ST18952 datasheet(5/67 Pages) STMICROELECTRONICS

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ST18952

Pin Description

The following tables detail the ST18952 pin set. There is one table for each group of pins. The

tables detail the pin name, type and a short description of the pin function.

Signal names have an overbar if they are active low, otherwise they are active high.

Table 2.1

Direct I bus extension (35 pins)

Table 2.2

Direct Y bus extension (35 pins)

Table 2.3

Direct X bus extension / bus extension through bus switch unit (39 pins)

Pin name

Type

Description

IDE0-15

I/O

Instruction data extension bus.

IAE0-15

Instruction address extension bus.

IRDE

I-extension bus read strobe. Active low.

IWRE

I-extension bus write strobe. Active low.

IBSE

I-extension bus strobe. Active low.

Pin name

Type

Description

YDE0-15

I/O

Y data extension bus.

YAE0-15

Y address extension bus.

YRDE

Y-extension bus read strobe. Active low.

YWRE

Y-extension bus write strobe. Active low.

YBSE

Y-extension bus strobe. Active low.

Pin name

Type

Description

ED_XDE0-15

I/O

Multiplexed input/output. Bus switch unit extension data bus or X data exten-

sion bus.

EA_XAE0-15

Multiplexed output. Bus switch unit extension address bus or X address ex-

tension bus.

EIRD

BSU EIRD output

EIWR

BSU EIWR output

XBSE

X extension bus data strobe

EYRD

BSU EYRD output

EYWR

BSU EYWR output

XRDE_EXRD

Multiplexed output.

X-extension bus read strobe (XRDE) or BSU EXRD output.

XWRE_EXWR

Multiplexed output.

X-extension bus write strobe (XWRE) or BSU EXWR output.

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