CY7C9689 Datasheet, PDF (31/48 Pages) Cypress Semiconductor – TAXI Compatible HOTLink Transceiver

CY7C9689 HOTLink Receiver Switching Waveforms
Read Cycle
Asynchronous (FIFO) Interface
EXTFIFO=HIGH
FIFOBYP=HIGH
RXCLK
RXEN
t_RXENS
READ
RXEMPTY
Note 36
LFI
RXFULL
RXHALF
RXDATA[7:0]
RXDATA[9:8/RXCMD[2:3]
RXCMD[1:0]
t_RXCLKOP
t_RXCLKIP
t_RXCLKOD
t_RXCLKOD
t_RXCPWH
t_RXCPWL
t_RXENH
t_RXA
NO OPERATION
t_RXA
FIFO EMPTY
VALID DATA
Note 37
CE
CY7C9689
READ
Read Cycle
Asynchronous (FIFO) Interface
EXTFIFO=LOW
FIFOBYP=HIGH
RXCLK
RXEN
t_RXENS
READ
RXEMPTY
LFI
RXFULL
RXHALF
RXDATA[7:0]
RXDATA[9:8/RXCMD[2:3]
RXCMD[1:0]
CE
t_RXENH
t_RXA
VALID DATA
t_RXA
FIFO EMPTY
Note 38
Notes:
36. When transferring data from the Receive FIFO to a depth expanded external FIFO, the data is sent to the external FIFO on the same clock cycle that
RXEN=HIGH. RXEMPTY=LOW indicates that data is available.
37. On inhibited reads, or if the Receive FIFO goes empty, the data outputs do not change.
38. When reading data from synchronous data interface, the data is captured on any clock cycle that RXEN=LOW. RXEMPTY=HIGH indicates data is available.
RXEMPTY=LOW indicates that the FIFO is empty.
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