PCVisionplus
Hardware Reference
Theory of Operation
2–19
Rev 02; February 8, 2002
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Input
LUT
ADC
data
11
10
9
8
7
6
5
4
3
2
1
0
ILUTSADR0
ILUTSADR1
ILUTSADR2
ILUTSADR3
Static
Page
Select
OVRSM=0
INMODE=1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Image
Buffer
Memory
Figure 2–18. Input LUT 12-bit Mode
With oversample enabled (OVRSM=1), the Input LUT provides one page for 16-bit input addressing, and there are
no page select bits available, as shown in Figure 2–19. You can load only one transform. If you are not oversampling
the pixel data, program the LUT to ignore the high byte input (delayed pixel) by repeating the same data pattern. If
you are oversampling, program the LUT to average the values input on the two address bytes.
In 8-bit input mode (INMODE=0) LUT output bits 11 through 4 are stored as a BYTE in the image buffer memory, as
shown in Figure 2–19. Bits 15 through 12 are discarded, and bits 3 through 0 are discarded.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Input
LUT
11
10
9
8
7
6
5
4
11
10
9
8
7
6
5
4
ADC
data
T–0
ADC
data
T–1
current pixel
delayed pixel
OVRSM=1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
INMODE=0
Image
Buffer
Memory
0
1
2
3
4
5
6
7
Figure 2–19. Input LUT Oversample Mode
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
