Pos Interface; Signals - NEC UPD98413 User Manual

4.3 POS Interface

The POS interface transfers transmit and receive packet data to the POS device. The features of this interface
are as follows:
• Compliant with POS-PHY
• 32-bit, 104 MHz LVTTL FIFO interface.
• Supports direct status indication and status poling for the transmit interface.
• Executes a parity check on transmit data, generates and outputs a parity bit of receive data.
• Selectable FIFO threshold condition for Transmit Packet Available (TPA) signal indicating an available area of
transmit FIFO for each port.
• 1K bytes transmit and receive FIFOs for each port.

4.3.1 Signals

An example of connecting the POS interface is shown below.
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CHAPTER 4 INTERFACES
TM
Level3 issue 4.
Figure 4-13. Example of Connecting the POS Interface
RFCLK
RENB_B
RXDAT[31:0]
RMOD[1:0]
RPRTY
RVAL
uPD98413
RSOP
REOP
RERR
RSX
TFCLK
TENB_B
TDAT[31:0]
TMOD[1:0]
TPRTY
TSOP
TEOP
TERR
TSX
DTPA0/PTPA
DTPA1-3
STPA
TADR[1:0]
PRELIMINARY
POS device
NEC confidential and Proprietary