PEF2015 datasheet(18/84 Pages) SIEMENS

18 / 84 page

Semiconductor Group

12.97

PEF 2015

Operational Description

The MICO, designed as a flexible line-card controller, has the following main

applications:

– Digital line cards, with the CFI typically configured as IOM-2, IOM-1 (MUX) or SLD.

– Analog line cards, with the CFI typically configured as IOM-2 or SLD.

– Intelligent NTs, where the MICO’s ability to configure the CFI as a PCM interface is

utilized.

To operate the MICO the user must be familiar with the device’s microprocessor

interface, interrupt structure and reset logic.

The device is derived from the EPIC core. With some restrictions it is therefore

programmable like the EPIC.

3.1

Microprocessor Interface Operation

The MICO is programmed via an 8-bit parallel interface that can be selected to be

(1) Motorola type, with control signals DS, R/W, and CS.

(2) Siemens / Intel non-multiplexed bus type, with control signals WR, RD,

and CS.

(3) Siemens / Intel multiplexed address/data bus type, with control signals

ALE, WR, RD, and CS.

The selection is performed via supplying address pins A0 and A1 during reset as follows:

Note: When selecting the multiplexed bus mode, it has to be ensured that during a MICO

device reset the A0/ALE pin receives the appropriate level and no ALE transfers

by the

µC affect the interface type selection (refer also to figure 18, page 75).

When using the Siemens / Intel multiplexed interface, the MICO is addressed with even

addresses only (i.e. AD0 always 0), which allows data always to be transferred in the low

data byte. This simplifies the use of 16 bit Siemens / Intel type processors.

For a non-multiplexed bus structure the OMDR:RBS bit is needed in addition to the

address lines A3..0. OMDR:RBS (Register Bank Selection) selects one of two register

banks.

Table 1

Selection of Bus Interface

A1, A0 during reset

Bus Interface

Motorola type (1)

Siemens / Intel type, non-multiplexed (2)

01 or 10

Siemens / Intel type, multiplexed (3)

Pin A0 will take over the ALE functionality

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