Initialization Table - Motorola MC68824 User Manual

Table 3·7. Set Value Opcodes
Code (Hex)
Length in Bytes Name
Description
08
2
HLPRI_THT High_Priority_ Token_Hold_TIme 802.4
OE
2
TAILROT(4) Target Rotation Time Access Class 4 802.4
12 2 TAILROT(2) Target Rotation Time Access Class 2 802.4
16
2
TAILROT(O) Target Rotation Time Access Class 0 802.4
1A 2 TAILROT(RM) Target Rotation Time Ring Maintenance 802.4
1C
2
RM_INIT Ring Maintenance Timer Initial Value 802.4
1E 2 SID Bridge Pair Source Segment Number
20
2 TID
Bridge Pair Target Segment Number
22 2 SILMASK Source Routing User Mask
24
2
MAX-I NT_SOL Maximum_lnter_SoliciLCount 802.4
26 2 RX-ERILMASK RX Frame Status Error Mask
28
2
TX-STAT(6) Status of TX Queue (6)
2A
4
TX-HOQ6 Tx Queue Access Class 6 HOQ Pointer
30 2 TX-STAT(4) Status of TX Queue (4)
32 4 TX-HOQ4 TX Queue Access Class 4 HOQ Pointer
38
2 TX-STAT(2) Status of TX Queue (2)
3A 4 TX-HOQ2 TX Queue Access Class 2 HOQ Pointer
40
2 TX-STAT(O) Status of TX Queue (0)
42 4 TX-HOQO Tx Queue Access Class 0 HOQ Pointer
48
4 RX-EOQ6 Rx ueue Access Class 6 EOQ Pointer
4C
4
RX-EOQ4 Rx Queue Access Clas 4 EOQ Pointer
50 4 RX-EOQ2 RX Queue Access Class 2 EOQ Pointer
54
4
RX-EOQO RX Queue Access Class 0 EOQ Pointer
58 4 FD_POOLPTR Free Frame Descriptor Pointer to First FD
5C 4 BD_POOLPTR Free Buffer Descriptor Pointer to First BD
60 2 GA-MASK-LOW Group Address Mask - Low Word
62'
4 GA-MASK-MED_HI Group Address Mask - Medium and High Words
66 2 lA-MASK-LOW Individual Address Mask - Low Word
68' 4 IA-MASK-MED_HI
Individual Address Mask - Medium and High Words
6C 2 MAX-RETRY Non-RWR Maximum Retry Limit 802.4
6E
2 RWILMAX-RETRY RWR Maximum Retry Limit
802.4
NOTE:
1. This value is not meaningful if the address length is 16 bits.
The command result area is the four word area following the command parameter area in the
initialization table and is located at offset 96 through 9C. The first three words of the command
result area are used to pass parameters from the TBC to the host while the fourth word contains
the status. The least significant bit of the CPA RESULT (fourth word of the command parameter
area), when set, indicates the TBC has completed the execution of the previous command. This
bit, referred to as the done bit, is valid for execution of all TBC commands except for the RESET
and LOAD INIT TABLE FC commands. The only confirmation for these commands is the value
'FF' of the semaphore register. If the done bit in the status word of the CPA is to be used to
determine the completion of a command, it must be cleared by the host prior to giving the
command. Another method to check to see if the TBC has finished processing a command is
through the TBC command complete bit (TCC) in the interrupt status word 0 located in the
initialization table (for all commands except RESET, LOAD INIT TABLE FC, and CLEAR INTERRUPT
STATUS).
MC68824 USER'S MANUAL
MOTOROLA
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II