Z8913820FSC View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z8913820FSC

VOICE PROCESSING CONTROLLERS

Zilog 

Z89138/Z89139

Voice Processing Controllers

Zilog

DSP REGISTERS DESCRIPTION

General. The DSP is a high-performance second genera-

tion CMOS Digital Signal Processor with a modified Har-

vard-type architecture with separate program and data

ports. The design has been optimized for processing pow-

er and saving silicon space.

Registers. The DSP has eight internal registers and sev-

en external registers. The external registers are for the A/D

and D/A converters, and the mailbox and interrupt interfac-

ing between DSP to the Z8. External registers are access-

ed in one machine cycle, the same as internal registers.

DSP Registers

There are 15 internal and extended 16-bit registers which

are defined in Table 11.

Register

BUS

X

Y

A

SR

SP

PC

P

EXT0

EXT1

EXT2

EXT3

EXT4

EXT5

EXT6

Attribute

Read

Read/Write

Read/Write

Read/Write

Read/Write

Read/Write

Read/Write

Read

Read

Write

Read

Write

Read

Write

Read

Write

Read/Write

Read

Write

Read/Write

Table 11. DSP Registers

Register Definition

Data-Bus

X Multiplier Input, 16-Bit

Y Multiplier Input, 16-Bit

Accumulator, 24-Bit

Status Register

Stack Pointer

Program Counter

Output of MAC, 24-Bit

Z8 ERF Bank B, Register 00-01 (from Z8)

Z8 ERF Bank B, Register 08-09 (to Z8)

Z8 ERF Bank B, Register 02-03 (from Z8)

Z8 ERF Bank B, Register 0A-0B (to Z8)

Z8 ERF Bank B, Register 04-05 (from Z8)

Z8 ERF Bank B, Register 0C-0D (to Z8)

Z8 ERF Bank B, Register 06-07 (from Z8)

Z8 ERF Bank B, Register 0E-0F (to Z8)

DSP Interrupt Control Register

A/D Converter

D/A Converter

Analog Control Register

EXT3-EXT0 (External Registers 3-0). These are the Mail-

box Registers used by the DSP and Z8 to communicate.

These four 16-bit registers correspond to the eight outgo-

ing and eight incoming 8-bit registers in Bank B of the Z8’s

Expanded Register File.

EXT5 (D/A and A/D Data Register). This register is used

by both D/A and A/D converters. The D/A converter is

loaded by writing to this register, while the A/D converter is

addressed by reading from this register. The Register

EXT5 is accessible only by the DSP.

EXT4 (DSP Interrupt Control Register (ICR)). This register

controls the interrupts in the DSP as well as the interrupts

in common between the DSP and the Z8. It is accessible

by the DSP only, except for bit F and bit 9.

EXT6 (Analog Control Register). This register controls the

D/A and A/D converters. It is a read/write register accessi-

ble only by the DSP.

42

PRELIMINARY

DS97TAD0201

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