Rainbow Electronics W982516CH - Manual (Page 34)

W982516CH
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Operating Timing Example, continued
Autoprecharge 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
( 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
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