## Physical Device Driver Reference

[prev][next][parent][TOC]

### ASYNC_GETDCBINFO (73h) - Flags3

Flags3 Has the following bits:

Bit 0 Enable Write Infinite Timeout processing

Bits 1-2 Read Timeout processing. Has the following:

Bit 2 Bit 1 Description
0 1 Normal Read Timeout processing
1 0 Wait-For-Something, Read Timeout processing
1 1 No-Wait, Read Timeout processing

Bits 3-4 Extended Hardware Buffering. Has the following:

Bit 4 Bit 3 Description
0 0 Not supported
0 1 Extended Hardware Buffering Disabled
1 0 Extended Hardware Buffering Enabled
1 1 Automatic Protocol Override

Bits 5-6 Receive Trigger Level. Has the following:

Bit 6 Bit 5 Description
0 0 1 character
0 1 4 characters
1 0 8 characters
1 1 14 characters

Bit 7 Transmit Buffer Load Count

0 = 1 character
1 = 16 characters

See ASYNC_SETDCBINFO for field definitions.