W989D6CB Datasheet, PDF (57/67 Pages) Winbond – 512Mb Mobile LPSDR

W989D6CB / W989D2CB
10.17 Auto Precharge Timing (Read Cycle)
512Mb Mobile LPSDR
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 Activate command.
When the Auto precharge command is asserted, the period from Bank Activate command to
the start of internal precgarging must be at least tRAS (min).
“Dn” = Write data, and “Qn” = Read data
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Publication Release Date: Sep, 22, 2011
Revision A01-005