Z89321 datasheet(29/40 Pages) ZILOG

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Z89321/371/391

Zilog

16-Bit Digital Signal Processors

DS97DSP0100

P R E L I M I N A R Y

A/D Accommodation

The CODEC interface can be used for serial A/D or serial

D/A transmission. The interface provides the necessary

control signals to adapt to many standard serial convert-

ers. The low-pass and smoothing filters are necessary for

systems with converters.

High-Speed Serial Port

The Z89321 CODEC interface can be used as a high-

speed serial port. The necessary control signals are pro-

vided for adaptation to standard processors or external pe-

ripherals. Byte, word, or 64-bit data can be transmitted at

speeds up to 10 Mbps. (Condition includes a 20 MHz os-

cillator. Data can be transferred with single-cycle instruc-

tions to an internal register file.)

8-Bit CODEC Interface

The Z89321 provides an option for a standard 8-bit CO-

DEC interface. Hardware

m-law compression is available

(expansion performed by software lookup table). The CO-

DEC interface transmits data consisting of 8-bit or com-

pounded 8-bit information. Figure 27 shows a typical sche-

matic arrangement.

The timing for this type of arrangement is presented in Fig-

ure 28. The flexible design provides adaptation for 16-bit

linear CODEC.

Figure 26. A/D, D/A Implementation Block Diagram

SCLK

Communicate

Data

Serial

Data In

CLKIN

FSO

FS1

TXD

Serial A/D

Serial

Data Out

Low-Pass

Filter

Analog

CLKIN

Communicate

Data

Smoothing

Filter

Analog

Out

RXD

Serial A/D

Z89321/371/391

Table 7. Tabulated Transmission Rates*

Transmission

Rate

Maximum SCLK

10 Mbps

Maximum Frame Sync

8-bit

769.2 kHz

16-bit

476.2 kHz

Stereo (64-bit)

263.2 kHz

Note: Calculations consider the interrupt access time (typically

four cycles), transfer of data, loading of new data, and latency pe-

riods between CODEC transfers. During the interrupt cycle, de-

velopers often execute additional software, affecting the

maximum transfer rate. Calculations are for single-channel trans-

fers only.

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