TMPR28051 datasheet(34/90 Pages) AGERE

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Data Sheet

TMPR28051 STS-1/AU-3 (STM-0) Mapper

August 1999

Lucent Technologies Inc.

Microprocessor Interface Description

Overview

The device is equipped with an asynchronous microprocessor interface that allows operation with most commer-

cially available microprocessors. Inputs MPMUX and MPMODE are used to configure this interface into one of four

possible modes. The MPMUX setting selects either a multiplexed 8-bit address/data bus (AD[7:0]), or a demulti-

plexed 8-bit address bus (A[7:0]) and an 8-bit data bus (AD[7:0]). The MPMODE setting selects the associated set

of registers within the device.

The microprocessor interface can operate at speeds up to 33 MHz in interrupt-driven or polled mode without

wait-states. To conform to standards, there are a limited number of default powerup or reset states. All read/write

registers must be written by the microprocessor on system start-up to guarantee proper device functionality.

Microprocessor Configuration Modes

Table 12 highlights the four microprocessor modes controlled by the MPMUX and MPMODE inputs.

Table 12. Microprocessor Configuration Modes

Mode

MPMODE

MPMUX

Address/Data

Bus

Generic Control, Data, and Output Pin Names

Mode 1

DeMUXed

CS, AS, DS, R/W, A[7:0], AD[7:0], INT, DTACK

Mode 2

MUXed

CS, AS, DS, R/W, AD[7:0], INT, DTACK

Mode 3

DeMUXed

CS, ALE, RD, WR, A[7:0], AD[7:0], INT, RDY

Mode 4

MUXed

CS, ALE, RD, WR, AD[7:0], INT, RDY

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