Datasheet

SN75DP130
www.ti.com SLLSE57D –APRIL 2011–REVISED JULY 2013
LINK TRAINING AND DPCD DESCRIPTION
The SN75DP130 monitors the auxiliary interface access to DisplayPort Configuration Data (DPCD) registers
during Link Training in DP mode to select the output voltage swing V
OD
, output pre-emphasis, and the EQ setting
of the Main Link. The AUX monitor for SN75DP130 supports Link Training in 1Mbps Manchester mode, and is
disabled during TMDS mode (CAD_SNK=VIH).
The AUX channel is further monitored for the DisplayPort D3 standby command.
The DPCD registers monitored by SN75DP130 are listed in Table 6. Bit fields not listed are reserved and values
written to reserved fields are ignored.
Table 6. DPCD Registers Utilized by the SN75DP130 AUX Monitor
ADDRESS NAME DESCRIPTION
Bits 7:0 = Link Bandwidth Setting
Write Values:
06h – 1.62 Gbps per lane
0Ah – 2.7 Gbps per lane (default)
14h – 5.4 Gbps per lane
00100h LINK_BW_SET
Note: any other value is reserved; the SN75DP130 will revert to 5.4 Gbps operation when any other value is
written
Read Values:
00h – 1.62 Gbps per lane
01h – 2.7 Gbps per lane (default)
02h – 5.4 Gbps per lane
Bits 4:0 = Lane Count
Write Values:
00h – All lanes disabled (default)
01h – One lane enabled
02h – Two lanes enabled
04h – Four lanes enabled
00101h LANE_COUNT_SET
Note: any other value is invalid and disables all Main Link output lanes
Read Values:
00h – All lanes disabled (default)
01h – One lane enabled
03h – Two lanes enabled
0Fh – Four lanes enabled
Write Values:
Bits 1:0 = Output Voltage V
OD
Level
00 – Voltage swing level 0 (default)
01 – Voltage swing level 1
10 – Voltage swing level 2
11 – Voltage swing level 3
Bits 4:3 = Pre-emphasis Level
00 – Pre-emphasis level 0 (default)
01 – Pre-emphasis level 1
10 – Pre-emphasis level 2
11 – Pre-emphasis level 3
Note: the following combinations are not allowed for bits [1:0]/[4:3]: 01/11, 10/10, 10/11, 11/01, 11/10, 11/11;
00103h TRAINING_LANE0_SET setting to any of these invalid combinations disables all Main Link lanes until the register value is changed
back to a valid entry
Read Values:
Bits 1:0 = Output Voltage V
OD
Level
00 – Voltage swing level 0 (default)
01 – Voltage swing level 1
10 – Voltage swing level 2
11 – Voltage swing level 3
Bits 3:2 = Pre-emphasis Level
00 – Pre-emphasis level 0 (default)
01 – Pre-emphasis level 1
10 – Pre-emphasis level 2
11 – Pre-emphasis level 3
00104h TRAINING_LANE1_SET Sets the V
OD
and pre-emphasis levels for lane 1
00105h TRAINING_LANE2_SET Sets the V
OD
and pre-emphasis levels for lane 2
00106h TRAINING_LANE3_SET Sets the V
OD
and pre-emphasis levels for lane 3
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