## Physical Device Driver Reference

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### ASYNC_SETDCBINFO (53h) - Flags3

Flags3 Has the following bits:

Bit 0 Enable Write Infinite Timeout processing. See Note 8.

Bits 1-2 Enable Read Timeout processing. See Note 9.

Bit 2 Bit 1 Description
0 0 Invalid input. Results in a general failure error.
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. See Note 10.

Bit 4 Bit 3 Description
0 0 Not supported; ignored. No change to FIFO state.
0 1 Disabled
1 0 Enabled
1 1 Automatic Protocol Override.

Bits 5-6 Received trigger level. See Note 11.

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

Note: The trigger level must be set to 1 character when Enhanced mode is on.

Bit 7 Transmit Buffer Load Count. See Note 12.

0 = 1 character
1 = 16 characters.

Note: When Extended Hardware Buffering is disabled, this bit is set by the device driver.