Cirrus Logic CDB4955A - Manual (Page 8)

CDB4954A/55A
8
J34 GND Jumper for Dig Video
Input Jumpered
Open
Gnd Connected
No Gnd Connect
J3
J13
J15
J17
J20
J21
J22
J23
J24
J25
J27
J29
J31
High/Low Impedance Select
NOTE: All Jumpers must be in
the same position, namely
High or Low. Also, only
change impedance loading
with the power off.
High
Low
High Impedance
Low Impedance
S1 DIP Switch for Stand Alone
Mode (See Table 3 ) (See Table 3 )
S2 Reset Switch - Resets the
CDB4954A/55A
Table 2. CBD4954 Jumper/Switch Settings (Continued)
Switch Purpose Position Function Selected
8 Clipping Input Signals ON
OFF
Clipping On
Clipping Off (CS4954 Con Reg 6, bit 6)
7 Pedestal Offset ON
OFF
Pedestal Offset = 7.5 IRE
Pedestal Offset = 0 IRE (CS4954 Con Reg 1, bit 1)
6 NTSC/PAL Format ON
OFF
PAL-B Mode
NTSC-M Mode
5 Not Used - -
1-4 Operating Modes
NOTE: OFF = 0
ON = 1
0000
1000
0100
1100
0010
1010
0110
1110
0001
1001
0101
1101
0011
1011
Display Color Bars (70% Amp, 70% Sat)
Display Luma Bars (70% Amp, 70% Sat)
Display a Luma Step
Display an Aqua Screen
Display a Luma Ramp (1 bit/2 pixels)
Display a Luma Ramp (1 bit/ pixel)
Display a Luma Ramp (2 bit/ pixel)
Display a Luma Ramp (4 bit/ pixel)
Select Parallel Video Input as External Source
Select Serial Video Input as External Source
Display Video from Flash Block 1 (Cirrus Logo - NTSC)
Display Video from Flash Block 2 (Cirrus Logo - PAL)
Display Video from Flash Block 3
Select the D656 Bus Header(J32) as external video
input source.
Table 3. DIP Switch Settings