NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 1076 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
JPEG Primary Scaling-Down Control Register (JPSCALD)
Register
Offset
R/W
Description
Reset Value
JPSCALD
J 0x058 R/W
JPEG Primary Scaling-Down Control Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
PSX_ON
PS_LPF_ON
Reserved
PSCALX_F
7
6
5
4
3
2
1
0
Reserved
PSCALY_F
Bits
Description
[31:16]
Reserved
Reserved.
[15]
PSX_ON
Primary Image Horizontal Down-scaling for Encode/Decode
0 = Disable, no horizontal down-scale.
1 = Enable.
Note:
When
FLY_TYPE
= 2’b1x, the down-scaling function is not supported.
In packet format decode mode, the image is arbitrarily down-scaled 1X~16X for Y422 and
Y420, 1X~8X for Y444.
[14]
PS_LPF_ON
Primary Image Down-scaling Low Pass Filter for Decode
0 = Disable, no down-scale low pass filter.
1 = Enable.
[13]
Reserved
Reserved.
[12:8]
PSCALX_F
Primary Image Horizontal Down-scaling Factor
A 5-bit value specifies the horizontal down-scaling factor. The scaling factor is equal to
2*(1+SCALX_F). For example, if SCALX_F = 1, the image will shrink 4 times in horizontal
direction.
Note:
1. For planar format encode mode, SCALX_F can be any value from 0 to 31. For
planar format decode mode, the value of SCALX_F can only be 0, 1, 3 i.e. scaling-down
1/2, 1/4 and 1/8.
2. For planar format decode mode, the image width after down-scaling needs to be multiple
of 4.
3. For packet format, SCALX_F is reserved.
[7:6]
Reserved
Reserved.