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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C976 датащи(PDF) 123 Page - Advanced Micro Devices |
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AM79C976 датащи(HTML) 123 Page - Advanced Micro Devices |
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123 / 309 page  8/01/00 Am79C976 123 P R E L I M INARY Table 27. AP_VALUE1: Auto-Poll Value1 Register $3B9$/8( $XWR3ROO9DOXH5HJLVWHU Offset 0ACh The contents of this register are cleared to 0 when the RST pin is asserted. The register is not cleared at the start of a serial EEPROM read operation or after a se- rial EEPROM read error. Table 28. AP_VALUE2: Auto-Poll Value2 Register $3B9$/8( $XWR3ROO9DOXH5HJLVWHU Offset 0AEh The contents of this register are cleared to 0 when the RST pin is asserted. The register is not cleared at the start of a serial EEPROM read operation or after a se- rial EEPROM read error. Table 29. AP_VALUE3: Auto-Poll Value3 Register $3B9$/8( $XWR3ROO9DOXH5HJLVWHU Offset 0B0h The contents of this register are cleared to 0 when the RST pin is asserted. The register is not cleared at the start of a serial EEPROM read operation or after a se- rial EEPROM read error. Table 30. AP_VALUE4: Auto-Poll Value4 Register $3B9$/8( $XWR3ROO9DOXH 5HJLVWHU Offset 0B2h The contents of this register are cleared to 0 when the RST pin is asserted. The register is not cleared at the start of a serial EEPROM read operation or after a se- rial EEPROM read error. Table 31. AP_VALUE5: Auto-Poll Value5 Register $87232// $XWR3ROO5HJLVWHU Offset 088h This register controls the automatic polling of the status register of the default external PHY. All bits in this register are set to their default values by H_RESET. All bits are also set to their default values before EEPROM data are loaded or after an EEPROM read failure. The default value for all bits except for bits 15 (AP_REG0_EN) and 12:8 (AP_REG0_ADDR) is 0. The default value for AP_REG0_EN is 1 and the default value for the AP_REG0_ADDR field is 00001b. When loading the AUTOPOLL0 register from the EE- PROM, bits [9:5] are also loaded into BCR33 bits [9:5]. This allows operation with legacy drivers that expect the PHY address in that location. Table 32. AUTOPOLL0: Auto-Poll0 Register Bit Name Description 15-0 AP_VALUE 1 This register contains the results of the automatic polling of the user- selectable external PHY register, AP_REG1. Bit Name Description 15-0 AP_VALUE2 This register contains the results of the automatic polling of the user- selectable external PHY register, AP_REG2. Bit Name Description 15-0 AP_VALUE3 This register contains the results of the automatic polling of the user- selectable external PHY register, AP_REG3. Bit Name Description 15-0 AP_VALUE4 This register contains the results of the automatic polling of the user- selectable external PHY register, AP_REG4. Bit Name Description 15-0 AP_VALUE5 This register contains the results of the automatic polling of the user- selectable external PHY register, AP_REG5. Bit Name Description 15 AP_REG0_EN Enable Bit for Autopoll Register 0. This bit is read-only and always has the value 1. 14-13 RES Reserved locations. Written as zeros and read as undefined 12-8 AP_REG0_ ADDR AP_REG0 Address. This field is read-only and always has the value 00001. |
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