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The organization of the serial string bits

An overall description of the definition of the serial string bits can be found here. However, I have found that the details of the overall order of the serial string bits send to the pc/mcm is not the same in our hardware as in that description. I determined this using the pc/mcm program, which aside from some details has the order of the bit string correct. I then looked to see what order that program actually sends the bits. The list here counts from the first bit in the serial string, but the serial string is send "backwards". Therefore, the first bit in the list below is actually the last bit sent.

purpose of bits bit numbers
in the substring 		bit numbers
in the complete string
heap manager 16 1
heap manager ... ...
heap manager 1 16
TGV1 190 17
TGV1 ... 16 + (191-i)
TGV1 1 206
TGV2 190 ... 1 207 ... 396
TGV3 190 ... 1 397 ... 586
TGV4 190 ... 1 587 ... 776
TGV5 190 ... 1 777 ... 996
TGV6 190 ... 1 997 ... 1156
TGV7 190 ... 1 1157 ... 1346
TGV8 190 ... 1 1347 ... 1536
AMU1 33 1537
AMU1 i=32...2 1538 ... 1568
AMU1 1 1569
AMU2 33 ... 1 1570 ... 1602
AMU3 33 ... 1 1603 ... 1635
AMU4 33 ... 1 1636 ... 1668
AMU5 33 ... 1 1669 ... 1701
AMU6 33 ... 1 1702 ... 1734
AMU7 33 ... 1 1735 ... 1767
AMU8 33 ... 1 1768 ... 1800

The table above describes the bits in the order they are described in all documentation written prior to today (1-June-2000). However, if we were to number the bits in the order in which they are sent out, the organization of the serial string (and the programs which manipulate it) would be a little simpler. In addition, because I anticipate using C programs to manipulate these data, I have started all indeces from 0 instead of 1.


purpose of bits bit numbers
in the substring
where 0 = first bit 		bit numbers
in the complete string
where 0 = first bit sent
AMU7 0 ... 32 0 ... 32
AMU6 0 ... 32 33 ... 65
AMU5 0 ... 32 66 ... 98
AMU4 0 ... 32 99 ... 131
AMU3 0 ... 32 132 ... 164
AMU2 0 ... 32 165 ... 197
AMU1 0 ... 32 198 ... 230
AMU0 0 ... 32 231 ... 263
TGV7 0 ... 189 264 ... 453
TGV6 0 ... 189 454 ... 643
TGV5 0 ... 189 644 ... 833
TGV4 0 ... 189 834 ... 1023
TGV3 0 ... 189 1024 ... 1213
TGV2 0 ... 189 1214 ... 1403
TGV1 0 ... 189 1404 ... 1593
TGV0 0 ... 189 1594 ... 1783
heap manager 0 ... 15 1784 ... 1799

Summary:

  • In the complete string, bit numbers i=0...32 for AMU j=0...7 appear in the positions (7-j)*33 + i.
  • In the complete string, bit numbers i=0...189 for TGV j=0...7 appear in the positions (7-j)*190 + i + 8*33, where 8*33=264.
  • In the complete string, bit numbers i=0...15 for the heap manager appear in positions 8*33 + 8*190 + i = 1784+i.

    John Sullivan
    updated 1-Jun-2000