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FS450, FS451
PRELIMINARY PRODUCT DESCRIPTION
JUNE, 2000, VERSION 1.2
26
COPYRIGHT
©
© 1999, 2000 FOCUS ENHANCEMENTS, INC.
PRELIMINARY INFORM ATION
6.2.8 NCON - Numerator of NCO Word
Numerator of NCO Word (10)
7
6
5
4
3
2
1
0
NCON7
NCON6
NCON5
NCON4
NCON3
NCON2
NCON1
NCON0
Numerator of NCO Word (11)
7
6
5
4
3
2
1
0
NCON15
NCON14
NCON13
NCON12
NCON11
NCON10
NCON9
NCON8
Numerator of NCO Word (12)
7
6
5
4
3
2
1
0
NCON23
NCON22
NCON21
NCON20
NCON19
NCON18
NCON17
NCON16
Numerator of NCO Word (13)
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Reg
Bit#
Bit Name
Description
12, 11, 10
7-0,7-0,7-0
NCON23-0
Numerator of NCO Word [23:0]. Numerator of clock synthesizer
to generate VGA input clock. NCON is a 24 bit unsigned number.
Range: {0 : NCOD/2}
The FS450 synthesizes a 27-85 MHz clock from the 27 MHz TV_CKIN and supplies this clock
(VGA_CKOUT) to the GCC. This clock is buffered and returned to the FS450 (VGA_CKIN) synchronous to
the RGB data and Sync information. This clock has a 1.5 Hz resolution and can be adjusted so the VGA
scaled input data rate exactly matches the CCIR 656 data output rate.
Frequency VGA / Frequency 656 = # VGA Pixels / # 656 Pixels x # VGA Lines / # 656 Lines
Frequency VGA / Frequency 656 = NCON / NCOD x M / N
Example: for SVGA mode, typ. total pixels x lines ~ 1024 x 625; let M=512, N=128:
NTSC and PAL: NCON = 1024 x 625 = 640,000
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