SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 344

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

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Video Processor Module
Offset 30h-33h
Offset 34h-37h
Offset 38h-3Bh
Offset 3Ch-3Fh
Controls the characteristics of the integrated video downscaler.
Offset 40h-43h
Indicates filter coefficients. The filters can be programmed independently to increase video quality when the downscaler is implemented.
Valid values for each filter coefficient are 0-15. The sum of coefficients must be 16. FLT_CO_4 is used with the earliest pixels and
FLT_CO_1 is used with the latest. Only luminance values of pixels are filtered.
Offset 44h-47h
Signature values stored in this register can be read by the host. This register is used for test purposes.
31:28
27:24
23:20
19:16
15:12
14:8
31:7
11:8
31:8
7:4
3:0
4:1
7:4
3:0
7:3
Bit
6
5
0
Table 6-7. F4BAR0+Memory Offset: Video Processor Configuration Registers (Continued)
Description
m (Defines m PLL2 Value). Relevant when SEL_REG_CAL (bit 20) = 1. The following formula is used for calculating the
frequency using m and n values:
Fvco
Km
Kn
OSCCLK = 27 MHz
Reserved
n (Defines n PLL2 Value). Relevant when SEL_REG_CAL (bit 20) = 1. The following formula is used for calculating the fre-
quency using m and n values:
Fvco
Km
Kn
OSCCL
Reserved
DTS (Downscale Type Select).
0: Type A (Downscale formula is 1/m+1, m pixels are dropped, 1 pixel is kept).
1: Type B (Downscale formula is m/m+1, m pixels are kept, 1 pixel is dropped).
Reserved
DFS (Downscale Factor Select). Determines the downscale factor to be programmed into these bits, where m is used to
derive the desired downscale factor depending on bit 6 (DTS).
DCF (Downscaler and Filtering). Enables/disables downscaler and filtering logic.
0: Disable.
1: Enable.
Note:
Reserved
FLT_CO_4 (Filter Coefficient 4). For the tap-4 filter.
Reserved
FLT_CO_3 (Filter Coefficient 3). For the tap-3 filter.
Reserved
FLT_CO_2 (Filter Coefficient 2). For the tap-2 filter.
Reserved
FLT_CO_1 (Filter Coefficient 1). For the tap-1 filter.
SIG_VALUE (Signature Value). (Read Only) A 24-bit signature value is stored in this bit field and can be read at any time.
The signature is produced from the RGB data output of the mixer. This bit field is used for test purpose only.
See SIGN_EN (bit 0) description for more information.
Reserved
No downscaling support for RGB 5:6:5 and YUV 4:2:0 video formats.
= OSCCLK * Km/Kn
= m + 1
= n + 1
= OSCCLK * Km/Kn
= m + 1
= n + 1
= 27 MHz
(Continued)
Video Downscaler Coefficient Register (R/W)
Video Downscaler Control Register (R/W)
CRC Signature Register (R/W)
Reserved
Reserved
Reserved
344
Reset Value: 00000000h
Reset Value: 00000000h
Reset Value: 00000000h
Reset Value: 00000000h
Reset Value: 00000000h
Reset Value: xxxxx100h
Revision 3.0