W989D6DB Datasheet, PDF (56/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
11.17 Auto-precharge Timing (Read Cycle)
0
1
2
3
4
5
6
7
8
9
10 11
(1) CAS Latency=2
( a ) burst length = 1
Command _{Read AP}
Act
tRP
DQ
Q0
( b ) burst length = 2
Command
Read
AP
Act
tRP
DQ
Q0 Q1
( c ) burst length = 4
Command
DQ
Read
AP
Act
tRP
Q0 Q1 Q2 Q3
( d ) burst length = 8
Command
DQ
Read
AP
Act
tRP
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
(2) CAS Latency=3
( a ) burst length = 1
Command
Read
AP
DQ
Act
tRP
Q0
( b ) burst length = 2
Command
Read
DQ
AP
Act
tRP
Q0 Q1
( c ) burst length = 4
Command
DQ
Read
AP
Act
tRP
Q0 Q1 Q2 Q3
( d ) burst length = 8
Command
Read
DQ
AP
Act
tRP
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Note:
Read
represents the Read with Auto precharge command.
AP
represents the start of internal precharging.
Act
represents the Bank Activ ate command.
When the Auto precharge command is asserted, the period f rom Bank Activ ate command to
the start of internal precgarging must be at leastRtAS (min).
- 56 -
Publication Release Date: Mar. 19, 2014
Revision: A01-001