Datasheet

SN65LVDS315
SLLS881F –DECEMBER 2007–REVISED SEPTEMBER 2012 www.ti.com
Preventing Wrong Synchronization
To avoid actual pixel data from being erroneously interpreted as a control command, the SN65LVDS315
incorporates bit manipulation. If the SN65LVDS315 parallel input detects a bit sequence of eight 1s followed by
sixteen 0s, it replaces the LSB of the 0x00 parallel input word with a one instead of a zero (so the actual pixel
value will be adjusted from 0x00 to 0x01). Here are a few examples:
input code on DIN: 0xFF.00.00 serial output sequence on D0: 0xFF.00.01
input code on DIN: 0xFE.01.00.00 serial output sequence on D0: 0xFE.01.01.00
D[7:0] parallel input Code serial output code before correction
Byte 1 Byte 2 Byte 3 Byte 4
MSB—LSB MSB—LSB MSB—LSB MSB—LSB ---time-------------------------------------------→
11111111 00000000 00000000 xxxxxxxx 11111111 00000000 00000000 xxxxxxxx
1111111x 00000001 00000000 xxxxxxx0 x1111111 10000000 00000000 0xxxxxxx
111111xx 00000011 00000000 xxxxxx00 xx111111 11000000 00000000 00xxxxxx
11111xxx 00000111 00000000 xxxxx000 xxx11111 11100000 00000000 000xxxxx
1111xxxx 00001111 00000000 xxxx0000 xxxx1111 11110000 00000000 0000xxxx
111xxxxx 00011111 00000000 xxx00000 xxxxx111 11111000 00000000 00000xxx
11xxxxxx 00111111 00000000 xx000000 xxxxxx11 11111100 00000000 000000xx
1xxxxxxx 01111111 00000000 x0000000 xxxxxxx1 11111110 00000000 0000000x
↓ ↓ ↓ ↓
D[7:0] parallel input Code (corrected) serial output code after correction
Byte 1 Byte 2 Byte 3 Byte 4
MSB—LSB MSB—LSB MSB—LSB MSB—LSB ---time------------------------------------------------------→
11111111 00000000 00000001 xxxxxxxx 11111111 00000000 10000000 xxxxxxxx
1111111 x 00000001 00000001 xxxxxxx0 x1111111 10000000 10000000 0xxxxxxx
111111xx 00000011 00000001 xxxxxx00 xx111111 11000000 10000000 00xxxxxx
11111xxx 00000111 00000001 xxxxx000 xxx11111 11100000 10000000 000xxxxx
1111xxxx 00001111 00000001 xxxx0000 xxxx1111 11110000 10000000 0000xxxx
111xxxxx 00011111 00000001 xxx00000 xxxxx111 11111000 10000000 00000xxx
11xxxxxx 00111111 00000001 xx000000 xxxxxx11 11111100 10000000 000000xx
1xxxxxxx 01111111 00000001 x0000000 xxxxxxx1 11111110 10000000 0000000x
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