A-4 X1 CODER 100-101116
N L J H F D C B A
G R R R R T T T T
r e e e e P P P P
n d d d d
The X1A code is a shift register with the following equation:
1 + X6 + X8 + X11 + X12The X1B code is a shift register with the following equation:
1 + X1 + X2 + X5 + X8 + X9 + X10 + X11 + X12Where the exponents are the tap locations that are combined in an or gate and fed back to the input.
The X1 code is formed by the MOD 2 combination of X1A and X1B (i.e. a Gold Code).
I would expect to find a couple of 12 bit shift registers on this board with each bit's output brought out to a pin and some big OR gates and an external or gate to sum the codes.
blank | N74LS175B | AM25LS163PC | electro cap |
AM25LS194APC | 74128N | header r-----r- | SN74LS86N |
AM25LS194APC | F 93S47PC | DM74LS32N | TI SN74LS123N |
AM25LS194APC | 93S48 PC | TI SN74LS37N | header rcrcrcrc |
AM25LS194APC | 93S47PC | Beckman 899-1-R270 | TI SN74LS123N |
AM25LS194APC | 93S47PC | AM25LS163PC | AM25LS164PC |
AM25LS194APC | 93S48PC | AM25LS163PC | AM25LS164PC |
2000052 93427pc PROM? | F 93S47PC | AM25LS163PC | AM25LS164PC |
AM25LS09PC | Beckman 899-1-R1k | AM25LS151PC | AM25LS164PC |