lan83c175 Standard Microsystems Corp., lan83c175 Datasheet - Page 39

• Manufacturer Part Number: lan83c175
• Description: Ethernet Cardbus Integrated Controller With Modem Support Corporation
• Manufacturer: Standard Microsystems Corp.

24 - DPE:
when a data parity error occurs on the
CardBus bus while EPIC/C is bus master.
This interrupt will only be set when the Parity
Error
configuration space is set.
23 - RSV: Receive status valid (read only -
does not generate an interrupt) - indicates that
the PRSTAT register contains valid status for
the frame currently being processed.
22 -
(read only - does not generate an interrupt) -
indicates that the copy in progress that has
passed the early receive copy threshold. This
bit returns zero when there is no receive copy
currently in progress or when the current copy
has not passed the threshold.
21 - RBE: Receive buffers empty (read only -
does not generate an interrupt) - indicates that
there is no data ready for copy in the receive
buffer.
20 - TCIP: Transmit copy in progress (read
only - does not generate an interrupt) -
indicates that a transmit DMA copy is partially
completed.
receive DMA begins to copy a frame. The bit is
reset after the copy completes and the status
is posted.
19 - RCIP: Receive copy in progress (read
only - does not generate an interrupt) -
indicates that receive DMA copy is partially
completed.
receive DMA begins to copy a frame. The bit
is reset after the copy completes and the
status is posted.
RCTS: Receive copy threshold status
Response
CardBus data parity error - set
The bit is set each time the
The bit is set each time the
bit
in
the
CardBus
39
18 - TXIDLE: Transmit idle (read only - does not
generate an interrupt) - indicates that the NIC
transmitter and CardBus transmit DMA have
returned their reset states.
17 - RXIDLE: Receive idle (read only - does not
generate an interrupt) - indicates that the NIC
receiver and CardBus receive DMA have returned
their reset states.
16 - INT_ACTV: Interrupt active (read only - does
not generate an interrupt) - indicates that an
interrupt which is not masked is currently set.
This allows the host to read the interrupt status
through a register, even when interrupts are
disabled.
15 - GP2_INT:
when the pin GPIO2) goes low.
used by the phy to indicate an event.
14-13 - Unused.
12 - FATAL_INT: This signal becomes true if any
fatal error occurs. These are DPE, APE, PMA,
and PTE. Note that these are also reflected in the
interrupt status word (27:24).
11 - RCT: Receive copy threshold crossed - set
when the receive copy in progress crosses the
CardBus receive copy threshold.
10 - PREI:
indicates that a packet is being received, with the
probability that by the time the host responds to
the interrupt, the packet will have been completely
received, reducing latency.
9 - CNT: Counter overflow - indicates that one of
the error counters is nearing its maximum count.
8 - Transmit underrun - set when an early transmit
underrun occurs.
automatically when the TXUGO bit in the
command register is set. Clearing this interrupt
This preemptive interrupt event
This interrupt becomes active
This interrupt is cleared
It is typically