NEC UPD98413 User Manual page 23

Pin Name Serial No.
TFCLK
TDAT [31:0]
TSOP
TENB_B
TPRTY
TEOP
TMOD[1:0]
TERR
CHAPTER 2 PIN FUNCTION
Address No. I/O Level
I
LVTTL
I
LVTTL
I
LVTTL
I
LVTTL
I
LVTTL
I
LVTTL
I
LVTTL
I
LVTTL
PRELIMINARY
Function
Transmit FIFO write clock.
Clock signal at up to 104 MHz supplied from the POS device.
All signal operations in the data transfer of the transmission
interface are executed in synchronization with this clock signal.
Transmit packet data bus.
32-bit data bus for inputting transmit packets. Transmit data is
input at a rising edge of TFCLK.
If TSX is high at the start of transfer, TDAT[7:0] is used to
specify the port address.
Transmit start of packet.
Signal indicating the start position of a transmit packet.
When TSOP is high, the data on TDAT is assumed to be
the beginning of a packet.
Transmit write enable.
Indicates whether the transmit data (TDAT) and other
signals are valid. When TENB_B is low, the TDAT,
TMOD, TSOP, TEOP, TERR, and TPRTY signals are
valid. TSX is valid when TENB_B is high.
Transmit bus parity.
Signal for inputting the odd or even parity for the data to be
input to TDAT. Upon detecting a parity error, the
uPD98413 reports it with an interrupt. Even if a parity error
is detected, data transfer continues without being affected.
Transmit end of packet.
Signal indicating the end position of a transmit packet.
When TEOP is high, the data on TDAT is assumed to be
the end of a packet, and the effective bytes of the last
word are indicated by TMOD.
Transmit word modulo.
Signal indicating the effective bytes of the last word TDAT
of a transmit packet. TMOD is valid when TEOP is high.
When TMOD[1:0] is equal to 00, TDAT[31:0] is effective.
When TMOD[1:0] is equal to 01, TDAT[31:8] is effective.
When TMOD[1:0] is equal to 10, TDAT[31:16] is effective.
When TMOD[1:0] is equal to 11, TDAT[31:24] is effective.
Transmit error.
Signal for aborting a packet being transferred. When
TERR goes high, the packet being transferred is sent as
an abort packet. TERR and TEOP must be asserted at
the same time.
NEC confidential and Proprietary
(3/4)
23