PM7346 datasheet(70/419 Pages) PMC

70 / 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 49

Pin Name

Type

Pin No.

Function

RFCLK

Input

P20

Receive FIFO Read Clock (RFCLK). This

signal is used to read ATM cells from the

receive FIFOs. RFCLK must cycle at a 52

MHz or lower instantaneous rate, but at a

high enough rate to avoid FIFO overflows.

Please note that the RFCLK input is not 5

V tolerant, it is a 3.3 V only input pin.

DRCA[4]

DRCA[3]

DRCA[2]

DRCA[1]

Output

L17

M20

M19

M18

Direct Access Receive Cell Available

(DRCA[4:1]). These output signals

indicate when a cell is available in the

receive FIFO for the corresponding port.

DRCA[4:1] can be configured to be de-

asserted when either zero or four bytes

remain in the FIFO. DRCA[4:1] will thus

transition low on the rising edge of RFCLK

after Payload byte 48 (RCALEVEL0=1) or

43 (RCALEVEL0=0) is output for the 8-bit

interface (ATM8=1), or after Payload word

24 (RCALEVEL0=1) or 19

(RCALEVEL0=0) is output for the 16-bit

interface (ATM8=0).

The DRCA[4:1] outputs can be used to

support Utopia Direct Access mode.

PHY_ADR[2]

PHY_ADR[1]

PHY_ADR[0]

Input

K18

L20

L19

Device Identification Address

(PHY_ADR[2:0]). The PHY_ADR[2:0]

inputs are the most-significant bits of the

address space which this S/UNI-QJET

occupies. When the PHY_ADR[2:0] inputs

match the TADR[4:2] or RADR[4:2] inputs,

then one of the four quadrants (as

determined by the TADR[1:0] or RADR[1:0]

inputs) in this S/UNI-QJET is selected for

transmit or receive ATM access.

Note that the null-PHY address 1FH is an

invalid address and will not be identified to

any port on the S/UNI-QJET.

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