Tiny Tapeout > Tiny Tapeout Chips > Tiny Tapeout 3 > 13 8bit configurable galois lfsr

13 8bit configurable galois lfsr

13 : 8bit configurable galois lfsr

Uses 2 cycles each to set the shift and xor mask registers. It has 3 operation modes: normal shift,

After reset, set the shift register and xor state, after that normal shift mode

#	Input	Output
0	clock	output[0] lsb normal lfsr output
1	reset	output[1] other 7 bits to see the full state
2	mode[0] 00 normal shift mode, 01 set register mode,	output[2]
3	mode[1] 10 set mode registers, 11 unused	output[3]
4	data_in[0] is used for both filling register and xor mask state	output[4]
5	data_in[1] needs 2 cycles to fill all 8 bits	output[5]
6	data_in[2] first cyle is lower 4 bits, 2nd upper 4 bits	output[6]
7	data_in[3] see above	output[7]