adv7189b Analog Devices, Inc., adv7189b Datasheet - Page 15

• Manufacturer Part Number: adv7189b
• Description: Multiformat Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

Manual Input Muxing
By accessing a set of manual override muxing registers, the
analog input muxes of the ADV7189B can be controlled
directly. This is referred to as manual input muxing.
Manual input muxing overrides other input muxing control
bits, for example, INSEL. The manual muxing is activated by
setting the ADC_SW_MAN_EN bit. It only affects the analog
switches in front of the ADCs.
This means if the settings of INSEL and the manual input
muxing registers (ADC0/1/2_sw) contradict each other, the
ADC0/ADC1/ADC2_sw settings apply and INSEL is ignored.
Manual input muxing controls only the analog input muxes.
INSEL[3:0] still has to be set so the follow-on blocks process
the video data in the correct format.
Table 10. Manual Mux Settings for All ADCs (SETADC_sw_man_en = 1)
ADC0_sw[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
ADC0 Connected To:
No Connection
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
No Connection
No Connection
AIN7
AIN8
AIN9
AIN10
AIN11
AIN12
No Connection
ADC1_sw[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Rev. B | Page 15 of 104
ADC1 Connected To:
No Connection
No Connection
No Connection
AIN3
AIN4
AIN5
AIN6
No Connection
No Connection
No Connection
No Connection
AIN9
AIN10
AIN11
AIN12
No Connection
This means INSEL must be used to tell the ADV7189B whether
the input signal is of component, YC, or CVBS format.
Restrictions in the channel routing are imposed by the analog
signal routing inside the IC; every input pin cannot be routed
to each ADC. Refer to
capabilities inside the chip. The three mux sections can be
controlled by the reserved control signal buses ADC0/ADC1/
ADC2_sw[3:0].
SETADC_sw_man_en, Manual Input Muxing Enable,
Address C4[7]
ADC0_sw[3:0], ADC0 Mux Configuration, Address 0xC3[3:0]
ADC1_sw[3:0], ADC1 Mux Configuration, Address 0xC3[7:4]
ADC2_sw[3:0], ADC2 Mux Configuration, Address 0xC4[3:0]
T able 10 explains the control words used.
1 4 6 H
ADC2_sw[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
F igure 6 for an overview on the routing
1 4 5 H
ADC2 Connected To:
No Connection
No Connection
AIN2
No Connection
No Connection
AIN5
AIN6
No Connection
No Connection
No Connection
AIN8
No Connection
No Connection
AIN11
AIN12
No Connection
ADV7189B