LAN91C111 datasheet(51/125 Pages) MICROCHIP

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DS00002276A-page 51

LAN91C111

8.14

Bank 1 - General Purpose Register

This register can be used as a way of storing and retrieving non-volatile information in the EEPROM to be used by the

software driver. The storage is word oriented, and the EEPROM word address to be read or written is specified using

the six lowest bits of the Pointer Register.

This register can also be used to sequentially program the Individual Address area of the EEPROM, that is normally

protected from accidental Store operations.

This register will be used for EEPROM read and write only when the EEPROM SELECT bit in the Control Register is

set. This allows generic EEPROM read and write routines that do not affect the basic setup of the LAN91C111.

8.15

Bank 1 - Control Register

RCV_BAD - When set, bad CRC packets are received. When clear bad CRC packets do not generate interrupts and

their memory is released.

AUTO RELEASE - When set, transmit pages are released by transmit completion if the transmission was successful

(when TX_SUC is set). In that case there is no status word associated with its packet number, and successful packet

numbers are not even written into the TX COMPLETION FIFO. A sequence of transmit packets will generate an interrupt

only when the sequence is completely transmitted (TX EMPTY INT will be set), or when a packet in the sequence expe-

riences a fatal error (TX INT will be set). Upon a fatal error TXENA is cleared and the transmission sequence stops. The

packet number that failed, is present in the FIFO PORTS register, and its pages are not released, allowing the CPU to

restart the sequence after corrective action is taken.

OFFSET

NAME

TYPE

SYMBOL

GENERAL PURPOSE

READ/WRITE

GPR

HIGH

BYTE

HIGH DATA BYTE

000

LOW

BYTE

LOW DATA BYTE

000

OFFSET

NAME

TYPE

SYMBOL

CONTROL REGISTER

READ/WRITE

CTR

HIGH

BYTE

Reserved

RCV_

BAD

Reserved

AUTO

RELEASE

Reserved

001

LOW BYTE

ENABLE

Reserved

EEPROM

SELECT

RELOAD

STORE

000

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