About 440p_ComExpress CN1B B055

I am investigating the connection relationship between Kingfisher (* 1) and StarterKit (* 2). (* 1), B055 of 440p_ComExpress is named IrqEXT0xE8 and it is connected with INT of U11 (TCA9539QPWRQ1).
(* 2), B055 of 440p_ComExpress is named AVB_AVTP_MATCH / SCL5 and is connected to B11 (AVB_AVTP_MATCH_A) of R-Car SiP.
How will it work (how do you communicate) with B055 when connecting (* 1) and (* 2) together?

(*1)Kingfisher(SBEV-RCAR-KF-M05)
http://www.shimafuji.co.jp/DL/EN/InfotainmentCarrierBoard/files/sbev-rcar-kf-m05_Rev3.2.pdf
440p_ComExpress CN1B B055

(*2)StarterKit(RTP0RC77951SKBX010SA01)
https://www.renesas.com/en-us/doc/products/rcar/R-Car_StarterKit_Gen3_SCH_Rev.110.pdf
440p_ComExpress CN1B B055

ryuohno (talk)