Simple NCO to generate a sine, square or sawtooth output. Sine wave is generated from a table and square and sawtooth from the phase accumulator. Note: Output is unsigned 8bit.
Modeselection is done with the uio[1:0]: 0: NONE, output is 0 1: SINE 2: SQUARE 3: SAWTOOTH Frequency word is 16bit and is given as split into upper and lower part. Lower part is given with by uio[2]='1' and ui[7:0]=word and the upper part by uio[3]='1' and ui[7:0]=word.
None.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | ModeSelectionBit0 | ||
| 1 | ModeSelectionBit1 | ||
| 2 | FrequencyWordLower8BitUpdateEnable | ||
| 3 | FrequencyWordUpper8BitUpdateEnable | ||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |