ACC Utilities Reference Guide

TTGEN - ZCOM System Table Generator
Creating the TTGEN Configuration File
Chapter 2 45
Optional Z7340A Tunable Parameters
The parameters listed below may be specified immediately after an
8-channel PCI serial interface card <card-type> definition, on the
following line or lines, in any order.
Their purpose is to allow some flexibility in the allocation of memory and
resources on the ACC card. The total memory available on this card is
16M-bytes. These parameters allow you to fine tune how this memory is
divided up between internal tables and I/O buffers.
Any of these parameters may be omitted, in which case defaults are
applied, which should be sufficient for most applications. The use of
defaults for these parameters is recommended.
CAUTION Exercise utmost care when specifying these parameters as they directly
affect operation of the firmware on the ACC card. If in doubt, do NOT
specify these parameters in the ttgen file; rather use the defaults.
In order to modify these parameters it is necessary to first know what
the current defaults are. This can be achieved on a running system by
using the “zscan” utility. The “it” command displays the values of these
parameters for a given ACC card number.
For example
% zscan> it 0
will show information about ACC card 0.
The following parameters may be specified if the user wishes to modify
the usage of available table space.
ttablenbr number of terminal table entries (n-32k)
The number of terminal tables in use on an ACC card roughly
corresponds to the number of Physical Terminal Tables defined and
dynamically created for the card. If, for example, there were many
unused terminal tables, then the space could be better utilized for I/O
buffers instead. The default value of this parameter is ACC card type
dependent.
For the Z7340A card, the minimum value n is 9.
zbufsize size of buffer entries in bytes (64-8192, multiples of 16)