Date: 09/03/98
Distribution: External
KDB #: KDB-0232
Author: Support
Rev 0.00
!!!! This applies to the NT960 Universal firmware, which is
used for WinNT & QNX4.
1. RX threshold, sets the threshold at which the UART will
generate a
receive interrupt, allowable values are 0 to 12. Zero (firmware
default) has
special meaning. The RX threshold will be set according to the
baud rate
setting as follows:
<=2400 12
<=4800 11
<=9600 10
<=19200 9
<=38400 8
<=57600 7
<=76800 6
>76800 5
Setting the RX threshold to 1 gives the shortest reaction time
(latency) to
RX characters.
2. TX load (default 12, range 1 to 12) sets the number of
characters that
are loaded into the transmitter each time it goes empty. This
option slightly effects
the amount of time spent in the TX interrupt handler. It might
make a small effect on the
RX latency (i.e.: lowering the TC load may decrease the RX
latency).
3. RX timeout (default 5mS, range 5 to 1275mS) changes the time
the receiver
takes to respond to RX characters WHEN the number of characters is
BELOW the RX
threshold. This can be set in 5mS increments. A higher setting
improves the
overall throughput, by allowing the receiver to fill up to the
threshold
more often, but at the expense of longer latency for single
characters. If
the RX threshold is set to 1, the RX timeout is meaningless.
End of KDB-0232