
Bit Bit Name Function
29:20 Unused
19:16 VCP_ID3
VC payload ID for Stream 3
15:12 VCP_ID2
VC payload ID for Stream 2
11:8 VCP_ID1
VC payload ID for Stream 1
7:4 VCP_ID0
VC payload ID for Stream 0
3:1 Unused
0 MST_EN
Enable or disable MST
• 1 =MST framing
• 0 = SST framing
When you assert VCPTAB_UPD_FORCE, the sink forces the VC payload table contained in
DPRX_MST_VCPTAB0 through DPRX_MST_VCPTAB7 to be taken immediately into use.
When you assert VCPTAB_UPD_REQ, the sink requests the VC payload table contained in
DPRX_MST_VCPTAB0 to DPRX_MST_VCPTAB7 to be taken into use after the next ACT sequence is detected.
The VC Payload ID values (1–15) used for VCP_ID0 to VCP_ID3 are different from those used by the
DisplayPort source (1–63). The GPU must remap these values. The values used have to match those in the
VC Payload ID table—DPRX_MST_VCPTAB0 to DPRX_MST_VCPTAB7 registers.
MST controller status
Address: 0×00a1
Direction: RO
Reset: 0×00000000
Table 10-33: DPRX_MST_STATUS1 Bits
Bit Bit Name Function
31 Unused
30 VCPTAB_ACT_ACK
• 1 = ACT sequence detected and VC
payload updated
• 0 = No change to VC payload ID table
29:0 Unused
VCPTAB_ACT_ACK resets to 0 when VCPTAB_UPD_REQ deasserted. VCPTAB_ACT_ACK is set to 1 if
VCPTAB_UPD_REQ is asserted and the ACT sequence is detected, signalling that the table contained in
DPRX_MST_VCPTAB0 to DPRX_MST_VCPTAB7 registers have been taken into use.
DPRX_MST_VCPTAB0
VC Payload ID Table
UG-01131
2015.05.04
DPRX_MST_VCPTAB0
10-17
DisplayPort Sink Register Map and DPCD Locations
Altera Corporation
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