Rainbow Electronics W9864G2GH - Manual (Page 39)

W9864G2GH
Publication Release Date: August 16 ,2006
- 39 - Revision A01
Operating Timing Example, continued
14.16 Auto-precharge Timing (Read Cycle)
Read AP
0 11 10 9 8 7 6 5 4 3 2 1
Q0
Q0
Read AP Act
Q1
Read AP Act
Q1 Q2
AP Act Read
Act
Q0
Q3
(1) CAS
Latency=2
Read
Act
AP
When the Auto precharge command is asserted, the period from Bank Activate command to
the start of internal precgarging must be at least t RAS (min).
represents the Read with Auto precharge command.
represents the start of internal precharging.
represents the Bank Activate command.
Note:
t RP
t RP
t RP
( a ) burst length = 1
Command
( b ) burst length = 2
Command
( c ) burst length = 4
Command
( d ) burst length = 8
Command
DQ
DQ
DQ
DQ
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
t RP
Q0
Read AP Act
Q0
Read AP Act
Q1
Q0
Read AP Act
Q1 Q2 Q3
Read AP Act
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
(2) CAS
Latency=3
t RP
t RP
t RP
t RP
( a ) burst length = 1
Command
( b ) burst length = 2
Command
( c ) burst length = 4
Command
( d ) burst length = 8
Command
DQ
DQ
DQ
DQ