CY7C9689
CY7C9689 HOTLink Receiver Switching Waveforms
Read Cycle
Asynchronous (FIFO) Interface
EXTFIFO=HIGH
t
t
RXCLKOP
FIFOBYP=HIGH
RXCLKIP
t
t
t
RXCLKOD
RXCLKOD
t
RXCPWH
RXCPWL
RXCLK
t
t
RXENH
RXENS
RXEN
NO OPERATION
READ
READ
t
t
RXA
RXA
36
Note
RXEMPTY
FIFO EMPTY
LFI
RXFULL
RXHALF
RXDATA[7:0]
37
Note
VALID DATA
RXDATA[9:8/RXCMD[2:3]
RXCMD[1:0]
CE
Read Cycle
Asynchronous (FIFO) Interface
EXTFIFO=LOW
FIFOBYP=HIGH
RXCLK
t
RXENS
t
RXENH
READ
RXEN
t
t
RXA
RXA
FIFO EMPTY
RXEMPTY
LFI
RXFULL
RXHALF
RXDATA[7:0]
38
Note
VALID DATA
RXDATA[9:8/RXCMD[2:3]
RXCMD[1:0]
CE
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.
31
CYPRESS [ CYPRESS ]
