ST18D952 查看數據表（PDF） - STMicroelectronics

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ST18D952

DIGITAL SIGNAL PROCESSOR (DSP) CHIP

STMicroelectronics 

ST18952

2 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)

Pin name

IDE0-15

IAE0-15

IRDE

IWRE

IBSE

Table 2.2

Type

I/O

O

O

O

O

Description

Instruction data extension bus.

Instruction address extension bus.

I-extension bus read strobe. Active low.

I-extension bus write strobe. Active low.

I-extension bus strobe. Active low.

Direct Y bus extension (35 pins)

Pin name

YDE0-15

YAE0-15

YRDE

YWRE

YBSE

Table 2.3

Type

I/O

O

O

O

O

Description

Y data extension bus.

Y address extension bus.

Y-extension bus read strobe. Active low.

Y-extension bus write strobe. Active low.

Y-extension bus strobe. Active low.

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

Pin name

ED_XDE0-15

EA_XAE0-15

EIRD

EIWR

XBSE

EYRD

EYWR

XRDE_EXRD

XWRE_EXWR

Type

I/O

O

O

O

O

O

O

O

O

Description

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

sion bus.

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

tension bus.

BSU EIRD output

BSU EIWR output

X extension bus data strobe

BSU EYRD output

BSU EYWR output

Multiplexed output.

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

Multiplexed output.

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

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