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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) 125 Page - Advanced Micro Devices |
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AM79C976 датащи(HTML) 125 Page - Advanced Micro Devices |
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125 / 309 page  8/01/00 Am79C976 125 P R E L I M INARY $87232// $XWR3ROO 5HJLVWHU Offset 08Ch This register controls the automatic polling of a user- selectable external PHY register, AP_REG2. 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 in this register is 0. Table 34. AUTOPOLL2: Auto-Poll2 Register Bit Name Description 15 AP_REG2_EN Enable Bit for Autopoll Register 2. When this bit and the Auto-Poll External PHY bit (APEP) in CMD1 are both set to 1, the Auto-Poll State Machine periodically reads the external PHY register selected by the AP_PHY2_ADDR and AP_REG2_ADDR fields and sets the APINT2 interrupt bit if it detects a change in the register’s contents. 14-13 RES Reserved locations. Written as zeros and read as undefined. 12-8 AP_REG2_ADDR AP_REG2 Address. This field contains the register number of an external PHY register that the Auto-Poll State Machine will periodically read if the AP_REG2_EN bit in this register and the APEP bit (CMD3, bit 24) is set. 7 RES Reserved location. Written as zero and read as undefined. 6 AP_PRE_SUP2 Auto-Poll Preamble Suppression. If this bit is set to 1, the Auto-Poll State Machine will suppress the preambles of the MII Management Frames that it uses to periodically read the external PHY register selected by the AP_PHY2_ADDR and AP_REG2_ADDR fields. This bit is ignored when the AP_PHY2_DFLT bit is set. 5 AP_PHY2_DFLT Auto-Poll PHY2 Default. When this bit is set, the Auto-Poll State Machine ignores the contents of the AP_PHY2_ADDR and AP_PRE_SUP2 fields and uses the AP_PHY0_ADDR field for the address of the PHY device to be polled. If this bit is set, the Auto-Poll State Machine will suppress preambles only if the Port Manager has determined that the default external PHY can accept MII Management Frames without preambles. (The Port Manager examines bit 6 in register 1 of the default PHY to make this determination.) 4-0 AP_PHY2_ADDR Auto-Poll PHY2 Address. This field contains the address of the external PHY that contains AP_REG2. This bit is ignored when the AP_PHY2_DFLT bit is set. |
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