PM7340-PI datasheet(39/334 Pages) PMC

39 / 334 page

PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7340 S/UNI-IMA-8

DATA SHEET

PMC-2001723

ISSUE 3

INVERSE MULTIPLEXING OVER ATM

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

Pin Name

Type

No.

Function

TADR[6]

TADR[5]

TADR[4]

TADR[3]

TADR[2]

TADR[1]

TADR[0]

Input

K19

K22

K21

K20

J19

J22

J21

The Transmit Address (TADR[6:0]) signals are

used to address logical channels for the purpose of

polling and device selection. The TADR[6:0] signals

are valid only when the TCSB signal is sampled

active in the following TCLK cycle.

The TADR[6:0] input bus is sampled on the rising

edge of TCLK.

TCSB

Input

J20

The Transmit Chip Select (TCSB) is an active low

signal that is used to select the S/UNI-IMA-8

transmit interface. When the TCSB is sampled low, it

indicates that the TADR[6:0] sampled at the

previous clock is a valid address. If the TCSB is

sampled high, the device is not selected and the

TADR[6:0] sampled on the previous cycle is not a

valid address and is ignored. When sufficient

address space is provided by TADR[6:0] for all

devices on the bus, this signal may be tied low.

The TCSB is asserted low one cycle after a valid

address is present on the TADR[6:0] signals.

The TCSB input is sampled on the rising edge of

TCLK.

TSOP

Input

H19 The Transmit Start of Packet (TSOP) is an active

high signal that marks the start of the cell on the

TDAT[15:0] bus. When TSOP is active, the first word

of the cell is present on the TDAT[15:0] bus.

The TSOP output is sampled on the rising edge of

TCLK.

TSX

Input

H22 The Transmit Start of Transfer (TSX) signal is an

active high signal that marks the first cycle of a data-

block transfer on the TDAT[15:0] bus. When the

TSX signal is active, the coinciding data on the

TDAT[15:0] bus represents the in-band PHY

address.

The TSX output is sampled on the rising edge of

RCLK.

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