HY5FS123235AFCP Datasheet, PDF (18/74 Pages) Hynix Semiconductor – 512M (16Mx32) GDDR4 SDRAM

HY5FS123235AFCP
Table 6
Truth Table Commands
NAME(FUNCTION)
CKE#
Previous Current ^{CS# RAS# CAS# WE#}
cycle cycle
ADDR
NOTES
DESELECT (NOP)
L
X
H
X
X
X
X
1, 7, 9
NO OPERATION(NOP)
L
X
L
H
H
H
X
1, 7
ACTIVE (SELECT BANK & activate row)
L
L
L
L
H
H Bank/Row 1, 3, 10
READ (Select bank and column, & start READ burst)
L
L
L
H
L
H Bank/Col 1, 4, 10
WRITE (Select bank and column, & start WRITE burst)
L
L
L
H
L
L Bank/Col 1, 4, 10
PRECHARGE (Deactivate row in bank or banks)
L
L
L
L
H
L
Code 1, 4, 5, 10
AUTO REFRESH
L
L
L
L
L
H
X
1, 6
SELF REFRESH ENTRY
L
H
L
L
L
H
X
1, 6
SELF REFRESH EXIT
H
X
X
X
X
1, 6
H
L
L
H
H
H
X
1, 6
POWER DOWN ENTRY
H
X
X
X
X
1
L
H
L
H
H
H
X
1
POWER DOWN EXIT
H
X
X
X
X
1
H
L
L
H
H
H
X
1
MODE REGISTER SET
L
L
L
L
L
L Op-Code 1, 2, 10
DATA TERMINATOR DISABLE
L
L
H
H
L
H
X
1, 8
Notes:
1) H = Logic High Level; L = Logic Low Level; X = Don’t care.
2) BA0-BA2 select either the mode register or the extended mode register (BA0 = 0, BA1 = 0, BA2=0 select the mode
register; BA0 = 1, BA1 = 0, BA2 = 0 select extended mode register; BA0 = 0, BA1 = 1, BA2 = 0 select extended
mode register 2; BA0 = 1, BA1 =1, BA2 = 0 select extended mode register 3; other combinations of BA0-BA2 are
reserved). A0-A12 provide the op-code to be written to the selected mode register.
3) BA0-BA2 provide bank address and A0 A11 provide row address.
4) BA0-BA2 provide bank address; A0-A7 and A9 provide column address; A8 HIGH enables the auto precharge
feature (nonpersistent), and A8 LOW disables the auto precharge feature.
5) A8 LOW: BA0-BA2 determine which bank is precharged.
A8 HIGH: all banks are precharged and BA0-BA2 are “Don’t Care.”
6) Internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for CKE#.
7) DESELECT and NOP are functionally interchangeable.
8) Used for bus snooping when the DQ termination is set to ZQ/2 in the EMRS and cannot be used during power-down
or self refresh.
9) The decode of the DESELECT command excludes the DATA TERMINATOR DISABLE command.
10) Address is received on two consecutive rising edges of CK
Table 7 Truth Table - DM Operations
FUNCTION DM DQ NOTES
Write Enable L Valid 1
Write Inhibit H X
1
Notes: 1) Used to mask write data, provided coincident with the corresponding data.
Rev. 1.2 /June. 2008
18