Alternate Tap Positions
Here are some selected alternate tap positions which can be used with
cascaded 8-bit shift registers
used in the fibonacci configuration to obtain a maximal length sequence. These
are suitable for shift register IC's where outputs of registers
6, 7, and 8 of each circuit are available. Cases with 2 and with 4 taps are shown.
(This list is not complete.)
| No. IC's | No. Registers used | Taps |
|---|
| 1 | 7 | 6, 7 |
| 2 | 15 | 8, 15 |
| 2 | 15 | 14, 15 |
| 3 | 22 | 8, 14, 15, 22 |
| 3 | 23 | 14, 23 |
| 3 | 23 | 15, 16, 22, 23 |
| 3 | 23 | 14, 15, 22, 23 |
| 3 | 23 | 7, 14, 22, 23 |
| 3 | 23 | 7, 8, 22, 23 |
| 3 | 24 | 7, 22, 23, 24 |
| 3 | 24 | 7, 16, 22, 24 |
| 3 | 24 | 7, 8, 22, 24 |
| 3 | 24 | 6, 7, 22, 24 |
| 4 | 31 | 24, 31 |
| 4 | 31 | 16, 24, 30, 31 |
| 4 | 31 | 8, 16, 24, 31 |
| 4 | 31 | 7, 22, 24, 31 |
| 4 | 31 | 8, 23, 24, 31 |
| 4 | 32 | 16, 23, 30, 32 |
| 4 | 32 | 6, 15, 30, 32 |
| 4 | 32 | 14, 23, 30, 32 |
| 7 | 55 | 31, 55 |
| 8 | 63 | 62, 63 |
| 10 | 79 | 70, 79 |
| 13 | 103 | 94, 103 |
| 15 | 119 | 111, 119 |
| 16 | 127 | 126, 127 |
| 20 | 159 | 128, 159 |
Applicable Shift Registers include: 4014, 4021
Other Shift Registers which can be used include: 74164, 74595, 74599, 4094
(Though additional circuitry may be necessary.)
Questions/Comments to:
suits@mtu.edu
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