CY7C43643 CYPRESS [Cypress Semiconductor], CY7C43643 Datasheet - Page 24

• Manufacturer Part Number: CY7C43643
• Description: 1K/4K/16K x36 Unidirectional Synchronous FIFO with Bus Matching
• Manufacturer: CYPRESS [Cypress Semiconductor]

Document #: 38-06021 Rev. *B
Switching Waveforms
Notes:
36. FIFO Write (CSA = LOW, W/RA = HIGH, MBA = LOW), FIFO Read (CSB = LOW, W/RB = HIGH, MBB = LOW). Data in the FIFO output register has been read
37. D = Maximum FIFO Depth 1K for the CY7C43643, 4K for the 43663, and 16K for the CY7C43683.
38. If Port B size is word or byte, t
39. t
40. FIFO Write (CSA = LOW, W/RA = LOW, MBA = LOW), FIFO Read (CSB = LOW, W/RB = HIGH, MBB = LOW). Data in the FIFO output register has been read
41. If Port B size is word or byte, AE is set LOW by the last word or byte read from FIFO, respectively.
42. t
Timing for AE when FIFO is Almost Empty (CY Standard and FWFT Modes)
AE
ENB
CLKA
ENA
CLKB
AF
CLKB
ENB
Timing for AF when FIFO is Almost Full (CY Standard and FWFT Modes)
CLKA
ENA
from the FIFO.
CLKA edge and rising CLKB edge is less than t
from the FIFO.
CLKA edge and rising CLKB edge is less than t
SKEW2
SKEW2
is the minimum time between a rising CLKA edge and a rising CLKB edge for AF to transition HIGH in the next CLKA cycle. If the time between the rising
is the minimum time between a rising CLKA edge and a rising CLKB edge for AE to transition HIGH in the next CLKB cycle. If the time between the rising
[D–(Y1+1)] Words in FIFO1
X1 Word in FIFO
t
ENS
t
SKEW2
ENS
(continued)
is referenced to the rising CLKB edge that writes the last word or byte of the long word, respectively.
(X1+1) Word in FIFO
t
PAF
t
SKEW2
t
ENH
t
SKEW2
SKEW2
ENH
[42]
, then AF may transition HIGH one CLKB cycle later than shown.
, then AE may transition HIGH one CLKB cycle later than shown.
(D–Y1)Words in FIFO1
t
ENS
t
t
SKEW2
ENH
[39]
t
PAE
[2, 36, 37, 38]
[40, 41, 2]
(X1+1)Words in FIFO
t
PAF
t
ENS
CY7C43643
CY7C43663
CY7C43683
t
t
ENH
PAE
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