V

V

V

V

OP4

R0

R4

C0

C4

C0

C4

D0

D4

V

V

C0

C4

C0

C4

C0

C4

Byte 0BST0

Byte 0BST8

Byte 1BST0

Byte 1BST8

OP0

1, 10

1, 2, 3

1, 2, 4

1, 2, 5,6

1, 2, 5,6

1, 2, 8

1, 2, 6

1, 2, 5,6

1, 2, 5,6

1, 2, 5,6

CA5 CA4 CA3 CA2 CA1 CA0 Notes

WSM

Advance




Figure 8: Command Truth Table (Continued)

WSMAWRITE SINGLEBYTE MASK withAUTO PRECHARGE

Operation Symbol

WDMAWRITE DOUBLEBYTE MASK withAUTO PRECHARGE

WRITE DOUBLEBYTE MASK

WRTRWRITE TRAINING

PREpb

REFpb/REFp2b

PRECHARGE

PER-BANK REFRESH

REFabREFRESH

PREabPRECHARGE ALL

PDEPOWER-DOWN ENTRY

PDXPOWER-DOWN EXIT

SRESELF REFRESH ENTRY

SRXSELF REFRESH EXIT

CATCOMMAND/ADDRESSTRAINING CAPTURE

R

F

R

F

R

F

CKEdge

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

R

F

L

L

L

L

L

L

L

L

L

H

L

H

L

L

L

L

L

L

L

L

L

H

L

H

L

H

H

L

H

H

H

H

H

L

H

H

H

L

H

H

H

CA9

L

H

L

L

L

H

H

H

H

H

H

H

L

H

H

V

V

H

L

H

L

H

H

H

H

CA8

H

L

H

H

L

H

H

H

H

L

L

L

H

L

L

H

L

H

H

H

H

H

H

H

V

V

L

L

L

Byte 0BST7

Byte 0BST15

Byte 1BST7

Byte 1BST15

BA3

CA7

BA3

H

H

BA3

BST7

BST7

BST15

Byte 0BST6

Byte 0BST14

Byte 1BST6

Byte 1BST14

H

BA2

CA6

BA2

L

L

BA2

BST6

BST6

BST14

Byte 0BST5

Byte 0BST13

Byte 1BST5

Byte 1BST13

V

BA1

CA5

BA1

V

V

BA1

BST5

BST5

BST13

Byte 0BST4

Byte 0BST12

Byte 1BST4

Byte 1BST12

H

BA0

CA4

BA0

L

H

BA0

BST4

BST4

BST12

Byte 0BST3

Byte 0BST11

Byte 1BST3

Byte 1BST11

C3

CE

CA3

C3

CE

C3

CE

BST3

BST3

BST11

Byte 0BST2

Byte 0BST10

Byte 1BST2

Byte 1BST10

C2

C6

CA2

C2

C6

C2

C6

BST2

BST2

BST10

Byte 0BST1

Byte 0BST9

Byte 1BST1

Byte 1BST9

C1

C5

CA1

C1

C5

C1

C5

BST1

BST1

BST9

Byte 0BST0

Byte 0BST8

Byte 1BST0

Byte 1BST8

C0

C4

CA0

C0

C4

C0

C4

BST0

BST0

BST8

BST15 BST14 BST13 BST12 BST11 BST10 BST9 BST8

V V V V V V V V

H H V L CE V V V

V

V

V

V

BA3

BA3

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

BA2

BA2

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

BA1

BA1

V

V

V

V

V

V

V

V

V

V

V

V

L

L

H

H

BA0

BA0

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

V

1, 2, 5,6

Notes

1, 2, 5,6

1, 2, 5,6

1, 2, 6

1, 2, 9

1, 2, 7,9

1, 2

1, 2, 7

1, 2

1, 2

1, 2, 7

1, 2

1, 2

n - 1 n

CKE_n

WDM

Notes: 1. H = Logic HIGH level; L = Logic LOW level; V = Valid signal (H or L, but not floating). R, F= Rising, Falling CK clock edge.

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2. Values shown for CA[9:0] are logical values; the physical values are inverted when com-mand/address bus inversion (CABI) is enabled and CABI_n = L.

3. M[3:0] provide the mode register address (MRA), OP[11:0] the opcode to be loaded.4. BA[3:0] provide the bank address, R[13:0] provide the row address.5. B[3:0] provide the bank address, C[6:0] provide the column address; no sub-word ad-

dressing within a burst of 16. BST[15:0] provide the write data mask for each burst posi-tion with WDM(A) and WSM(A) commands.

6. CE (channel enable) is intended for PC mode. The command is active when CE = H.When CE = L the data access is suppressed.

7. The command is REFRESH or PER-BANK REFRESH/PER-2-BANK REFRESH when CKE_n(n) =L and SELF REFRESH ENTRY when CKE_n(n) = H.

8. B[3:0] select the burst position, and D[9:0] provide the data.9. BA[3:0] provide the bank address.

10. CA8 must be HIGH on either the rising or falling (or both) CK clock edges.

Clamshell (x8) Mode Enable

A GDDR6 SGRAM-based memory system is typically divided into several channels.GDDR6 has been optimized for a 16-bit-wide channel. A channel can be comprised of asingle device operated in x16 mode, or two devices each operated in x8 mode. For x8mode the devices are typically assembled on opposite sides of the PCB in what is refer-red as a clamshell layout.

Whether in x16 mode or x8 mode the device will operate with a point-to-point connec-tion on the high-speed data signals. The disabled signals in x8 mode should all be in aHigh-Z state, non-terminating.

The x8 mode is detected at power-up on EDC1_A and EDC0_B. For x8 mode these sig-nals are tied to VSS; they are part of the bytes that are disabled in this mode and there-fore not needed for EDC functionality. For x16 mode these signals are active and alwaysterminated to VDDQ in the system or by the controller.

The configuration is set with RESET_n going HIGH. Once the configuration has beenset, it cannot be changed during normal operation. Typically, the configuration is fixedin the system. Details of the x8 mode detection are depicted in Figure 9. A comparisonof x16 mode and x8 mode systems is shown in Figure 10.

Table 5: Clamshell (x8) Mode Enable

Mode EDC0_A EDC1_A EDC0_B EDC1_B

x8 VDDQ VSS (on board) VSS (on board) VDDQ

x16 VDDQ (terminated by the system or controller)

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Figure 9: Enabling Clamshell (x8) Mode

D

EDC Data

ENTX

RX

x8

VDDQ

VSS

Enable Termination

RX

0 = x8

RESET_n

EDC

EDC data fromother DRAM

Controller GDDR6in x8 mode

non-mirrored

D

EDC Data

ENTX

RX

x8

VDDQ

VSS

EnableTermination

RX

0 = x8

RESET_n

EDC

EDC data fromother DRAM

Controller GDDR6in x8 modemirrored

EDC1_AEDC0_B

EDC1_AEDC0_B

EDC1_AEDC0_B

EDC1_AEDC0_B

EDC1_AEDC0_B

EDC0_AEDC1_B

D

EDC Data

ENTX

RX

x16

VDDQ

VSS

EnableTermination

RX

1 = x16

RESET_n

EDC

Controller GDDR6in x16 mode

RESET_n

RESET_n

RESET_n RESET_n

RESET_n

RESET_n

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Figure 10: System View for x16 and x8 Modes

CK_t, CK_cRESET_n

CA[9:0]_X, CABI_n_X

EDC0_XWCK0_t_X, WCK0_c_XWCK1_t_X, WCK1_c_X

EDC1_X

DQ[15:8]_X, DBI[3:2]_n_X

CKE_n_X

CA[9:0]_Y, CABI_n_Y

EDC1_YWCK1_t_Y, WCK1_c_YWCK0_t_Y, WCK0_c_Y

DQ[15:8]_Y, DBI[3:2]_n_Y

EDC0_Y

DQ[7:0]_Y, DBI[1:0]_n_Y

CKE_n_Y

CK_t, CK_cRESET_n

ADD/CMD

(Ch A)

(Ch B)

CA[9:0]_X, CABI_n_X

EDC1_A

EDC0_X

WCK_t_X, WCK_c_X

DQ[7:0]_X, DBI[1:0]_n_X DQ[7:0]_X, DBI[1:0]_n_X

EDC1_X

DQ[15:8]_X, DBI[3:2]_n_X

EDC0_A

CKE_n_X

ADD/CMDCA[9:0]_Y, CABI_n_Y

EDC0_B

Byte 1_B

EDC1_Y

WCK_t_Y, WCK_c_Y

DQ[15:8]_Y, DBI[3:2]_n_Y

EDC0_Y

DQ[7:0]_Y, DBI[1:0]_n_Y

EDC1_B

CKE_n_Y

WCK_A

WCK_B

Byte 1_A

Byte 0_B

GDDR6x16

Byte 0_A

Ch

ann

el X

Ch

ann

el Y

Host Host

Ch

ann

el X

Ch

ann

el Y

ADD/CMD

Byte 1_B

EDC0_B

EDC1_B

ADD/CMD

Byte 0_A

EDC1_A

EDC0_A

WCK_B

WCK_A

GDDR6x8

GDDR6x8

ADD/CMD

EDC1_A

EDC0_A

ADD/CMD

EDC0_B

Byte 1_B

EDC1_B

WCK_A

WCK_B

Byte 0_A

(Ch A) (Ch B)

(Ch B) (Ch A)

Figure 11 clarifies the use of x8 mode and how the bytes are enabled/disabled to givethe controller the view of the same bytes that a controller sees with a single x16 device.For a 16-bit channel using two devices in a clamshell design, byte 0 comes from channelA from the top device and byte 1 comes from channel B from the bottom device and willlook equivalent at the controller to a x16 mode.

Advance




Figure 11: Byte Orientation in Clamshell Topology

x8

x8

Legend:DataADD/CMDCK, WCK

x8 top

x8 bottom

Ch AByte

0

Ch BByte

1

Ch AByte

0

Ch BByte

1

Ch AByte

0

Ch BByte

1

Ch AByte

1

Ch BByte

0

+ =

Pseudo-Channel Mode

GDDR6 has been optimized for a 32B access across a 16-bit channel by providing aunique CA bus to each 16-bit-wide channel. For applications requiring fewer CA pins,GDDR6 includes support for a pseudo-channel (PC) mode where CA[9:4], CKE_n, andCABI_n on each channel are connected to a common bus, while CA[3:0] of each chan-nel are connected to a separate bus. The command truth table is organized such that inPC mode the same command is decoded in both pseudo-channels, but READ andWRITE commands support a unique column address to each pseudo-channel. In PCmode, CKE_n and CABI_n are also shared across pseudo-channels.

In PC mode, the only difference in the DRAM is that termination on CA[9:4], CKE_n,and CABI_n can be configured differently from CA[3:0]. PC mode can be selected duringinitialization by driving CA6 = LOW on both channels when RESET_n is driven HIGH.

Figure 12: CA Pins in Pseudo-Channel Mode

GDDR6

CA[3:0]_ACA[9:4]_A, CABI_n_A, CKE_n_A

CA[9:4]_B, CABI_n_B, CKE_n_BCA[3:0]_B

CA[3:0]_A

CA[9:4], CABI_n, CKE_n

CA[3:0]_B

Pseudo-Channel Mode Controller

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Operating Conditions

Absolute Maximum Ratings

Stresses greater than those listed may cause permanent damage to the device. This is astress rating only, and functional operation of the device at these or any other condi-tions above those indicated in the operational sections of this specification is not im-plied. Exposure to absolute maximum rating conditions for extended periods may ad-versely affect reliability.

Table 6: Absolute Maximum Ratings

Symbol Parameter Min Max Unit Notes

VDD Voltage on VDD pin relative to VSS –0.3 2.0 V 1

VDDQ Voltage on VDDQ pin relative to VSS –0.3 2.0 V 1

VPP Voltage on VPP pin relative to VSS –0.3 2.3 V 2

VIN/VOUT Voltage on any pins relative to VSS –0.3 2.0 V

TSTG Storage temperature –55 +125 °C

Notes: 1. VDD and VDDQ must be within 300mV of each other at all times the device is powered‐up.

2. VPP must be equal or greater than VDD and VDDQ at all times the device is powered‐up.

DC and AC Operating Conditions

The interface of GDDR6 with 1.35V VDDQ will follow the POD135 Standard (JESD8-21),Class D. All AC and DC values are referenced to the ball.

Table 7: DC Operating Conditions

Symbol Parameter Min Typ Max Unit Notes

VDD Device supply voltage 1.3095 1.35 1.3905 V 1

VDDQ Output supply voltage 1.3095 1.35 1.3905 V 1

VPP Pump voltage 1.746 1.8 1.908 V 2

VREFD Reference voltage for DQ and DBI_n 0.69 × VDDQ – 0.71 × VDDQ V 3, 4

VREFD2 0.49 × VDDQ – 0.51 × VDDQ V 3, 4, 5

VREFC Reference voltage for CA 0.69 × VDDQ – 0.71 × VDDQ V 3, 6

VREFC2 0.49 × VDDQ – 0.51 × VDDQ V 3, 6, 7

VIHA(DC) DC input logic HIGH voltage with VREFC for CA VREFC + 0.135 – – V

VILA(DC) DC input logic LOW voltage with VREFC for CA – – VREFC ‐ 0.135 V

VIHA2(DC) DC input logic HIGH voltage with VREFC2 for CA VREFC2 + 0.27 – – V

VILA2(DC) DC input logic LOW voltage with VREFC2 for CA – – VREFC2 ‐ 0.27 V

VIHD(DC) DC input logic HIGH voltage with VREFD for DQ andDBI_n

VREFD + 0.09 – – V

VILD(DC) DC input logic LOW voltage with VREFD for DQ andDBI_n

– – VREFD ‐ 0.09 V

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8Gb: 2 Channels x16/x8 GDDR6 SGRAMOperating Conditions



Table 7: DC Operating Conditions (Continued)


VIHD2(DC) DC input logic HIGH voltage with VREFD2 for DQ andDBI_n

VREFD2 + 0.27 – – V

VILD2(DC) DC input logic LOW voltage with VREFD2 for DQ andDBI_n

– – VREFD2 ‐ 0.27 V

VIHR RESET_n and boundary scan input logic HIGH volt-age; EDC and CA input logic HIGH voltage for x16/x8mode, PC vs. 2-channel mode, CK and CA ODT selectat reset

0.8 × VDDQ – – V 8

VILR RESET_n and boundary scan input logic LOW volt-age; EDC and CA input logic LOW voltage for x16/x8mode, PC vs. 2-channel mode, CK and CA ODT selectat reset

– – 0.2 × VDDQ V 8

VIN Single ended clock input voltage level: CK_t, CK_c,WCK_t, WCK_c

–0.30 – VDDQ + 0.30 V 9

VMP(DC) CK_t, CK_c clock input midpoint voltage VREFC - 0.10 – VREFC + 0.10 V 10, 13

VIDCK(DC) CK_t, CK_c clock input differential voltage 0.198 – – V 11, 13

VIDWCK(DC) WCK_t, WCK_c clock input differential voltage 0.18 – – V 12, 14

IL Input leakage current (any input 0V ≤ VIN ≤ VDDQ; allother signals not under test = 0V)

–5 – 5 µA

IOZ Output leakage current (outputs are disabled; 0V ≤VOUT ≤ VDDQ)

–5 – 5 µA

VOL(DC) Output logic low voltage – – 0.56 V

ZQ External resistor value 115 120 125 Ω

Notes: 1. GDDR6 SGRAM devices are designed to tolerate PCB designs with separate VDD andVDDQ power regulators.

2. DC bandwidth is limited to 20 MHz.3. AC noise in the system is estimated at 50mV peak-to-peak for the purpose of DRAM de-

sign.4. The reference voltage source and control for DQ and DBI_n pins are determined by half

VREFD, and VREFD level mode register bits.5. Programmable VREFD levels are not supported with VREFD2.6. The reference voltage source (external or internal) is determined at power‐up; the refer-

ence voltage level is determined by half VREFC and the VREFC offset mode register bit.7. Programmable VREFC offsets are not supported with VREFC2.8. VIHR and VILR apply to boundary scan input pins TDI, TMS, and TCK. VIHR and VILR apply

to EDC and CA inputs at reset when latching default device configurations. VIHR and VILRalso apply to CA, CABI_n, CKE_n, CK, DQ, DBI_n, EDC, and WCK inputs when boundaryscan mode is active and input data are latched in the capture-DR TAP controller state.

9. Use VIHR and VILR when boundary scan mode is active and input data are latched in thecapture-DR TAP controller state.

10. This provides a minimum of 0.845V to a maximum of 1.045V with POD135, and is nor-mally 70% of VDDQ. DRAM timings relative to CK cannot be guaranteed if these limitsare exceeded.

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11. VIDCK is the magnitude of the difference between the input level in CK_t and the inputlevel on CK_c. The input reference level for signals other than CK_t and CK_c is VREFC.

12. VIDWCK is the magnitude of the difference between the input level on WCK_t and theinput level on WCK_c. The input reference level for signals other than WCK_t andWCK_c is either VREFC, VREFC2, VREFD, or VREFD2.

13. The CK_t and CK_c input reference level (for timing referenced to CK_t and CK_c) is thepoint at which CK_t and CK_c cross. Refer to the applicable timings in the AC Timingstable.

14. The WCK_t and WCK_c input reference level (for timing referenced to WCK_t andWCK_c) is the point at which WCK_t and WCK_c cross. Refer to the applicable timings inthe AC Timings table.

Table 8: AC Operating Conditions (For Design Only9)


VIHA(AC) AC input logic HIGH voltage with VREFC for CA VREFC + 0.18 – – V

VILA(AC) AC input logic LOW voltage with VREFC for CA – – VREFC ‐ 0.18 V

VIHA2(AC) AC input logic HIGH voltage with VREFC2 for CA VREFC2 + 0.36 – – V

VILA2(AC) AC input logic LOW voltage with VREFC2 for CA – – VREFC2 ‐ 0.36 V

VIHD(AC) AC input logic HIGH voltage with VREFD for DQ,DBI_n

VREFD + 0.135 – – V

VILD(AC) AC input logic LOW voltage with VREFD for DQ,DBI_n

– – VREFD ‐ 0.135 V

VIHD2(AC) AC input logic HIGH voltage with VREFD2 for DQ,DBI_n

VREFD2 + 0.36 – – V

VILD2(AC) AC input logic LOW voltage with VREFD2 for DQ,DBI_n

– – VREFD2 ‐ 0.36 V

VIDCK(AC) CK_t, CK_c clock differential voltage 0.36 – – V 1, 3, 5

VIDWCK(AC) WCK_t, WCK_c clock input differential voltage 0.27 – – V 1, 4, 6

VIXCK(AC) CK_t, CK_c clock input crossing point voltage VREFC - 0.108 – VREFC + 0.108 V 1, 2, 5

VIXWCK(AC) WCK_t, WCK_c clock input crossing point voltage VREFD - 0.09 – VREFD + 0.09 V 1, 2, 6, 7

Notes: 1. For AC operations, all DC clock requirements must be satisfied as well.2. The value of VIXCK and VIXWCK is expected to equal 70% VDDQ for the transmitting device

and must track variations in the DC level of the same.3. VIDCK is the magnitude of the difference between the input level on CK_t and the input

level on CK_c. The input reference level for signals other than CK_t and CK_c is VREFC.4. VIDWCK is the magnitude of the difference between the input level on WCK_t and the

input level on WCK_c. The input reference level for signals other than WCK_t andWCK_c is either VREFC, VREFC2, VREFD, or VREFD2.

5. The CK_t and CK_c input reference level (for timing referenced to CK_t and CK_c) is thepoint at which CK_t and CK_c cross. Refer to the applicable timings in the AC Timingstable.

6. The WCK_t and WCK_c input reference level (for timing referenced to WCK_t andWCK_c) is the point at which WCK_t and WCK_c cross. Refer to the applicable timings inthe AC Timings table.

7. VREFD is either VREFD, or VREFD2.

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8. Figure 14 (page 20) illustrates the exact relationship between (CK_t - CK_c) or (WCK_t -WCK_c) and VID(AC), VID(DC).

9. The AC operating conditions are for DRAM design only and are valid on the silicon atthe input of the receiver. They are not intended to be measured.

Figure 13: Voltage Waveform

VDDQ

VOH

System noise margin (power/ground,crosstalk, ISI, attenuation)

VIH(AC)

VIL(AC)

VIH(DC)

VREF + AC noiseVREF + DC errorVREF - DC errorVREF - AC noise

VIL(DC)

VIN(AC) provides marginbetween VOL(MAX) andVIL(MAX)

VOL,max

Output

Input

Note: 1. VREF, VIH, and VIL refer to whichever VREFxx (VREFD, VREFD2, VREFC, or VREFC2) is being used.

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Figure 14: Clock Waveform

Maximum clock level

Minimum clock level

VID(AC)

VID(DC)VIX(AC)VMP(DC)

CK_t

CK_c

8000 S. Federal Way, P.O. Box 6, Boise, ID 83707-0006, Tel: 208-368-4000www.micron.com/products/support Sales inquiries: 800-932-4992

Micron and the Micron logo are trademarks of Micron Technology, Inc.All other trademarks are the property of their respective owners.

This data sheet contains initial descriptions of products still under development.

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