PC SGRAM Specification
12
Revision 0.9
NOTES:
1. H: High Level, L: Low Level, X: don’t care, V: Valid data input, BA: Bank Address, AP: (Auto Precharge), CA:
(Column Address), RA: (Row Address)
2. All entries assume that CKE was active (high level) during the preceding clock cycle.
3. If both banks are idle and CKE is inactive (low level), then in power down mode.
4. Illegal to bank in specified states. Function may be legal in the bank indicated by Bank Address (BA),
depending on the state of that bank.
5. If both banks are idle and CKE is inactive (low level), then Self refresh mode.
6. Illegal if trcd is not satisfied.
7. Illegal if tras is not satisfied.
8. Must satisfy burst interupt condition.
9. Must satisfy bus contention, bus turn around, and/or write recovery requirements.
10.Must mask preceding data which don’t satisfy tdpl.
11.Illegal if trrd is not satisfied.
12.Burst Stop command is disabled.
13.Ilegal for single bank, but legal for other banks in multi-bank devices.
14.Illegal for all banks.
Mode
Register
accessing
HXXXXX DSEL
NOP - Enter
idle after tmrd
LHHHL X NOP
NOP - Enter
idle after tmrd
LHLXXX
READ/ WRITE/
READAP/
WRITEAP/
BLKWR
ILLEGAL 14
LHHLLX BST ILLEGAL
LLXXXX
ACT/PRE/
PALL/ CBR/
SELF/MRS/
SMRWR
ILLEGAL 14
Table 7. Operative Command Table
Current
state
CS# RAS# CAS# WE# DSF Address Command Action Notes
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