ACC Programmer's Reference Guide

84 Chapter3
ZCOM Tables and Data Structures
Interface Table
CARD.BSP has the following fields shown in Table 3-17.
The fields for both the card.mmp and card.bsp structures are described
below. In many cases, t he field names in the two structures are the same
and in such cases, their function is identical. Only the number o f
elements in the array is different. The itxlstx through iportn fields are
arrays indexed by the communication channel. Fo r the 2/8 -port ACC
cards (e.g. card.bsp), each element in the array represents a physical
port. For the 4-port E1/T1 ACC cards, these arrays are indexed by a
combination of port and subchannel. Specifically elements 0-31 represent
port 0 and subchannels 0 to 31; elements 32-63 represent port 1 and
subchannels 0 to 31, etc.
Table 3-17 CARD.BSP Structure
Field Name Field Description Field Type Size
(Bytes)
itxlstx Express terminal list headers struct[8] 8*40
itxlsta High priority terminal list headers struct[8] 8*40
itxlstb Low priority terminal list headers struct[8] 8*40
iplimit Port unack TX limit (in bytes) uns.int [8] 8*4
ipbytes Port unack TX size (in bytes) int [8] 8*4
ipstat Port status/Subchannel status uns.short [8] 8*2
ipcntr Terminal count per port uns.short [8] 8*2
iportn Port configuration bytes struct[8] 8*4
ifirqbp $FIRQ reply buffer pointer pointer 8
irespbp Backplane response buffer pointer pointer 8
istdtbp $STDT reply buffer pointer pointer 8
ifpntr Pointer to current PTT pointer 8
ifcmdbuf Current backplane command buffer uns.char [256] 256
ifirqbuf FIRQ response buffer uns.char [64] 64
irespbuf Backplane response buffer uns.char [64] 64
istdtbuf STDT status buffer uns.char [2048] 2048
iscratch Scratch area for buffer alignment uns.char [64] 64