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LAN89730 データシート(PDF) 137 Page - Microchip Technology |
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LAN89730 データシート(HTML) 137 Page - Microchip Technology |
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137 / 218 page ![]() 2013-2015 Microchip Technology Inc. DS60001348A-page 137 LAN89730 6.3.12 EEPROM COMMAND REGISTER (E2P_CMD) This register is used to control the read and write operations on the Serial EEPROM. Address: 030h Size: 32 bits Bits Description Type Default 31 EPC Busy When a ‘1’ is written into this bit, the operation specified in the EPC Command field is performed at the specified EEPROM address. This bit will remain set until the operation is complete. In the case of a read, the host can read valid data from the E2P Data register. The E2P_CMD and E2P_DATA registers should not be modified until this bit is cleared. In the case where a write is attempted and an EEPROM is not present, the EPC Busy remains busy until the EPC time-out occurs. At that time, the busy bit is cleared. Note: EPC busy will be high immediately following power-up, chip-level, or USB reset. After the EEPROM controller has finished reading (or attempts to read) the USB Descriptors and Ethernet default register values, the EPC Busy bit is cleared. SC 0b |
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