Receive Subaddress #1
Descriptor Block
Command #1
Receive three words
Command #2
Receive two words
Command #3
Receive three words
CONTROL WORD
DATA POINTER A
DATA POINTER B
BROADCAST
Index field contents: 02XX (hex)
Data Pointer A: 0100 (hex)
Data Pointer B: XXXX (hex)
Broadcast Data Pointer: XXXX (hex)
Message Info Word
Time-Tag
Data Word #1
Data Word #2
Data Word #3
Message Info Word
Time-Tag
Data Word #1
Data Word #2
Message Info Word
Time-Tag
Data Word #1
Data Word #2
Data Word #3
0100 (hex) Index equals two
0101 (hex)
0102 (hex)
0103 (hex)
0104 (hex) Index decrements to one
0105 (hex) Index equals one
0106 (hex)
0107 (hex)
0108 (hex)
Index decrements to zero
(interrupt generated if enabled)
0109 (hex) Index equals zero
010A (hex)
010B (hex)
010C (hex)
010D (hex) Index remains zero
(Data Pointer A = 109)
Note:
x = “don’t care”
26
Figure 5. Non-Broadcast Receive Message Indexing
SµMMIT FAMILY