PM5356 datasheet(37/307 Pages) PMC

37 / 307 page

RELEASED

S/UNI-622-MAX

PMC-Sierra, Inc.

PM5356

S/UNI-622-MAX

DATASHEET

PMC-1980589

ISSUE 6

SATURN USER NETWORK INTERFACE (622-MAX)

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

Pin Name

Type

No.

Function

TCA

Output

L23

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.

RFCLK

Input

M21

The UTOPIA receive FIFO read clock (RFCLK).

RFCLK is used to read ATM cells from the four cell

receive FIFO.

When in 16-bit Level 2 ATM mode, RFCLK must cycle

at a 50 MHz to 40 MHz instantaneous rate, and must

be a free running clock (cannot be gapped).

When in 8-bit Level 3 ATM mode, RFCLK must cycle

at a 100 MHz to 60 MHz instantaneous rate, and

must be a free running clock (cannot be gapped).

PM5356 Datasheet(PDF) 37 Page - PMC-Sierra, Inc

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