NEC UPD98413 User Manual page 25

Pin Name Serial No.
DTPA[3:0]
STPA
PTPA
TADR[1:0]
CHAPTER 2 PIN FUNCTION
Address No. I/O Level
O
LVTTL
O
LVTTL
O
LVTTL
I
LVTTL
PRELIMINARY
Function
Direct transmit packet available.
In direct status indication, the signal indicating the status
of the corresponding port. When high, DTPA indicates
that the transmission FIFO has an enough free space and
is capable of data transfer. When low, DTPA indicates
that the transmission FIFO is full (or almost full) and is not
capable of data transfer. The high/low transition of DTPA
(transmission FIFO status) is programmable.
Selected port transmit packet available.
Signal indicating the status of the selected port. When
high, STPA indicates that the transmission FIFO has
enough free space and is capable of data transfer. When
low, STPA indicates that the transmission FIFO is full (or
almost full) and is not capable of data transfer. The
high/low transition of STPA (transmission FIFO status) is
programmable.
Polled port transmit packet available.
In status polling, signal indicating the status of the polled
port. It indicates the status of the port selected by TADR.
When high, PTPA indicates that the transmission FIFO
has enough free space and is capable of data transfer.
When low, PTPA indicates that the transmission FIFO is
full (or almost full) and is not capable of data transfer. The
high/low transition of PTPA (transmission FIFO status) is
programmable.
Transmit port address.
Signal for specifying the address of the port to be polled to
obtain the status of the transmission FIFO (full/not full).
The transmission FIFO status for the port specified by
TADR is reported by PTPA at the next clock pulse.
NEC confidential and Proprietary
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