PM5352 datasheet(21/77 Pages) PMC

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PM5352 S/UNI STAR

DATA SHEET

PMC-1990421

ISSUE 2

SATURN USER NETWORK INTERFACE 155 (STAR)

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pin Name

Type

No.

Function

TSOP

Input

(POS)

J21

POS-PHY Transmit Start of Packet (TSOP) signals.

TSOP indicates the first word of a packet. TSOP is

required to be present at the beginning of every

packet for proper operation.

TSOP is considered valid only when TENB is

simultaneously asserted and the S/UNI-STAR is

selected via TADR[2:0].

TSOP is sampled on the rising edge of TFCLK.

TENB

Input

(ATM)

J22

UTOPIA Transmit Multi-PHY Write Enable (TENB)

signal.

The TENB signal is an active low input which is

used along with the TADR[2:0] inputs to initiate

writes to the transmit FIFO’s.

TENB works as follows. When sampled high, no

write is performed, but the TADR[2:0] address is

latched to identify the transmit FIFO to be

accessed. When TENB is sampled low, the word on

the TDAT bus is written into the transmit FIFO that

is selected by the TADR[2:0} address bus. A

complete 53 octet cell must be written to the

transmit FIFO before it is inserted into the transmit

stream. Idle cells are inserted when a complete cell

is not available. While TENB is deasserted,

TADR[2:0] can be used for polling TCA.

TENB is sampled on the rising edge of TFCLK.

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