PM5357 datasheet(49/432 Pages) PMC

49 / 432 page

PRODUCTION

S/UNI-622-POS

PMC-Sierra, Inc.

PM5357

S/UNI-622-POS

DATASHEET

PMC-1980911

ISSUE 5

SATURN USER NETWORK INTERFACE (622-POS)

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

Pin Name

Type

No.

Function

TCA

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 either indicate that the

transmit FIFO is near full or that the transmit FIFO is

full. To reduce FIFO latency, the FIFO depth at which

TCA indicates "full" can be set to one, two, three or

four cells. Note that regardless of what fill level TCA

is set to indicate "full" at, the transmit cell processor

can store 4 complete cells.

In 16-bit Level 2 ATM mode, TCA will transition low

one TFCLK cycle after the payload word 19 or 23

(depending of the configuration in TXCP) is sampled

on the TDAT[15:0] bus.

In 8-bit Level 3 ATM mode, TCA will transition low on

the rising edge of TFCLK before the payload byte 45

is sampled on the TDAT[7:0] bus.

TCA is updated on the rising edge of TFCLK.

TPA

Output

L23

The POS-PHY transmit packet available (TPA) signal

provides direct status indication the fill status of the

transmit FIFO. Note that regardless of what fill level

TPA is set to indicate "full" at, the transmit packet

processor can store 256 bytes of data.

When TPA transitions high, it indicates that the

transmit FIFO has enough room to store a

configurable number of data bytes. This transition

level is selected in the TXFP registers.

When TPA transitions low, it indicates that the

transmit FIFO is either full or near full as specified by

the TXFP registers.

TPA is updated on the rising edge of TFCLK.

PM5357 Datasheet(PDF) 49 Page - PMC-Sierra, Inc

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