W641GG2JB Datasheet, PDF (23/109 Pages) Winbond – 1-Gbit GDDR3 Graphics SDRAM

W641GG2JB
1-Gbit GDDR3 Graphics SDRAM
6.3 Commands
In the following table CKEn refers to the positive edge of CLK corresponding to the clock cycle when the command is given to the
Graphics SDRAM. CKEn-1 refers to the previous positive edge of CLK. For all command and address inputs CKEn is implied.
All input states or sequences not shown are illegal or reserved.
6.3.1 Command Overview for 1-CS mode
Operation
Code
Device Delselect
DESEL
L XX
H
H H X XL X X X
X
H HH
X
1
Data Terminator Disable
DTERDIS
H
H H HLH X X X
X
X
1,2
No Operation
NOP
H
H L HHH X X X
X
X
Mode Register Set
MRS
H
H L LLL 0 0 0
OPCODE
Extended Mode Register Set EMRS
H
H L LLL 1 0
OPCODE
Extended Mode Register Set 2 EMRS2
H
H L LLL 0 1 0
OPCODE
Bank Activate
ACT
H
H L L H H BA BA BA
Row Adress
1,3
Read
RD
H
H L H L H BA BA BA
L
Col.
Read w/ Autoprecharge
RD/A
H
H L H L H BA BA BA
H
Col.
Write
WR
H
H L H L L BA BA BA
L
Col.
1,4
Write w/ Autoprecharge
WR/A
H
H L H L L BA BA BA
H
Col.
Precharge
PRE
H
H L L H L BA BA BA
L
X
1,4
Precharge All
PREALL
H
H L LHL X X X
H
X
Auto Refresh
AREF
H
H L L LH X X X
X
X
1,5
Power Down Mode Entry
PWDNEN
H
L
H
L
X XX
H HH
X
X
X
X
X
1,6
Power Down Mode Exit
PWDNEX
L
H X XXX X X X
X
X
1,7
Self Refresh Entry
SREFEN
H
L L L LH X X X
X
X
1,8
Self Refresh Exit
SREFEX
L
H X XXX X X X
X
X
1,9
Notes :
1. X represents ―Don‘t Care‖.
2. This command is invoked when a Read is issued on another DRAM rank placed on the same command bus. Cannot be in power-down or self-
refresh state. The Read command will cause the data termination to be disabled.
3. BA0 - BA2 provide bank address, A0 - A11, A12 provide the row address.
4. BA0 - BA2 provide bank address, A2 - A7, A9 provide the column address, A8/AP controls Auto Precharge.
5. Auto Refresh and Self Refresh Entry differ only by the state of CKE.
6. PWDNEN is selected by issuing a DESEL or NOP at the first positive CLK edge following the HIGH to LOW transition of CKE.
7. First possible valid command after t_XPN. During t_XPN only NOP or DESEL commands are allowed.
8. Self Refresh is selected by issuing AREF at the first positive CLK edge following the HIGH to LOW transition of CKE.
9. First possible valid command after t_XSC. During t_XSC only NOP or DESEL commands are allowed.
- 23 -
Publication Release Date: Apr, 22, 2011
Revision A01-002