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Timing Diagrams
278
NS7520 Hardware Reference, Rev. D 03/2006
SRAM OE burst read
OE* controlled, four word (3-2-2-2), burst read (wait = 2, BCYC = 01)
Notes:
1 At least one null period occurs between memory transfers. More null periods can
occur if the next transfer is DMA. Thirteen clock pulses are required for DMA
context switching.
2 Port size determines which byte enable signals are active:
– 8-bit port = BE3*
– 16-bit port = BE[3:0]
– 32-bit port = BE[3:0]
3 The TW cycles are present when the WAIT field is set to 2 or more.
4 The TA* and TEA*/LAST signals are for reference only.
T1 TW T2 TW T2 TW T2 TW T2 Note-1 T1
12
1818
2828
2727
3636
6
3131
3030
11
10
BCLK
TA* (Note-4)
TEA*/LAST (Note-4)
A[27:0]
BE[3:0]* (Note-2)
CS[4:0]*
read D[31:0]
Async OE*
CS0OE*
RW*