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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN9220 датащи(PDF) 91 Page - Microchip Technology |
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LAN9220 датащи(HTML) 91 Page - Microchip Technology |
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91 / 142 page  2006-2017 Microchip Technology Inc. DS00002417A-page 91 LAN9220 5.3.24 E2P_DATA – EEPROM DATA REGISTER This register is used in conjunction with the E2P_CMD register to perform read and write operations with the Serial EEPROM. 9 EPC Time-out. If an EEPROM operation is performed, and there is no response from the EEPROM within 30mS, the EEPROM controller will time- out and return to its idle state. This bit is set when a time-out occurs indicating that the last operation was unsuccessful. Note: If the EEDIO signal pin is externally pulled-high, EPC commands will not time out if the EEPROM device is missing. In this case the EPC Busy bit will be cleared as soon as the command sequence is complete. It should also be noted that the ERASE, ERAL, WRITE and WRAL commands are the only EPC commands that will time-out if an EEPROM device is not present -and- the EEDIO signal is pulled low R/WC 0 8 MAC Address Loaded. When set, this bit indicates that a valid EEPROM was found, and that the MAC address programming has completed normally. This bit is set after a successful load of the MAC address after power-up, or after a RELOAD command has completed R/WC - 7-0 EPC Address. The 8-bit value in this field is used by the EEPROM Controller to address the specific memory location in the Serial EEPROM. This is a Byte aligned address. R/W 00h Offset: B4h Size: 32 bits Bits Description Type Default 31-8 Reserved RO - 7:0 EEPROM Data. Value read from or written to the EEPROM. R/W 00h Bits Description Type Default |
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