Datasheet
ADV7189B
Rev. B | Page 15 of 104
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.
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
145HFigure 6 for an overview on the routing
capabilities inside the chip. The three mux sections can be
controlled by the reserved control signal buses ADC0/ADC1/
ADC2_sw[3:0].
146HTable 10 explains the control words used.
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]
Table 10. Manual Mux Settings for All ADCs (SETADC_sw_man_en = 1)
ADC0_sw[3:0] ADC0 Connected To: ADC1_sw[3:0] ADC1 Connected To: ADC2_sw[3:0] ADC2 Connected To:
0000 No Connection 0000 No Connection 0000 No Connection
0001 AIN1 0001 No Connection 0001 No Connection
0010 AIN2 0010 No Connection 0010 AIN2
0011 AIN3 0011 AIN3 0011 No Connection
0100 AIN4 0100 AIN4 0100 No Connection
0101 AIN5 0101 AIN5 0101 AIN5
0110 AIN6 0110 AIN6 0110 AIN6
0111 No Connection 0111 No Connection 0111 No Connection
1000 No Connection 1000 No Connection 1000 No Connection
1001 AIN7 1001 No Connection 1001 No Connection
1010 AIN8 1010 No Connection 1010 AIN8
1011 AIN9 1011 AIN9 1011 No Connection
1100 AIN10 1100 AIN10 1100 No Connection
1101 AIN11 1101 AIN11 1101 AIN11
1110 AIN12 1110 AIN12 1110 AIN12
1111 No Connection 1111 No Connection 1111 No Connection