LAN91C111 datasheet(63/125 Pages) MICROCHIP

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DS00002276A-page 63

LAN91C111

8.25

Bank 3 - RCV Register

RCV DISCRD - Set to discard a packet being received. Will discard packets only in the process of being received. When

set prior to the end of receive packet, bit 4 (RXOVRN) of the interrupt status register will be set to indicate that the packet

was discarded. Otherwise, the packet will be received normally and bit 0 set (RCVINT) in the interrupt status register.

RCV DISCRD is self clearing.

MBO - Must be 1.

8.26

Bank 7 - External Registers

nCSOUT is driven low by the LAN91C111 when a valid access to the EXTERNAL REGISTER range occurs.

OFFSET

NAME

TYPE

SYMBOL

RCV REGISTER

READ/WRITE

RCV

HIGH

BYTE

Reserved

000

LOW

BYTE

RCV

DISCRD

Reserved

MBO

000

111

OFFSET

NAME

TYPE

SYMBOL

THROUG

H 7

EXTERNAL REGISTERS

HIGH

BYTE

EXTERNAL R/W REGISTER

LOW

BYTE

EXTERNAL R/W REGISTER

Cycle

nCSOUT

LAN91C111 Data Bus

AEN=0

A3=0

A4-15 matches I/O BASE

BANK SELECT = 7

Driven low. Transparently latched on nADS

rising edge.

Ignored on writes.

Tri-stated on reads.

BANK SELECT = 4,5,6

High

Ignore cycle.

Otherwise

High

Normal LAN91C111 cycle.

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