THS8083A Datasheet, PDF (58/64 Pages) Texas Instruments – TRIPLE 8 BIT 80 MSPS 3.3V VIDEO AND GRAPHICS

To achieve lock with an incoming HS, TERMCNT is programmed with 1312 (i.e., the total number of pixels
per line in this mode).
Below are the settings for popular video and graphics modes.
VESA MODES
Mode #1: 640x350 at 85 Hz → fpix = 31.5 MHz, N = 832
REGISTER NAME
TERM_CNT_0
TERM_CNT_1
NOM_INC_0
NOM_INC_1
NOM_INC_2
NOM_INC_3
NOM_INC_4
VCO_DIV
SEL_CLK
VALUE
(DEC)
832
VALUE
(HEX)
340
29.090905 1d.0ba2c9c
8
8
4
4
REGISTER VALUE
(HEX)
40
03
9c
2c
ba
e8
0
3
2
Mode #2: 640x400 at 85 Hz → fpix = 31.5 MHz, N = 832 (same settings as 640x350 at 85 Hz)
Mode #3: 720x400 at 85 Hz → fpix = 35.5 MHz, N = 936
REGISTER NAME
TERM_CNT_0
TERM_CNT_1
NOM_INC_0
NOM_INC_1
NOM_INC_2
NOM_INC_3
NOM_INC_4
VCO_DIV
SEL_CLK
VALUE
(DEC)
936
VALUE
(HEX)
3a8
25.813057 19.68123fa
8
8
4
4
REGISTER VALUE
(HEX)
a8
03
fa
23
81
ce
0
03
02
Mode #4: 640x480 at 59.94 Hz → fpix = 25.175 MHz, N = 800
REGISTER NAME
TERM_CNT_0
TERM_CNT_1
NOM_INC_0
NOM_INC_1
NOM_INC_2
NOM_INC_3
NOM_INC_4
VCO_DIV
SEL_CLK
VALUE
(DEC)
800
VALUE
(HEX)
320
18.1998713 12.1995620
8
8
8
8
REGISTER VALUE
(HEX)
20
03
20
56
99
91
0
03
03
Mode #5: 640x480 at 72 Hz → fpix = 31.5 MHz, N = 832 (same settings as 640x350 @ 85 Hz)
A–2