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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN89218 датащи(PDF) 39 Page - Microchip Technology |
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LAN89218 датащи(HTML) 39 Page - Microchip Technology |
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39 / 148 page  2008-2015 Microchip Technology Inc. DS60001255B-page 39 LAN89218 WRAL (Write All): If erase/write operations are enabled in the EEPROM, this command will cause the contents of the E2P_DATA register to be written to every EEPROM memory location. The EPC_TO bit is set if the EEPROM does not respond within 30 ms. Table 3-10 shows the number of EECLK cycles required for each EEPROM operation. 3.9.2.2 MAC Address Reload The MAC address can be reloaded from the EEPROM via a host command to the E2P_CMD register. If a value of 0xA5h is not found in the first address of the EEPROM, the EEPROM is assumed to be un-programmed and MAC Address Reload operation will fail. The “MAC Address Loaded” bit indicates a successful load of the MAC address. The EPC_LOAD bit is set after a successful reload of the MAC address. 3.9.2.3 EEPROM Command and Data Registers Refer to Section 5.3.23 and Section 5.3.24 for a detailed description of these registers. Supported EEPROM operations are described in these sections. 3.9.2.4 EEPROM Timing Refer to Section 6.9 for detailed EEPROM timing specifications. FIGURE 3-18: EEPROM WRAL CYCLE TABLE 3-10: REQUIRED EECLK CYCLES Operation Required EECLK Cycles ERASE 10 ERAL 10 EWDS 10 EWEN 10 READ 18 WRITE 18 WRAL 18 0 EECLK EEDIO (INPUT) EEDIO (OUTPUT) EECS 1 D7 D0 0 01 t CSL |
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