PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 64

• Manufacturer Part Number: PM5381-BI
• Description: ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
Pin Name
TENB
(continued)
TCA
DTPA
TEOP
Type
Input
Output
Input
Pin
No.
A19
D17
B16
Function
The POS-PHY transmit write enable (TENB) signal is an
active low input which is used to initiate writes to the transmit
FIFOs.
When TENB is sampled high, the information sampled on the
TDAT[31:0], TPRTY, TSOP, TEOP, TMOD[1:0], and TERR
signals is invalid. When TENB is sampled low, the
information sampled on the TDAT[31:0], TPRTY, TSOP,
TEOP, TMOD[1:0], and TERR signals is valid and is written
into the transmit FIFO.
TENB is sampled on the rising edge of TFCLK.
The UTOPIA transmit cell available (TCA) signal provides
direct status indication of when cell space is available in the
transmit FIFO.
When set high, TCA indicates that the corresponding transmit
FIFO is not full and a complete cell may be written. TCA is
set low to indicate either that the transmit FIFO is full.
TCA is updated on the rising edge of TFCLK.
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 level DTPA is set to indicate
"full", the transmit packet processors still have full FIFO
capacity to store data. When DTPA transitions high, it
indicates that the transmit FIFO has enough room to store a
configurable number of data bytes.
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.
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 1, 2, 3, or
4 byte packets. TEOP is only valid when TENB is
simultaneously asserted.
TEOP is only used for POS-PHY operation and is sampled on
the rising edge of TFCLK.
S/UNI-2488 Telecom Standard Product Datasheet
Released
64