LAN9500 Datasheet, PDF (136/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
7.3.12 EEPROM COMMAND REGISTER (E2P_CMD)
Address:
030h
Size:
32 bits
This register is used to control the read and write operations on the Serial EEPROM.
Bits
Description
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, this means
that 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
attempting to read) the USB Descriptors and Ethernet default
register values, the EPC Busy bit is cleared.
Type
SC
Default
0b
DS00001875A-page 136
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