STLC5464 datasheet(28/83 Pages) STMICROELECTRONICS

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III - FUNCTIONAL DESCRIPTION (continued)

16 Rx

C/I

16 Rx

MON

16 Tx

C/I

16 Tx

MON

INTERR UPT

CONTR OLLER

GC I CHANNEL DEFINITION

DIN 5

DIN 4

DOUT 4

DOUT 5

SWITCHING

MATRIX

D Cha nne ls

to R x HDLC

DCha nne ls

from Tx HDLC

Interna l Bus

GC I1

GCI0

GCI1

GC I0

Figure 11 : D, C/I and Monitor Channel Path

III.4 - Microprocessor Interface

III.4.1 - Description

The

Multi-HDLC circuit can be controlledby severa

types of microprocessors (ST9, Intel/Motorola 8 or

16 data bits interfaces) such as :

- ST9 family

- INTEL 80C188 8 bits

- INTEL 80C186 16 bits

- MOTOROLA 68000 16 bits

During the initialization of the

Multi-HDLC circuit,

the microprocessor interface is informedof the type

of microprocessor that is connectedby polarisation

of three external pins MOD 0/2).

Two chip Select (CS0/1)pins are provided.CS0 will

select the internal registers and CS1 the external

memory.

Table 14 : Microprocessor Interface Selection

MOD2

MOD1

MOD0

Microprocessor

80C188

80C186

68000

Reserved

001

ST9

III.4.2 - Definition of the Interface for the differ-

ent microprocessors

The signals connected to the microprocessor inter-

face are presented on the following figures for the

different microprocessor (see Figures 12, 13, 14,

15, 16 and 17 on Pages 29-30).

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