Ver 1.3
PRELIMINARY
EAGLE
3.29.1 JPEG DECODER MCU WIDTH Register (JDMWIDTH)
Address : FFE1 0234h
Bit
31 : 12
11 : 0
R/W
R
W
Description
Default Value
Reserved.
-
0h
JPEG Decoder MCU WIDTH
Set MCU width for image decoding.
*MCU WIDTH = Image Width/16
(input image width for JPEG decoder must be multiple of 32)
3.29.2 JPEG DECODER MCU HEIGHT Register (JDMHEIGHT)
Address : FFE1 0238h
Bit
31 : 12
11 : 0
R/W
R
W
Description
Default Value
Reserved.
-
0h
JPEG Decoder MCU HEIGHT
Set MCU height for image decoding.
*MCU HEIGHT = Image Height/16( YCBCR 420 Format)
*MCU HEIGHT = Image Height/8 ( YCBCR 422 Format)
(Input image height for JPEG decoder must be multiple of 16 for 420
format or multiple of 8 for 422 format)
3.29.3 JPEG DECODER Quantization Scale Control Register (JDQSC)
Address : FFE1 023Ch
Bit
31 : 12
11 : 0
R/W
R
W
Description
Default Value
Reserved.
-
0h
JPEG Quantization Scale Control
Scale quantization table value in the JPEG image header. With 64 as
base value, larger number increases Q table value and smaller number
decreases Q table value
If other value other than 64 is used, image distortion may occur under
the condition of different value setting.
3.29.4 JPEG DECODER Command Control Register (JDCOMCON)
Address : FFE1 0240h
Bit
31 : 3
2
R/W
R
W
Description
Default Value
Reserved.
-
0b
JPEG Decoder End IRQ Clear
1:End IRQ Clear
0:IDLE
JPEG Decoder End IRQ is used as JICIRQ source. This bit is set
when both JPEG Decoder End IRQ and JICIRQ are cleared.
After changing to ‘1’, this bit will toggle back to ‘0’ at the next clock.
After this bit is set to ‘1’, it is automatically cleared to ‘0’ at the next
clock.
*JPEG Decoder End IRQ must be cleared for JPEG decoder to
decode the next image
1
0
W
W
DECODING IMAGE FORMAT
1:YCBCR 420
0:YCBCR 422
Decoding Start
0b
0b
1:Decoding Start
0:IDLE
If JDENA Register[0] is set to ‘1’, JPEG decoder shall operate when
this bit changes to ‘1’.
The first JPEG Decoder FIFO Fill Request IRQ is initiated by setting
this bit to ‘1’.
After decoder starts the decoding operation, this bit will be cleared
automatically.
215
CONFIDENTIAL
Beijing Peak Microtech Co.Ltd.
ETC [ ETC ]
