LAN9500 Datasheet, PDF (84/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
5.7.4.1 Supported EEPROM Operations
The EEPROM controller supports the following EEPROM operations under Host control via the E2P_CMD register. The
operations are commonly supported by “93C46” EEPROM devices. A description and functional timing diagram is pro-
vided below for each operation. Please refer to the E2P_CMD register description in Section 7.3.12, "EEPROM Com-
mand Register (E2P_CMD)," on page 136 for E2P_CMD field settings for each command.
ERASE (Erase Location): If erase/write operations are enabled in the EEPROM, this command will erase the location
selected by the EPC Address field (EPC_ADDR). The EPC_TO bit is set if the EEPROM does not respond within 30mS.
FIGURE 5-21:
EEPROM ERASE CYCLE
EECS
EECLK
EEDIO (OUTPUT)
EEDIO (INPUT)
1
1
1
A6
tCSL
A0
ERAL (Erase All): If erase/write operations are enabled in the EEPROM, this command will initiate a bulk erase of the
entire EEPROM.The EPC_TO bit is set if the EEPROM does not respond within 30mS.
FIGURE 5-22:
EEPROM ERAL CYCLE
tCSL
EECS
EECLK
EEDIO (OUTPUT)
1
0
0
1
0
EEDIO (INPUT)
EWDS (Erase/Write Disable): After issued, the EEPROM will ignore erase and write commands. To re-enable
erase/write operations issue the EWEN command.
DS00001875A-page 84
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