How to use two pices of ad8197 made a dual 8:1 switch，can I just link the output signals (TMDS、HDCP、DDC) together？
（sorry，I have not writen English for morethan ten years，so，my English is bad。）
Yes you can. Two AD8197s support HDMI/DVI dual-link. These details are provided in Page14 of AD8197 datasheet.
AD8197 switching logic has three modes: quad mode (a quad 4:1 switch), dual mode (a dual…
AD8197 switching logic has three modes: quad mode (a quad 4:1 switch), dual mode (a dual 8:1 switch), and single mode (one 16:1 switch). The primary function of the AD8197 is to switch one of four (HDMI or DVI) single-link sources to one output.Each HDMI/DVI link consists of four differential, high speed channels and four auxiliary single-ended, low speed control signals.Note - Data Rate: Supports 250 Mbps to 2.25 Gbps data rates Supports 25 MHz to 225 MHz pixel clocks Equalized inputs for operation with long HDMI cables (20 meters at 2.25 Gbps)
thanks,if i want to build a large arrays ,16 dvi-d input and 1 dvi-d output, can the ad8197 support this idea? i Designed the logic block diagram，witch method can i chose？
I beieve, method B is more suitable,1.Two AD8197Bs support HDMI/DVI dual link2. The AD8197B is an HDMI/DVI switch, featuring equalized TMDS inputs and pre-emphasized TMDS outputs.It is in-tended for use as a 4:1 switch in systems with long cable runs on both the input and/or the output, and is fully HDMI 1.3 receive-compliant.
Note: AD8197 behaves as a single 16:1 TMDS channel multiplexer; one of the 16 input channels is routed to all of the outputs. Select which input channel is routed to the outputs by programming the HS_CH bits in the high speed device modes register in accordance with the switch mapping listed in Table 10. This mode is only accessible through the serial control interface.
Method B is not correct. The AD8197 is a 4-1 HDMI switch which means you only need 3 total devices. 2 for the dual 4-1 input muxes and 1 for to select the input device. Figure 31 shows how to layout a 4-1 HDMI mux.