PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
Function
Pin Name
Type
Pin
No.
D17
The POS-PHY direct transmit packet available (DTPA) signal
provides status indication on the fill status of the transmit FIFO.
Note that regardless of what fill level DTPA is set to indicate "full"
at, the transmit packet processors still have the full capacity of
its FIFO to store cells. When DTPA transitions high, it indicates
that the transmit FIFO has enough room to store a configurable
number of data bytes.
DTPA
Output
When DTPA transitions low, it indicates that the transmit FIFO is
either full or near full as configured.
DTPA is updated on the rising edge of TFCLK.
B16
The POS-PHY transmit end of packet (TEOP) signal marks
the end of packet on the TDAT[31:0] bus when configured for
packet data. The TEOP signal marks the last word of a packet
on the TDAT[31:0] bus. The TMOD[1:0] signal indicates how
many bytes are in the last word. It is legal to set TSOP high at
the same time as TEOP high in order to support one, two, three,
or four byte packets. TEOP is only valid when TENB is
simultaneously asserted.
TEOP
Input
TEOP is only used for POS operation and is sampled on the
rising edge of TFCLK.
The POS-PHY transmit error (TERR) signal is used to indicate
that the current packet must be aborted. Packets marked with
TERR will have the abort sequence appended when transmitted.
TERR should only be asserted during the last word of the packet
being transferred on TDAT[31:0].
TERR
Input
A17
TERR is only considered valid when TENB and TEOP are
simultaneously asserted.
TERR is ignored for the UTOPIA mode of operation and is
sampled on the rising edge of TFCLK.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
36
PMC [ PMC-SIERRA, INC ]
