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294 Software Developer’s Manual
Register Descriptions
13.4.21 Interrupt Mask Clear Register
IMC (000D8h; W)
Software uses this register to disable an interrupt. Interrupts are presented to the bus interface only
when the mask bit is set to 1b and the cause bit set to 1b. The status of the mask bit is reflected in
the Interrupt Mask Set/Read Register (see Section 13.4.20), and the status of the cause bit is
reflected in the Interrupt Cause Read Register (see Section 13.4.17).
Software blocks interrupts by clearing the corresponding mask bit. This is accomplished by writing
a 1b to the corresponding bit in this register. Bits written with 0b are unchanged (their mask status
does not change).
RXSEQ 3 X
Sets mask for Receive Sequence Error.
This is a reserved bit for the 82541xx and 82547GI/EI. Set to 0b.
RXDMT0 4 X Sets mask for Receive Descriptor Minimum Threshold hit.
Reserved 5 X
Reserved
Should be written with 0b to ensure future compatibility.
RXO 6 X Sets mask for on Receiver FIFO Overrun.
RXT0 7 X Sets mask for Receiver Timer Interrupt.
Reserved 8 X
Reserved
Should be written with 0b to ensure future compatibility.
MDAC 9 X Sets mask for MDI/O Access Complete Interrupt.
RXCFG 10 X
Sets mask for Receiving /C/ ordered sets.
This is a reserved bit for the 82541xx and 82547GI/EI. Set to 0b.
Reserved 11 X
Reserved
Should be written with 0b to ensure future compatibility (not
applicable to the 82544GC/EI).
PHYINT 12 X
Sets mask for PHY Interrupt (not applicable to the 82544GC/EI).
This is a reserved bit for the 82541xx and 82547GI/EI. Set to 0b.
GPI 14:11 X Sets mask for General Purpose Interrupts (82544GC/EI only).
GPI 14:13 X Sets mask for General Purpose Interrupts.
TXD_LOW 15 X
Sets the mask for Transmit Descriptor Low Threshold hit (not
applicable to the 82544GC/EI).
SRPD 16 X
Sets mask for Small Receive Packet Detection (not applicable to
the 82544GC/EI).
Reserved 31:17 0b
Reserved
Should be written with 0b to ensure future compatibility.
Field Bit(s)
Initial
Value
Description