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ST75C540 Datasheet(PDF) 37 Page - STMicroelectronics

Part # ST75C540
Description  SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C540 Datasheet(HTML) 37 Page - STMicroelectronics

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MWI
Memory Write Indirect
MWI
Opcode:
2A
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
1
7..0
Indirect address
MWI_IVALUE_L
2
7..0
Low byte of the 16-bit value
MWI_IVALUE_H
3
7..0
High byte of the 16-bit value
MWLO
Memory Write Low Word
MWLO
Opcode:
2B
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
1
7..0
Low byte of the 16-bit value
MWLO_VALUE_H
2
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
1
0
0
1
Retrain (V.22bis, V.32, V.32bis)
Ratr negotiation (V.32bis, V.22bis)
RTRA_SP0
1
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
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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