ACC Utilities Reference Guide

48 Chapter2
TTGEN-ZCOMSystemTableGenerator
Creating the TTGEN Configuration File
tsize:t0:t1:t2:t3 t0 is the size of 10ms timer table in bytes,
(8-256000, multiple of 8)
t1 is the size of 100ms timer table in bytes,
(8-256000, multiple of 8)
t3 is the size of 10s timer table in bytes
(8-256000, multiple of 8)
t2 is the size of 1s timer table in bytes,
(8-256000, multiple of 8)
These parameters represent the number internal timer resources in the
ACC card. Each timer occupies 8 bytes, with an 8 bytes header for group
of timers. t0, t1, and t3 all default to 4108 bytes (1026 timers). The t3
default value is ACC card type dependent.
The timer entries are required for normal operation of the protocols. If
there are too few timers, unexpected protocol operation may occur.
datadelay data transfer delay (0-100 units of milliseconds)
The driver and ACC firmware transfer data using a protocol capable of
transferring multiple messages in each direction in a single transaction.
Each such transaction requires only a single interrupt to the driver. A
small delay in the data transfer protocol ensures that the protocol runs
efficiently, transferring several messages p er transaction when they are
available. Too small a delay may result in unnecessary system CPU
utilization. A larger delay will increase the latency of message transfers
to and from the ACC interface. The default value of 5 milliseconds has
been chosen after careful performance measurements by
Hewlett-Packard. The default value is strongly recommended.