User Guide

RM-11
Troubleshooting - Baseband CC Technical Documentation
Page 26 ©2004 Nokia Corporation Confidential Issue 1 02/2004
Note: H indicates high signal level and L indicates low signal level.
AC Measurements
Note: DaClk frequency will not exceed ExtClk/2.
Timing Measurements
Signal Descriptions
The chip-select CSX enables and disables the camera serial bus. The CSX is active low. An
additional function of CSX during the power-up sequence is to determine the communi-
cation mode of the HWA (UIF or CCI/CCP).
DaClk is a serial data clock and is typically set to ExtClk/2. The clock can be driven low
when data is not transmitted, but may be running when the CSX is inactive as well.
RxDa data length is 8 bits + D/C-bit. The first bit to be received is a D/C-bit, which
indicates to the camera the status of the following 8 bit data. The D/C-bit is low ('0') in
the case of command data to the camera. The camera must not react to the received
data if the D/C-bit is high ('1').
TxDa data length is 8 bits + TxEnd-bit. The first bit to be transmitted is the TxEnd-bit,
which indicates if the data is the last byte from the image frame. When a byte is the last
byte of an image frame from the camera, the TxEnd-bit is set high ('1'). Otherwise the
RxDa H = 1.76
L = -11m
H: 0.7xVIO
L: 0
H: VIO
L: 0.3xVIO
VData to receive
ExtClk H = 1.75
L = -12m
0.5Vp-p 1Vp-p VIOp-p V All modes
VCtrl N/A H: 0.7xVIO
L: 0
H: VIO
L: 0.3xVIO
V Logic O: shutdown
Table 6: AC characteristics
Signal
name
Measured
value (V)
Min Typical Max Unit Description
DaCLK F = 4.799
D = 49.4
4.69
45/55
4.8
50/50
4.81
55/45
MHz
%
Frequency
Duty cycle
ExtClk F = 9.6
D = 49.3
9.59
45/55
9.6
50/50
9.69
45/55
MHz
%
External system clock
(mode 4)
Table 5: DC characteristics (Continued)
Signal
name
Measured
value (V)
Min Typical Max Unit Description