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AM79C976 数据表(PDF) 97 Page - Advanced Micro Devices |
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AM79C976 数据表(HTML) 97 Page - Advanced Micro Devices |
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97 / 309 page  8/01/00 Am79C976 97 P R E L I M INARY boundary in the EEPROM. If an even number of regis- ters need to be loaded from the EEPROM, two dupli- cate entries for the same register can be included so that the CRC is aligned properly. For full compatibility with legacy Magic Packet soft- ware, the EEPROM should initialize both the APROM area (offset 0-0Fh) and the PADR Register. Data are shifted into or out of the EEPROM most sig- nificant bit first. Figure 41 shows the mapping of the 3-byte entries into the 16-bit word-oriented EEPROM. If the Am79C976 device detects a CRC error in the EE- PROM or fails to detect the presence of an EEPROM, it restores all registers to their default values and clears the PVALID bit in BCR19 to indicate the error. )LJXUH ((3520 'DWD )RUPDW )LJXUH ((3520 (QWU\ 3RVLWLRQV 5HJLVWHU$GGUHVV '$7$> @ '$7$> @ (QWU\IRUUHJLVWHU 'DWDFRYHUHG E\&5& %\WH 5HJLVWHU$GGUHVV '$7$> @ '$7$> @ ))K &5&> @ &5&> @ %\WH $'5 '$7$> @ '$7$> @ :RUG $'5 '$7$> @ '$7$> @ :RUG $'5 '$7$> @ '$7$> @ $'5 '$7$> @ '$7$> @ 6KDGHGDUHD UHSUHVHQWVHQWU\ %LW |
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