CCS Technical Documentation
Troubleshooting - Baseband
RH-27
Issue 1 11/2003 Confidential
©
2003
Nokia Corporation
Page 23
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
Chip-select CSX enables and disables the camera serial bus. CSX is active low. An addi-
tional function of CSX during the power up sequence is to determine the communication
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 CSX is inactive as well.
RxDa data-length is 8 bits + D/C-bit. The first bit to be received is D/C-bit which indi-
cates to the camera the status of following 8 bit data. In the case of command data to
camera the D/C-bit is low ('0'). The camera must not react to received data if D/C-bit is
high ('1').
TxDa data-length is 8 bits + TxEnd-bit. The first bit to be transmitted is the TxEnd-bit
TxDa
H = 1.75
L = -18m
H:0.8xVIO
L:0
H:VIO
L:0.2xVIO
V
Data to transmit, camera
interrupt (active low)
RxDa
H = 1.76
L = -11m
H:0.7xVIO
L:0
H:VIO
L:0.3xVIO
V
Data 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 5: 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 4: DC characteristics
Signal name
Measured
value (V)
Min
Typical
Max
Unit
Description
