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ST75C540 数据表(PDF) 37 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 37 Page - STMicroelectronics |
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37 / 84 page  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 37/84 |
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