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LAN9252/ML 数据表(PDF) 95 Page - Microchip Technology |
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LAN9252/ML 数据表(HTML) 95 Page - Microchip Technology |
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95 / 329 page ![]() 2015 Microchip Technology Inc. DS00001909A-page 95 LAN9252 8-BIT READ One of the Index Registers is set as described above. The address is then set to access the lower BYTE of the corre- sponding Data Register. Read data is driven on D[7:0] during RD active. D[15:8] pins are not used or driven. The cycle repeats for the remaining BYTEs of the Data Register. 8-BIT WRITE One of the Index Registers is set as described above. The address is then set to access the corresponding Data Reg- ister. Data on D[7:0] is written on the trailing edge of WR. D[15:8] pins are not used or driven. The cycle repeats for the remaining BYTEs of the Data Register. FIGURE 9-32: INDEXED ADDRESSING INTERNAL REGISTER DATA ACCESS - 8-BIT READ FIGURE 9-33: INDEXED ADDRESSING INTERNAL REGISTER DATA ACCESS - 8-BIT WRITE CS RD WR INDEX,2'b00 D[15:8] A[4:0] INDEX,2'b01 Index 7:0 D[7:0] Index 15:8 DATA,2'b00 DATA,2'b01 INDEX,2'b10 INDEX,2'b11 8'hXX 8'hXX Hi-Z Data 7:0 Data 15:8 Data 23:16 Data 31:24 DATA,2'b10 DATA,2'b11 CS RD WR INDEX,2'b00 D[15:8] A[4:0] INDEX,2'b01 Index 7:0 D[7:0] Index 15:8 DATA,2'b00 DATA,2'b01 INDEX,2'b10 INDEX,2'b11 8'hXX 8'hXX Hi-Z Data 7:0 Data 15:8 Data 23:16 Data 31:24 DATA,2'b10 DATA,2'b11 |
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