
IDT70T3719/99M
High-Speed 2.5V 256/128K x 72 Dual-Port Synchronous Static RAM
Industrial and Commercial Temperature Ranges
Timing Waveform of Pipelined Read with Address Counter Advance
t CYC2
(1)
CLK
t CH2
t CL2
t SA
t HA
ADDRESS
ADS
CNTEN
An
t SAD t HAD
t CD2
t SAD t HAD
t SCN t HCN
DATA OUT
Qx - 1 (2)
Qx
Qn
Qn + 1
Qn + 2 (2)
Qn + 3
,
t DC
READ
EXTERNAL
ADDRESS
READ WITH COUNTER
COUNTER
HOLD
READ
WITH
COUNTER
5687 drw 15
Timing Waveform of Flow-Through Read with Address Counter Advance
t CYC1
(1)
CLK
t CH1
t CL1
t SA
t HA
ADDRESS
ADS
An
t SAD t HAD
t SAD t HAD
t SCN t HCN
CNTEN
t CD1
DATA OUT
Qx (2)
Qn
Qn + 1
Qn + 2
Qn + 3 (2)
Qn + 4
,
t DC
READ
EXTERNAL
ADDRESS
READ WITH COUNTER
COUNTER
HOLD
READ
WITH
COUNTER
5687 drw 16
NOTES:
1. CE 0 , OE , BE n = V IL ; CE 1 , R/ W , and REPEAT = V IH .
2. If there is no address change via ADS = V IL (loading a new address) or CNTEN = V IL (advancing the address), i.e. ADS = V IH and CNTEN = V IH , then
the data output remains constant for subsequent clocks.
16
6.42