| Bits | Description |
|---|---|
| 7:6 | I2S enable (soft reset = 00) 00 = i2s off 01 = i2s is mono source right 10 = i2s is mono source left 11 = i2s is stereo |
| 5 | Reserved, must be 0 |
| 4 | 0 PCM_DOUT to pi, PCM_DIN from pi (hats) (soft reset = 0) = 1 PCM_DOUT from pi, PCM_DIN to pi (pi) |
| 3 | Mute left side (soft reset = 0) |
| 2 | Mute right side (soft reset = 0) |
| 1 | Reserved must be 1 |
| 0 | Direct i2s audio to EAR on port 0xFE (soft reset = 0) |