According to #32 http://subversion.ffado.org/ticket/36

Summary
-------

Nr | AddressType     | Direction | SubUnitType | SubUnitId | FunctionBlockType | FunctionBlockId | Id   | Type         |Name
---+-----------------+-----------+-------------+-----------+-------------------+-----------------+------+--------------+------
 0 |         subunit |     Input |       Audio |      0x00 |              0xff |            0xff | 0x00 |      Digital | ASU Audio Input Ext SPDIF
 1 |   functionblock |     Input |       Audio |      0x00 |              0x81 |            0x01 | 0x00 |      Digital | FB Audio In Ext SPDIF
 2 |   functionblock |    Output |       Audio |      0x00 |              0x81 |            0x01 | 0x00 |      Digital | FB Audio In Ext SPDIF
 3 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x00 |    IsoStream | MSU Compound Input
 4 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x01 |      Digital | MSU Audio Input SPDIF
 5 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x02 |      Digital | MSU Audio Input ADAT1
 6 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x03 |      Digital | MSU Audio Input ADAT2
 7 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x04 |      Digital | MSU Audio Input ADAT3
 8 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x05 |      Digital | MSU Audio Input ADAT4
 9 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x06 |         MIDI | MSU Midi Input
10 |         subunit |     Input |       Music |      0x00 |              0xff |            0xff | 0x07 |         Sync | MSU Synch Input
11 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x00 |    IsoStream | MSU Compound Output
12 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x01 |      Digital | MSU Audio Output ADAT1
13 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x02 |      Digital | MSU Audio Output ADAT2
14 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x03 |      Digital | MSU Audio Output ADAT3
15 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x04 |      Digital | MSU Audio Output ADAT4
16 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x05 |       Analog | MSU Audio Output 1/2
17 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x06 |      Digital | MSU Audio Output SPDIF
18 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x07 |         MIDI | MSU Midi Output
19 |         subunit |    Output |       Music |      0x00 |              0xff |            0xff | 0x08 |         Sync | MSU Synch Output
20 |             PCR |     Input |        Unit |      0xff |              0xff |            0xff | 0x00 |    IsoStream | PCR Compound Input
21 |             PCR |     Input |        Unit |      0xff |              0xff |            0xff | 0x01 |         Sync | PCR Synch Input
22 |             PCR |    Output |        Unit |      0xff |              0xff |            0xff | 0x00 |    IsoStream | PCR Compound Output
23 |             PCR |    Output |        Unit |      0xff |              0xff |            0xff | 0x01 |         Sync | PCR Synch Output
24 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x00 |         MIDI | Ext Midi Input
25 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x01 |      Digital | Ext SPDIF Input
26 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x02 |      Digital | Ext ADAT/S-MUX Input1
27 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x03 |      Digital | Ext ADAT/S-MUX Input2
28 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x04 |      Digital | Ext ADAT/S-MUX Input3
29 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x05 |      Digital | Ext ADAT/S-MUX Input4
30 |        external |     Input |        Unit |      0xff |              0xff |            0xff | 0x06 |         Sync | Ext WClock Input
31 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x00 |         MIDI | Ext Midi Output
32 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x01 |      Digital | Ext ADAT/S-MUX Output1
33 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x02 |      Digital | Ext ADAT/S-MUX Output2
34 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x03 |      Digital | Ext ADAT/S-MUX Output3
35 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x04 |      Digital | Ext ADAT/S-MUX Output4
36 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x05 |       Analog | Ext Audio Output 1/2
37 |        external |    Output |        Unit |      0xff |              0xff |            0xff | 0x06 |      Digital | Ext SPDIF Output
Connections
-----------
digraph avcconnections {
	"(0) ASU Audio Input Ext SPDIF" -> "(1) FB Audio In Ext SPDIF"
	"(20) PCR Compound Input" -> "(3) MSU Compound Input"
	"(25) Ext SPDIF Input" -> "(4) MSU Audio Input SPDIF"
	"(26) Ext ADAT/S-MUX Input1" -> "(5) MSU Audio Input ADAT1"
	"(27) Ext ADAT/S-MUX Input2" -> "(6) MSU Audio Input ADAT2"
	"(28) Ext ADAT/S-MUX Input3" -> "(7) MSU Audio Input ADAT3"
	"(29) Ext ADAT/S-MUX Input4" -> "(8) MSU Audio Input ADAT4"
	"(24) Ext Midi Input" -> "(9) MSU Midi Input"
	"(19) MSU Synch Output" -> "(10) MSU Synch Input"
	"(11) MSU Compound Output" -> "(22) PCR Compound Output"
	"(12) MSU Audio Output ADAT1" -> "(32) Ext ADAT/S-MUX Output1"
	"(13) MSU Audio Output ADAT2" -> "(33) Ext ADAT/S-MUX Output2"
	"(14) MSU Audio Output ADAT3" -> "(34) Ext ADAT/S-MUX Output3"
	"(15) MSU Audio Output ADAT4" -> "(35) Ext ADAT/S-MUX Output4"
	"(16) MSU Audio Output 1/2" -> "(36) Ext Audio Output 1/2"
	"(17) MSU Audio Output SPDIF" -> "(37) Ext SPDIF Output"
	"(18) MSU Midi Output" -> "(31) Ext Midi Output"
	"(19) MSU Synch Output" -> "(23) PCR Synch Output"
	"(1) FB Audio In Ext SPDIF" -> "(Feature FB, ID 1)"
	"(Feature FB, ID 1)" -> 	"(2) FB Audio In Ext SPDIF"
	"(0) ASU Audio Input Ext SPDIF" [color=green,style=filled];
	"(1) FB Audio In Ext SPDIF" [color=yellow,style=filled];
	"(2) FB Audio In Ext SPDIF" [color=yellow,style=filled];
	"(3) MSU Compound Input" [color=green,style=filled];
	"(4) MSU Audio Input SPDIF" [color=green,style=filled];
	"(5) MSU Audio Input ADAT1" [color=green,style=filled];
	"(6) MSU Audio Input ADAT2" [color=green,style=filled];
	"(7) MSU Audio Input ADAT3" [color=green,style=filled];
	"(8) MSU Audio Input ADAT4" [color=green,style=filled];
	"(9) MSU Midi Input" [color=green,style=filled];
	"(10) MSU Synch Input" [color=green,style=filled];
	"(11) MSU Compound Output" [color=green,style=filled];
	"(12) MSU Audio Output ADAT1" [color=green,style=filled];
	"(13) MSU Audio Output ADAT2" [color=green,style=filled];
	"(14) MSU Audio Output ADAT3" [color=green,style=filled];
	"(15) MSU Audio Output ADAT4" [color=green,style=filled];
	"(16) MSU Audio Output 1/2" [color=green,style=filled];
	"(17) MSU Audio Output SPDIF" [color=green,style=filled];
	"(18) MSU Midi Output" [color=green,style=filled];
	"(19) MSU Synch Output" [color=green,style=filled];
	"(20) PCR Compound Input" [color=coral,style=filled];
	"(21) PCR Synch Input" [color=coral,style=filled];
	"(22) PCR Compound Output" [color=coral,style=filled];
	"(23) PCR Synch Output" [color=coral,style=filled];
	"(24) Ext Midi Input" [color=slateblue,style=filled];
	"(25) Ext SPDIF Input" [color=slateblue,style=filled];
	"(26) Ext ADAT/S-MUX Input1" [color=slateblue,style=filled];
	"(27) Ext ADAT/S-MUX Input2" [color=slateblue,style=filled];
	"(28) Ext ADAT/S-MUX Input3" [color=slateblue,style=filled];
	"(29) Ext ADAT/S-MUX Input4" [color=slateblue,style=filled];
	"(30) Ext WClock Input" [color=slateblue,style=filled];
	"(31) Ext Midi Output" [color=slateblue,style=filled];
	"(32) Ext ADAT/S-MUX Output1" [color=slateblue,style=filled];
	"(33) Ext ADAT/S-MUX Output2" [color=slateblue,style=filled];
	"(34) Ext ADAT/S-MUX Output3" [color=slateblue,style=filled];
	"(35) Ext ADAT/S-MUX Output4" [color=slateblue,style=filled];
	"(36) Ext Audio Output 1/2" [color=slateblue,style=filled];
	"(37) Ext SPDIF Output" [color=slateblue,style=filled];
}
Use "dot -Tps FILENAME.dot -o FILENAME.ps" to generate graph