NEC UPD98413 User Manual page 130

TERR
Transmit error.
(input):
TERR is used to indicate that there is an error in the current packet. TERR must be asserted
when TEOP is asserted. When TERR goes high, the current packet is sent as an abort packet.
TERR is considered valid only when TENB_B is asserted.
TSX (input): Transmit start of transfer.
TSX indicates when the in-band port address is presented on the TDAT bus. When TSX is
high and TENB_B is high, the port used to start transfer can be selected with the port address
input to TDAT[7:0]. TSX is considered valid only when TENB_B is not asserted.
The in-band port address specified the port can be set any value by the IADRT register. By
default, the following addresses show the corresponding ports.
0: port0, 1: port1, 2: port2, 3: port3
DTPA0-3 Direct transmit packet available.
DTPA provides direct status indication for the corresponding ports in the µPD98413 port.
(output):
DTPA0 corresponds to the port0, DTPA3 corresponds to the port3. DTPA0-3 are used in the
direct status indication mode.
DTPA transitions high when a predefined minimum number of bytes is available in the transmit
FIFO. When DTPA transitions low, it indicates that the transmit FIFO is almost full.
DTPA is updated on the rising edge of TFCLK.
STPA Selected port transmit packet available.
(output):
STPA always provides status indication for the selected port. The port which STPA reports is
updated on the following rising edge of TFCLK after the µPD98413 samples the in-band port
address on TDAT.
STPA transitions high when a predefined minimum number of bytes is available in the transmit
FIFO. When STPA transitions low, it indicates that the transmit FIFO is almost full.
STPA is updated on the rising edge of TFCLK.
PTPA
Polled port transmit packet available.
(output): PTPA allows the polling of the port selected by the TADR[1:0]. The port which PTPA reports is
updated on the following rising edge of TFCLK after the µPD98413 samples the in-band port
address on TDAT. PTPA is used in the status polling mode.
PTPA transitions high when a predefined minimum number of bytes is available in the transmit
FIFO. When STPA transitions low, it indicates that the transmit FIFO is almost full.
PTPA is updated on the rising edge of TFCLK.
TADR[1:0] Transmit port address.
(input):
TADR[1:0] is used with the PTPA signal to poll the transmit FIFO's packet available status.
TADR[1:0] is used in the status polling mode.
When the µPD98413 samples TADR[1:0] on the rising edge of TFCLK, the PTPA signal is
updated with the status of the port specified by TADR[1:0] on the following rising edge of
TFCLK. The following addresses show the corresponding ports.
0: port0, 1: port1, 2: port2, 3: port3
130
CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary