ST75C530 datasheet(37/84 Pages) STMICROELECTRONICS

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MWI

Memory Write Indirect

MWI

Opcode:

001

01010

Synopsis

MWI allows the writing of a 16-bit parameter. Theparameters specifies an indirect address as well

asthe value to be transferred.Refer to the “RAM MappingApplicationNote” (delivered on request

accordingtorevisionnumber).Theadvantageto useMWIinsteadofMWisthattheIndirectAddress

is constant over the differentrelease of the product.

Parameters

Field

Byte

Pos.

Value

Definition

MWI_IADDR

7..0

Indirect address

MWI_IVALUE_L

7..0

Low byte of the 16-bit value

MWI_IVALUE_H

7..0

High byte of the 16-bit value

MWLO

Memory Write Low Word

MWLO

Opcode:

001

01011

Synopsis

MWLO allows the writing of a 16-bit parameter at the address defined by the following MW

or MW Absolute Address minus 1. This command must be followed by a MW or MWI

command.The double word writing is executed by the MW or MWI following command.

Parameters

Field

Byte

Pos.

Value

Definition

MWLO_VALUE_L

7..0

Low byte of the 16-bit value

MWLO_VALUE_H

7..0

High byte of the 16-bit value

RTRA (ST75C540 only)

Retrain

RTRA

Opcode:

02A

000

00101

Synopsis

RTRA is used to force the ST75C530/540 to initiate a retrain sequence or a rate negotiation.

If MODC_NOQUA bit is set, the ST75C530/540 will initiate a transmission at the maximum

speed defined by the RTRA parameter, otherwise it will found the best reliable speed based

on the quality of the line (within the RTRA allowed speed).

Parameters

Field

Byte

Pos.

Value

Definition

RTRA_NEG0

Retrain (V.22bis, V.32, V.32bis)

Ratr negotiation (V.32bis, V.22bis)

RTRA_SP0

7..4

xxx1

xx1x

x1xx

1xxx

1200bps allowed (V.22bis)

2400bps allowed (V.22bis)

4800bps allowed (V.32bis, V.32)

7200bps allowed (V.32bis)

RTRA_SP1

2..0

xx1

x1x

1xx

9600bps allowed (V.32bis, V.32)

12000bps allowed (V.32bis)

14400bps allowed (V.32bis)

VII - COMMAND SET DESCRIPTION (continued)

ST75C530 - ST75C540

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