Rainbow Electronics W9864G2GH - Manual (Page 38)

W9864G2GH
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Operating Timing Example, continued
14.15 Auto-precharge Timing (Write Cycle)
Act
0 1 3 2
(1) CAS Latency = 2
(a) burst length = 1
DQ
4 5 7 6 8 9 11 10
Write
D0
Act AP Command
(b) burst length = 2
DQ
Write
D0
Act AP Command
tRP
tRP
D1
(c) burst length = 4
DQ
Write
D0
Act AP Command
tRP
D1
(d) burst length = 8
DQ
Write
D0
Act AP Command
tRP
D1
D2 D3
D2 D3 D4 D5 D6 D7
(2) CAS Latency = 3
(a) burst length = 1
DQ
Write
D0
Act AP
Command
(b) burst length = 2
DQ
Write
D0
Act AP Command
tRP
tRP
D1
(c) burst length = 4
DQ
Write
D0
Act AP Command
tRP
D1
(d) burst length = 8
DQ
Write
D0
AP Command
tRP
D1
D2 D3
D2 D3 D4 D5 D6 D7
tWR
tWR
tWR
tWR
tWR
tWR
tWR
tWR
12
Act
represents the Write with Auto precharge command.
represents the start of internal precharing.
represents the Bank Active command.
Write
AP
Act Act
When the /auto precharge command is asserted,the period from Bank Activate
command to the start of intermal precgarging must be at least tRAS (min).
Note )
CLK