3 slot 2: status data port, 4 slot 3: pcm record left channel, 5 slot 4: pcm record right channel – Intel PXA255 User Manual

3 slot 2: status data port, 4 slot 3: pcm record left channel, 5 slot 4: pcm record right channel | 6 slot 5: optional modem line codec, Input slot 2 bit definitions -11 | Intel PXA255 User Manual | Page 461 / 598