Intel 740 - 4 Command Truth Table

Revision 0.9
7
PC SGRAM Specification
4.0 Command Truth Table
NOTE: H: High Level, L: Low Level, X: don’t care, V: Valid data input
Table 5. Command Truth Table
Function Symbol Command & Address
CS# RAS# CAS# WE# DSF
A8/
A9
DQM A[7:0]
BA0,
BA1
Mode Register
Write
MRS LL LLLxx
Data for
Mode
Register.
x
Special Mode
Register Write
SMRWR L L L L H x x
Data for
SMR
x
CBR Refresh CBR L L L H L x x x x
Activate (Single
Bank)
ACT L L H H L x v
Row
Address
Bank
Address
Block Write BLKWR L H L L H x v
Column
Address
Bank
Address
Write WRITE LHLLLxv
Column
Address
Bank
Address
Write with Auto-
precharge
WRITEAP L H L L L H v
Column
Address
Bank
Address
Read READ L H L H L L x
Column
Address
Bank
Address
Read with Auto-
precharge
READAPLH LHLHx
Column
Address
Bank
Address
Burst Stop BST L H H L L x x x x
Precharge select
Bank
PRE LLHLLLx x
Bank
Address
Precharge All
Banks
PA L L L L H L L H x x x
No Operation NOP L H H H L x x x x
Device DeselectDSEL Hx xxxxx x x
Table 6. DQM Truth Table
Function
CKE
n-1
CKE
n
DQMx
Data write/output enable H X L
Data mask/output disable H X H
Byte x write mask H X H