D950CORE データシートの表示（PDF） - STMicroelectronics

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D950CORE

16-Bit Fixed Point Digital Signal Processor (DSP) Core

STMicroelectronics 

D950-Core

4.2 Address Calculation Unit (ACU)

4.2.1 Introduction

The D950-Core ACU includes two identical address generators (one for each data memory

space), each containing:

• 2 x 16-bit address registers

• 4 x 16-bit index registers

• Adder for address register update

• 2 x 16-bit base and maximum address registers for modulo addressing. There

is dedicated logic for address comparison and calculation.

Figure 4.6 D950-Core Address Calculation Unit

XD

16

XA

16

YD

16

YA

16

6

6

IX0

IX1

BX

AX0

IX2

MX

AX1

IX3

SPX

STA

IY0

IY1

BY

AY0

IY2

MY

AY1

IY3

SPY

MODULUS

LOGIC

16-bit ADDER

MODULUS

LOGIC

16-bit ADDER

VR02017E

In addition to these two address generators, the D950-Core ACU includes:

• 16-bit Stack Pointer (SPX) register for the X-memory space mapped stack

• 16-bit Stack Pointer (SPY) register for the Y-memory space mapped stack

• 6 bits of STA register for addressing modes

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