LAN91C111 Datasheet, PDF (73/142 Pages) SMSC Corporation – 10/100 Non-PCI Ethernet Single Chip MAC + PHY

10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
OFFSET
D
NAME
INTERRUPT MASK
REGISTER
TYPE
SYMBOL
READ/WRITE
MSK
MDINT
MASK
0
ERCV INT
MASK
0
EPH INT
MASK
0
RX_OVRN
INT
MASK
ALLOC INT
MASK
TX EMPTY
INT
MASK
0
0
0
TX INT
MASK
0
RCV INT
MASK
0
This register can be read and written as a word or as two individual bytes.
The Interrupt Mask Register bits enable the appropriate bits when high and disable them when low. A
MASK bit being set will cause a hardware interrupt.
MDINT - Set when the following bits in the PHY MI Register 18 (Serial Port Status Output Register)
change state.
1. LNKFAIL, 2) LOSSSYNC, 3) CWRD, 4) SSD, 5) ESD, 6) PROL, 7) JAB, 8) SPDDET, 9) DPLXDET.
These bits automatically latch upon changing state and stay latched until they are read. When they
are read, the bits that caused the interrupt to happen are updated to their current value. The MDINT
bit will be cleared by writing the acknowledge register with MDINT bit set.
ERCV INT - Early receive interrupt. Set whenever a receive packet is being received, and the number
of bytes received into memory exceeds the value programmed as ERCV THRESHOLD (Bank 3, Offset
Ch). ERCV INT stays set until acknowledged by writing the INTERRUPT ACKNOWLEDGE REGISTER
with the ERCV INT bit set.
EPH INT - Set when the Ethernet Protocol Handler section indicates one out of various possible
special conditions. This bit merges exception type of interrupt sources, whose service time is not
critical to the execution speed of the low level drivers. The exact nature of the interrupt can be obtained
from the EPH Status Register (EPHSR), and enabling of these sources can be done via the Control
Register. The possible sources are:
LINK - Link Test transition
CTR_ROL - Statistics counter roll over
TXENA cleared - A fatal transmit error occurred forcing TXENA to be cleared. TX_SUC will be low and
the specific reason will be reflected by the bits:
■ TXUNRN - Transmit under-run
■ SQET - SQE Error
■ LOST CARR - Lost Carrier
■ LATCOL - Late Collision
■ 16COL - 16 collisions
Any of the above interrupt sources can be masked by the appropriate ENABLE bits in the Control
Register.
1. 1) LE ENABLE (Link Error Enable), 2) CR ENABLE (Counter Roll Over), 3) TE ENABLE (Transmit
Error Enable)
EPH INT will only be cleared by the following methods:
SMSC LAN91C111-REV B
73
DATASHEET
Revision 1.8 (07-13-05)