Samsung S3C6400X User Manual page 579

CAMERA INTERFACE
TIMING DIAGRAM FOR LAST IRQ (CAMERA CAPTURE MODE)
IRQ except LastIRQ is generated before image capturing. Last IRQ which means camera signal capture-end can
be set by following timing diagram. LastIRQEn is auto-cleared and, as mentioned, SFR setting in ISR is for next
frame command. Therefore, for adequate last IRQ, you must follow next sequence between LastIRQEn and
ImgCptEn/ImgCptEn_CoSc/ImgCptEnPrSC. It is recommended that ImgCptEn/ImgCptEn_CoSc/ImgCptEnPrSC
is set at same time and at last of SFR setting in ISR. FrameCnt which is read in ISR, means next frame count. On
following diagram, last captured frame count is "1". That is, Frame 1 is the last-captured frame among frame 0~3.
FrameCnt is increased by 1 at IRQ rising.
- Camera input capture path
ISR region
VSYNC
ImgCptEn(cmd)
LastIRQEn
IRQ
FrameCnt
3
Capture O
(Frame_3)
Figure 20-11. Timing diagram for last IRQ (LastIRQEn is enabled)
ISR region
VSYNC
ImgCptEn(cmd)
LastIRQEn
IRQ
FrameCnt
3
Capture O
(Frame_3)
Figure 20-12. Timing diagram for last IRQ (LastIRQEn is disabled)
V S Y N C
I R Q
Preliminary product information describe products that are in development,
20-14
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
ISR region ISR region
Auto cleared
0 1
Capture O
(Frame_0)
ISR region ISR region
0 1
Capture O
(Frame_0)
A = 8 c y c le o f p i x e l c lo c k + 3 c y c le o f s y s t e m c lo c k
A
B = 1 c y c le o f s y s t e m c lo c k
B
Figure 20-13. VSYNC & IRQ signals timing requirement
ISR region ISR region
Last IRQ
High
2 3
Capture O Capture X
(Frame_1)
ISR region ISR region
Last IRQ
Low
2 2
Capture O Capture X
(Frame_1)
S3C6400X RISC MICROPROCESSOR
ISR region
0 1
Capture O Capture O
(Frame_3) (Frame_0)
ISR region
3 0
Capture O Capture O
(Frame_3) (Frame_0)
ISR region
ISR region