FS450, FS451
PRELIMINARY PRODUCT DESCRIPTION
JUNE, 2000, VERSION 1.2
27
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© 1999,2000 FOCUS ENHANCEMENTS, INC.
PRELIMINARY INFORM ATION
6.2.9 NCOD - Denominator of NCO Word
Denominator of NCO Word (14)
7
6
5
4
3
2
1
0
NCOD7
NCOD6
NCOD5
NCOD4
NCOD3
NCOD2
NCOD1
NCOD0
Denominator of NCO Word (15)
7
6
5
4
3
2
1
0
NCOD15
NCOD14
NCOD13
NCOD12
NCOD11
NCOD10
NCOD9
NCOD8
Denominator of NCO Word (16)
7
6
5
4
3
2
1
0
NCOD23
NCOD22
NCOD21
NCOD20
NCOD19
NCOD18
NCOD17
NCOD16
Denominator of NCO Word (17)
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Reg
Bit#
Bit Name
Description
16, 15, 14
7-0,7-0,7-0
NCOD23-0
Denominator of NCO Word [23:0]. Denominator of clock
synthesizer to generate VGA input clock. NCOD is a 24 bit
unsigned number.
Range: {NCON*2 : (2
24-1)}
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: NCOD = 858 x 525 x 512 / 128 = 1,801,800
PAL: NCOD = 864 x 625 x 512 / 128 = 2,160,000
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