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PRELIMINARY
CAMERA INTERFACE
S3C6400X RISC MICROPROCESSOR
20-14
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
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
ISR region
ISR region
VSYNC
ISR region
ImgCptEn(cmd)
LastIRQEn
Capture O
Capture O
Capture O
Capture X
IRQ
Auto cleared
Last IRQ
High
ISR region
ISR region
ISR region
FrameCnt
0
1
2
3
3
0
1
Capture O
Capture O
(Frame_3)
(Frame_0)
(Frame_1)
(Frame_3)
(Frame_0)
Figure 20-11. Timing diagram for last IRQ (LastIRQEn is enabled)
ISR region
ISR region
ISR region
VSYNC
ISR region
ImgCptEn(cmd)
LastIRQEn
Capture O
Capture O
Capture O
Capture X
IRQ
Last IRQ
Low
ISR region
ISR region
ISR region
FrameCnt
0
1
2
2
3
3
0
Capture O
Capture O
(Frame_3)
(Frame_0)
(Frame_1)
(Frame_3)
(Frame_0)
Figure 20-12. Timing diagram for last IRQ (LastIRQEn is disabled)
V S Y N C
I R Q
A
B
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
B = 1 c y c le o f s y s t e m c lo c k
Figure 20-13. VSYNC & IRQ signals timing requirement