IDT70T3519/99/89S
High-Speed 2.5V 256/128/64K x 36 Dual-Port Synchronous Static RAM
Industrial and Commercial Temperature Ranges
Timing Waveform of Left Port Write to Pipelined Right Port Read
CLK "A"
(1,2,4)
R/ W "A"
t SW
t SA
t HW
t HA
ADDRESS "A"
DATA IN"A"
MATCH
t SD
t HD
VALID
NO
MATCH
t CO (3)
CLK "B"
t CD2
R/ W "B"
t SW
t SA
t HW
t HA
ADDRESS "B"
DATA OUT"B"
MATCH
NO
MATCH
VALID
NOTES:
t DC
5666 drw 09
1. CE 0 , BE n , and ADS = V IL ; CE 1 , CNTEN , and REPEAT = V IH .
2. OE = V IL for Port "B", which is being read from. OE = V IH for Port "A", which is being written to.
3. If t CO < minimum specified, then data from Port "B" read is not valid until following Port "B" clock cycle (ie, time from write to valid read on opposite port will be
t CO + 2 t CYC2 + t CD2 ). If t CO > minimum, then data from Port "B" read is available on first Port "B" clock cycle (ie, time from write to valid read on opposite port
will be t CO + t CYC2 + t CD2 ).
4. All timing is the same for Left and Right ports. Port "A" may be either Left or Right port. Port "B" is the opposite of Port "A"
Timing Waveform with Port-to-Port Flow-Through Read
CLK "A"
(1,2,4)
R/ W "A"
t SW
t SA
t HW
t HA
ADDRESS "A"
DATA IN "A"
MATCH
t SD
t HD
VALID
t CO
(3)
NO
MATCH
CLK "B"
t CD1
R/ W "B"
t SW
t SA
t HW
t HA
ADDRESS "B"
MATCH
NO
MATCH
t CD1
DATA OUT "B"
NOTES:
t DC
VALID
t DC
VALID
5666 drw 10
1. CE 0 , BE n, and ADS = V IL ; CE 1 , CNTEN , and REPEAT = V IH .
2. OE = V IL for the Right Port, which is being read from. OE = V IH for the Left Port, which is being written to.
3. If t CO < minimum specified, then data from Port "B" read is not valid until following Port "B" clock cycle (i.e., time from write to valid read on opposite port will be
t CO + t CYC + t CD1 ). If t CO > minimum, then data from Port "B" read is available on first Port "B" clock cycle (i.e., time from write to valid read on opposite port will
be t CO + t CD1 ).
4. All timing is the same for both left and right ports. Port "A" may be either left or right port. Port "B" is the opposite of Port "A".
15
6.42
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