Reference Guide

ZCOM Tables and Data Structures
Interface Table
Chapter 3 91
The out-of-transmit-buffers (XPS queue) bit.
For a non-4-port card, indicates the status of ports.
For a 4-port card, indicates the status of subchannels.
The DAM maintains the port status to determine the usability of a
port/subchannel. A port/subchannel is operating normally if the status value
is zero. If it is out of transmit buffers, no new transmit data transfer will be
initiated. If the port/subchannel is disabled, down or undefined, the DAM will
ignore all processing for this port.
IPCNTR - Terminal count per port/subchannel
This field contains the number of terminals defined on each
port/subchannel of this Mux interface card. It is initialized by TTGEN
based on the number of Term entries in the TTGEN configuration file
and is kept for informational purposes only.
IPORTN - Port configuration buffer (zpconf_type)
This array contains the configuration bytes for each port on the Mux
card. The Port statements in the Port-Definition section of the TTGEN
configuration file are used to define the initial values of this array. Each
element of the array is associated with a single port on the Mux card.
Each element can be dynamically configured by calling the zport routine.
The layout is similar to the data portion of the $PORT backplane
transaction command for the 2/8-channel ACC cards and is as shown in
Table 3-19.
Table 3-19 Port Configuration Buffer IPORTN
31-30 29-28 27-26 25-24 23-22 21-20 19-16 15-14 13-0
ecode sync mode parity xclock sclock baud pmode spare