PM7346 datasheet(65/419 Pages) PMC

65 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 44

Pin Name

Type

Pin No.

Function

TCA

Output

H19

Transmit Multi-Phy Cell Available (TCA).

The TCA signal indicates when a cell is

available in the transmit FIFO for the port

selected by TADR[4:0]. When high, TCA

indicates that the corresponding transmit

FIFO is not full and a complete cell may be

written. When TCA goes low, it can be

configured to indicate either that the

corresponding transmit FIFO is near full or

that the corresponding transmit FIFO is

full. TCA will transition low on the rising

edge of TFCLK which samples Payload

byte 43 (TCALEVEL0=0) or 47

(TCALEVEL0=1) for the 8-bit interface

(ATM8=1), or the rising edge of TFCLK

which samples Payload word 19

(TCALEVEL0=0) or 23 (TCALEVEL0=1)

for the 16-bit interface (ATM8=0) if the

PHY being polled is the same as the PHY

in use. 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.

TCA is tri-stated when either the null-PHY

address (1FH) or an address not matching

the address space set by PHY_ADR[2:0]

is latched (by TFCLK) from the TADR[4:2]

inputs.

The polarity of TCA (with respect the the

description above) is inverted when the

TCAINV register bit is set to logic 1.

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