ZCOM Tables and Data Structures
Interface Table
TXCX_HEAD - Pointer to head of the express queue linked lists
TXCA_HEAD - Pointer to head of the
TXCB_HEAD - Pointer to head of the
ITXLSTX - Pointer to express terminal list array (in union)
ITXLSTA - Pointer to
ITXLSTB - Pointer to
IPLIMIT - Pointer to port/subchannel unack Tx limit array (in union)
IPBYTES - Pointer to port/subchannel unack Tx size array (in union)
IPSTAT - Pointer to port/subchannel status array (in union)
IPCNTR - Pointer to # of terminals per port/subchannel array (in union) IPORTN - Pointer to port configuration array (in union)
IFPLOOK - Pointer to PTT interrupt vector array.
IFCMDBP - Pointer to current backplane command buffer (in union)
These fields are used internally by the ZCOM subsystem.
CARD - Interface card specific data structures (union)
This field is a union which contains two structures. These structures hold information that are specific to the type of interface card associated with this IFT entry. The structure card.mmp is used if the IFT is associated with an
CARD.MMP has the following fields shown in Table
Table | CARD.MMP Structure |
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Field Name |
| Field Description | Field Type | Size |
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itxlstx |
| Express terminal list headers | struct[128] | 128*40 |
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itxlsta |
| High priority terminal list headers | struct[128] | 128*40 |
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itxlstb |
| Low priority terminal list headers | struct[128] | 128*40 |
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iplimit |
| Port unack TX limit (in bytes) | uns.int [128] | 128*4 |
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ipbytes |
| Port unack TX size (in bytes) | int [128] | 128*4 |
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ipendg_bufs |
| Total pending Tx size (in bufrs) | int [128] | 128*4 |
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82 | Chapter 3 |