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LAN9211 数据表(PDF) 40 Page - SMSC Corporation |
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LAN9211 数据表(HTML) 40 Page - SMSC Corporation |
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40 / 147 page  High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support Datasheet Revision 2.9 (03-01-12) 40 SMSC LAN9211 DATASHEET EWDS (Erase/Write Disable): After issued, the EEPROM will ignore erase and write commands. To re-enable erase/write operations issue the EWEN command. Figure 3.13 EEPROM EWDS Cycle EWEN (Erase/Write Enable): Enables the EEPROM for erase and write operations. The EEPROM will allow erase and write operations until the “Erase/Write Disable” command is sent, or until power is cycled. Note: The EEPROM device will power-up in the erase/write-disabled state. Any erase or write operations will fail until an Erase/Write Enable command is issued. Figure 3.14 EEPROM EWEN Cycle 0 EECLK EEDIO (INPUT) EEDIO (OUTPUT) EECS 10 00 t CSL 0 EECLK EEDIO (INPUT) EEDIO (OUTPUT) EECS 10 11 t CSL |
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