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AM79C987 датащи(PDF) 9 Page - Advanced Micro Devices |
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AM79C987 датащи(HTML) 9 Page - Advanced Micro Devices |
9 / 30 page AMD P R E L I M I N A R Y 9 Am79C987 Port (P) Register Register (R) Register Command (C) Port Data (D) Port C/ D = 1 Bank 0 Bank 1 Register Register 0 31 0 31 0 31 Register Bank 31 Port (or Bank) Pointer Register (or Attribute) Pointer 000XXXXX 111XXXXX C/ D = 0 17305B-4 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . Figure 1. Overview of HIMIB Register Definition An exception to the normal Command/Data Port access scheme, is the Status Register which is read directly by reading only the C Port. This allows the Status Register to be read directly, without the need to write to the C Port. Register Definition In the following description, all bit fields are ordered such that the left most bit is the most significant bit. Un- used Port and Register Numbers are reserved and should not be accessed as this may cause device mal- function. When specifying the Port or Bank Number, the following command byte is written to the C Port: C Port Write MSB LSB 0 0 0 P4 P3 P2 P1 P0 P[4:0] represent the Register Bank or Port Number. These are organized as follows: P = [P4P3P2P1P0] Note that to access the P register the three most signifi- cant bits of this byte must be zero. P [4:0] Port/Register Bank 0 Repeater Registers 1 Port Status Registers 2 Port Control Registers 16 – 23 Twisted Pair Ports Attributes 31 AUI Port Attributes When specifying the Register or Attribute to be ac- cessed, the following command byte is written to the C Port. C Port Write MSB LSB 1 1 1 R4 R3 R2 R1 R0 R = [R4R3R2R1R0] Note that to access the R register the three most signifi- cant bits of this byte must be one. |
Аналогичный номер детали - AM79C987 |
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Аналогичное описание - AM79C987 |
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