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CY7C43644 Datasheet, PDF (23/39 Pages) Cypress Semiconductor – 1K/4K x36 x2 Bidirectional Synchronous FIFO with Bus Matching
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Switching Waveforms (continued)
Port B Word Read Cycle Timing for FIFO1 (CY Standard and FWFT Modes)[1, 37]
CLKB
EFB/ORB
CSB
W/RB[33]
MBB
ENB
B0–17
(Standard Mode)
OR
B0–17
(FWFT Mode)
tENS tENH
tEN
tMDV
tEN
tMDV
tA
Previous
tA
Read 1
tA
Read 1
tA
Read 2
CY7C43644
CY7C43664
CY7C43684
No Operation
tDIS
Read 2
tDIS
Read 3
Port B Byte Read Cycle Timing for FIFO1 (CY Standard and FWFT Modes)[1, 36]
CLKB
EFB/ORB
CSB
W/RB[33]
HIGH
MBB
ENB
B0–8
(Standard Mode)
OR
B0–8
(FWFT Mode)
tENStENH
tEN tMDV
tEN tMDV
tA
Previous
tA
Read 1
tA
Read 1
tA
Read 2
tA
Read 2
tA
Read 3
tA
Read 3
tA
Read 4
No OperationtDIS
Read 4
tDIS
Read 5
Notes:
36. Unused word B18–35 contains all zeroes for word-size reads.
37. Unused bytes B9–17, B18–26, and B27–35 contain all zeroes for byte-size reads.
Document #: 38-06022 Rev. *B
Page 23 of 39
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