CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
128
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
TM
Level3 issue 4.
•
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.
Figure 4-13. Example of Connecting the POS Interface
RFCLK
RENB_B
RXDAT[31:0]
RMOD[1:0]
RPRTY
RVAL
RSOP
REOP
RERR
RSX
uPD98413 POS
device
TFCLK
TENB_B
TDAT[31:0]
TMOD[1:0]
TPRTY
TSOP
TEOP
TERR
TSX
DTPA0/PTPA
DTPA1-3
STPA
TADR[1:0]
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