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Bitfields for Intel 82371SB legacy support register

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Bit Description

15

A20GATE pass-through sequence ended
write 1 to clear this bit

14

reserved

13

USB PIRQ enabled

12

USR IRQ status (read-only)

11

trap caused by write to PORT 0064h
write 1 to clear this bit

10

trap caused by read from PORT 0064h
write 1 to clear this bit

9

trap caused by write to PORT 0060h
write 1 to clear this bit

8

trap caused by read from PORT 0060h
write 1 to clear this bit

7

enable SMI at end of A20GATE Pass-Through

6

A20GATE pass-through sequence in progress (read-only)

5

enable A20GATE pass-through sequence (write PORT 64h,D1h; write 60h,xxh; read 64h; write 64h,FFh)

4

enable trap/SMI on USB IRQ

3

enable trap/SMI on PORT 0064h write

2

enable trap/SMI on PORT 0064h read

1

enable trap/SMI on PORT 0060h write

0

enable trap/SMI on PORT 0060h read

See Also:

#01215,#01225