lan9313 Standard Microsystems Corp., lan9313 Datasheet - Page 162

• Manufacturer Part Number: lan9313
• Description: Lan9313/lan9313i Three Port 10/100 Managed Ethernet Switch With Mii
• Manufacturer: Standard Microsystems Corp.

Revision 1.2 (04-08-08)
BITS
15:0
18
17
16
EEPROM Loader Address Overflow (LOADER_OVERFLOW)
This bit indicates that the EEPROM Loader tried to read past the end of the
EEPROM address space. This indicates misconfigured EEPROM data.
This bit is cleared when the EEPROM Loader is restarted with a RELOAD
command, or a Digital Reset(DIGITAL_RST).
EEPROM Controller Timeout (EPC_TIMEOUT)
This bit is set when a timeout occurs, indicating the last operation was
unsuccessful. If an EEPROM ERASE, ERAL, WRITE or WRAL operation is
performed and no response is received from the EEPROM within 30mS, the
EEPROM controller will timeout and return to its idle state.
For the I
the appropriate ACKs, if the EEPROM slave device holds the clock low for
more than 30ms, or if an unsupported EPC_COMMAND is attempted.
This bit is cleared when written high.
Note:
Configuration Loaded (CFG_LOADED)
When set, this bit indicates that a valid EEPROM was found and the
EEPROM Loader completed normally. This bit is set upon a successful load.
It is cleared on power-up, pin and DIGITAL_RST resets, or at the start of a
RELOAD.
This bit is cleared when written high.
EEPROM Controller Address (EPC_ADDRESS)
This field is used by the EEPROM Controller to address a specific memory
location in the serial EEPROM. This address must be byte aligned.
2
When in Microwire mode, if an EEPROM device is not connected,
an internal pull-down on the EEDI pin will keep the EEDI signal low
and allow timeouts to occur. If EEDI is pulled high externally, EPC
commands will not time out if an EEPROM device is not connected.
In this case the EPC_BUSY bit will be cleared as soon as the
command sequence is complete. It should also be noted that the
ERASE, ERAL, WRITE and WRAL commands are the only EPC
commands that will timeout if an EEPROM device is not present
AND the EEDI signal is pulled low.
C mode, the bit is also set if the EEPROM fails to respond with
DESCRIPTION
DATASHEET
162
Three Port 10/100 Managed Ethernet Switch with MII
R/WC
TYPE
R/W
SMSC LAN9313/LAN9313i
RO
RO
DEFAULT
0000h
Datasheet
0b
0b
0b