Theory of Operation
17
Phoenix PC-1280 USB Digital Camera User’s Guide
Revision 1.1
4
Theory of Operation
The Phoenix PC-1280 USB Digital Camera consists of camera
hardware and support software (device driver and core DLL).
4.1 Hardware Block Diagram
The PC-1280 Camera is implemented with a CMOS image sensor
chip, a FPGA chip, a memory buffer attached to the FPGA, an USB
FYH interface and other supporting circuits. To guarantee the vid-
eo capture performance, the core functions are all designed in the
FPGA. A built-in memory buffer of SDRAM provides sufficient
buffering to prevent image data lost even under severe USB Bus
traffic. Figure 4.1 shows the Block Diagram of the PC-1280 Cam-
era Hardware.
Figure 4.1: PC-1280 Camera Hardware Block Diagram
S D R A M B u f f e r
( 1 6 M B )
C M O S
I m a g e
S e n s o r
( 1 2 8 0 x
1 0 2 4 )
F P
C o m p .
1 0 B i t
L U T
C o l o r
S p a c e
C o n v .
T r a n s f e r
C o n t r o l
G P
I / O
C a p t u r e
C o n t r o l
M i s c .
C o n t r o l
1 0 / 8 / 1 6
U S B
B u s
T r i g
S t r o b e
1 0 / 8 / 1 6
F P G A C h i p
P C 1 2 8 0 B D . C F L
R E V . 1 . 0 1 1 / 1 7 / / 0 4
1 0
1 0
U S B
P H Y
