Frame Pulse Input Pins; General-Purpose I/O Port - NEC UPD98413 User Manual

2.2.6 Frame Pulse input pins

Pin Name Serial No.
TFPI

2.2.7 General-Purpose I/O Port

Pin Name Serial No.
PIO[7:0]
30
CHAPTER 2 PIN FUNCTION
Address No. I/O Level
I
LVTTL
Address No. I/O
I/O
LVTTL
PRELIMINARY
Function
Frame pulse input.
The active high framing position (TFPI) signal is used to
align the SONET/SDH transport frame generated by the
µ
PD98413 device to a system reference.
TFPI must be tied low if such synchronization is not
required.
Function
General-purpose input/output port.
These are general-purpose input or output pins that input
or output the state signals of external peripheral devices.
It is possible to change to input or output with the
MDDGEN register GPIOM[7:0] bit setting.
General-purpose input
The signal levels of these pins are reflected on the bits of
the internal GPIN register. Changes in the statuses of these
bits can be used as interrupt causes.
General-purpose output
The settings of the bits of the internal GPOUT register are
output to these pins as signal levels. These pins can be
used to control external peripheral devices.
NEC confidential and Proprietary