ST75C540 datasheet(25/84 Pages) STMICROELECTRONICS

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VI.2 - Command Set

The Command Set has the following attractive

features :

- user friendly with easy to remember mnemonics,

- possibility of straightforward expansion with new

commands to suit specific customer require-

ments,

- easy upgrade of existing software using previous

modem based SGS-THOMSON products.

The command set has been designedto providethe

necessaryfunctional control on the ST75C530/540.

Each command is classified according to its syntax

and the presence/absence of parameters. In the

case of a parametric command, parameters must

first be written into the dual port RAM before the

command is issued. Acknowledge and error report

is issued for each command entered.

VI.2.1 - Command Set Summary

VI.2.1.1 - Operational Control Commands

INIT

Initialize. Initialize the modem engine.

Set all parameters to their default values

and wait for commands of the control

processor. Non parametric command.

IDT

Identify. Return the product identification

code. Non parametric command.

SLEEP

Tu r n

to l ow

power mode, t he

ST75C530/540 enters the low power

mode and stops its crystal oscillator to

reduce power consumption. In this mode

all the clocks are stopped and the dual

RAM is unreachable.

HSHK

Handshake. Begins th e handshake

sequence. The modem engine generates

all the sequences defined in the ITU-T

recommendations. A status report

indicatesto the controlprocessorthe state

of the handshake. This command only

applies to modes where a handshake

sequence is defined. A CONF command

must have been issued prior to the use of

HSHK. Non parametric command.

STOP

FAX Sto p. Sto p FAX Hal f-dupl ex

transmitter. Non parametric command.

RTRA

Retrain. Begin a retrain sequence in

V.32bis/V.32 or V.22bis modes as

des cr ibed

i n

t h e

I TU- T

recommendations (ST75C540 only).

SYNC

FAX Synchronize. Start/Stopof FAXHalf-

duplex receiver. Parametric command.

CSE

ClearStatusError.SelectivelyclearstheError

statusbyteSYSERR.Parametric command.

SETGN Set Gain. This command sets the global

gain factor, which is used for the transmit

samples. Parametric command.

VI.2.1.2 - Data Communication Commands

XMIT

Tr ans mi t

D ata.

St ar t /st op

th e

transmission of data. After a XMIT

command, the ST75C530/540sends the

data contained in its dual port RAM.

FORM

Selects the Transmission Format. This

command configures the data interface

for bo th re ceive r and tra nsmi tter

according to the selected data format.

Parametric command (HDLC, UART or

synchronous).

VI.2.1.3 - Memory Handling Commands

MWI

MWLO

Memory Write Indirect

Memory Write Low Word

Memory Write. This command is used to

write an arbitrary 16-bit value into the

writable memory location currently

specified by a parameter. Parametric

command.

MRI

MRLO

Memory Read Indirect

Memory Read Low Word

Memory Read. This command allows the

controller to read any of the ERAM or

C RO M ( S T75C 530/5 40 memo ry

spaces) location without interrupting the

processor. Parametric command.

Complex Read. This command allows

the controller to read at the same time

the real and imaginary part of a complex

valuestored ina double ERAM or

CROM location. This featu re is very

interesting for eye pattern software

control and for equalization monitoring.

This command insures that the real and

imaginary pa rts are sampled in the

memory at the same time (integrity).

Parametric command.

VI - USER INTERFACE (continued)

ST75C530 - ST75C540

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