ST18952 datasheet(12/67 Pages) STMICROELECTRONICS

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ST18952

D950Core

The D950Core is composed of three main units.

• Data Calculation Unit (DCU)

• Address Calculation Unit (ACU)

• Program Control Unit (PCU)

For full details of the D950 DSP core refer to the D950Core datasheet (

document number 42-

1709).

These units are organized in an HARVARD architecture around three bidirectional 16-bit

buses, two for data and one for instruction. Each of these buses is dedicated to an uni-

directional 16-bit address bus (XA/YA/IA).

An 8-bit general purpose parallel port (P0-P7) can be configured (input or output). A test

condition is attached to each bit to test external events.

The D950Core is controlled through interface pins related to interrupt, low-power mode, reset

and miscellaneous functions.

Figure 4.1

D950Core block diagram

DATA

CALCULATION

UNIT

ADDRESS

CALCULATION

UNIT

PROGRAM

CONTROL

UNIT

TEST & EMULATION

PO/P7

CONTROL

XA-bus

YA-bus

ID-bus

IA-bus

Control

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