MSM7564-01 Просмотр технического описания (PDF) - Oki Electric Industry

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производитель

MSM7564-01

A Single Chip 14.4 kbps Data & Fax Modem

Oki Electric Industry 

MSM7564-01

¡ Semiconductor

PIN DESCRIPTIONS

System and Clock

Symbol

MCK

RST

SLEEP

CKOEN

CPUCLK

GACLK

Type

Description

I Master Clock Input

Frequency of 3.888 MHz ±100 ppm, with a duty ratio of between 45 and 55%.

I Reset Input

'0' : reset state, '1' : normal operation

I Sleep Input

'0' : sleep state, '1' : normal operation

I Clock Output Enable

'0' : CPUCLK and GACLK pins are enabled to output.

(Internal PLL operates normally in sleep state.)

'1' : CPUCLK and GACLK pins are disabled to output.

(Internal PLL turns to be power down in sleep state.)

O CPU Clock Output

CPUCLK outputs a 15.552 MHz clock for external CPU.

O Gate Array Clock Output

GACLK outputs a 13.824 MHz clock for external gate array.

Modem Digital Interface

Symbol

ST1

ST2

RT

STD

SRD

Type

Description

I External Transmit Clock Input

An external transmit clock provided to input to ST1. The clock frequency of 300 to

14400 Hz is supplied by the local DTE.

O Internal Transmit Clock Output

ST2 outputs the transmitting data clock of between 300 and 14400 Hz selected by

modem mode.

O Internal Receive Clock Output

RT outputs the receiving data clock of between 300 and 14400 Hz selected by modem

mode.

I Transmit Data Serial Input

STD inputs the transmit serial data synchronized with either internal timing selected by

modem mode or ST1 / ST2.

O Received Data Serial Output

SRD outputs the received serial data synchronized with either internal timing selected

by modem mode or RT.

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