NEC UPD98413 User Manual page 28

Pin Name Serial No.
ROHCK0-3
RTOHFP0-3
RPOHFP0-3
ROHD[1:0]0-3
ROHAV0-3
28
CHAPTER 2 PIN FUNCTION
Address No. I/O Level
O
LVTTL
O
LVTTL
O
LVTTL
O
LVTTL
O
LVTTL
PRELIMINARY
Function
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.
Receive TOH frame pulse output.
This signal goes high coincident with the clock cycle in
which output of the receive TOH data is started.
Receive POH frame pulse output.
This signal goes high coincident with the clock cycle in
which output of receive POH data is started.
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.
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.
NEC confidential and Proprietary
(2/2)