CHAPTER 2 PIN FUNCTION
PRELIMINARY
NEC confidential and Proprietary
28
(2/2)
Pin Name
Serial No.
Address No.
I/O Level
Function
ROHCK0-3
O
LVTTL
Receive overhead interface clock output (19.44 MHz)
This pin outputs the 19.44-MHz clock obtained by internally
dividing receive clock RCLK (622.08 MHz) by 32. RTOHFP,
RPOHFP and ROHAV are output in sync with this divided
clock.
RTOHFP0-3
O
LVTTL
Receive TOH frame pulse output.
This signal goes high coincident with the clock cycle in
which output of the receive TOH data is started.
RPOHFP0-3
O
LVTTL
Receive POH frame pulse output.
This signal goes high coincident with the clock cycle in
which output of receive POH data is started.
ROHD[1:0]0-3
O
LVTTL
Receive TOH / POH data output 2-bit bus.
This 2-bit bus outputs receive TOH / POH data. It starts
output of the receive TOH / POH onto ROHD starting from
the clock cycle at the same time RTOHFP is output.
ROHAV0-3
O
LVTTL
Receive TOH / POH validity indication signal output.
This signal indicates that valid receive TOH data is output to
ROHD. In the clock cycle in which valid data is output to
ROHD, ROHAV goes high. In the clock cycle in which valid
data is not output, ROHAV goes low.
Содержание UPD98413
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