您好、专家、
我的客户在以下 E2E 课程中遇到类似的问题
输出不稳定。 屏幕每隔几秒闪烁一次。
客户尝试在以下情况下进行检查、
480p:好的
720p:好的
1080p:NG
4K30p:好的
他们仅发现1080p 条件存在问题。
您对此问题的原因有什么想法吗? 为什么此问题仅发生 在1080p、59.94fps 时?
谢谢
穆克
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您好!
当在1080p 59.94fps 时出现闪烁噪声时、寄存器转储值如下。
第0页
0 1 2 3 4 5 6 7 8 9 A b c d e f 0123456789abcdef
00:54 4D 44 53 31 38 31 20 01 C2 B3 18 00 00 0f TMDS181????????
10:00 00 00 00 80 00 70 00 00 00 00 00 00 00 00 00 00 00 00 ?.........
20:0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00..........
第1页
0 1 2 3 4 5 6 7 8 9 A b c d e f 0123456789abcdef
00:C3 01 3f 00 a0 00 00 00 02 00 33 00 13 00 ??????????????????????
10:0f 70 00 07 00 00 00 00 00 00 00 00 00 00 00 00 ?p?...........
20:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30:0E 70 01 00 00 00 00 08 00 08 04 06 00 00 ?p?… ??????..
40:80 80 80 80 47 00 00 00 ff 01 e0 f0 03 20 47 34 ?????G....??? G4
50:00 00 00 00 00 00 00 00 00 00 00 00 40 40 40 40 40 @@@@μ A
60:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80:00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 一
90:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
A0:00 00 fa 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00... ?..........
B0:5e 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^…
C0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
D0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 ........ ?
您好!
我注意到您要将0x18设置为寄存器0x0B、这会将 TX_TERM 设置为0x11 (75到150欧姆)。 0x11的 TX_TERM 用于 HDMI2.0。 对于1080分辨率、您可以将其设置为0x01吗?
在您之前的回复中、 Hsync 和 Vsync 信号每10秒受到一次干扰、您能澄清一下吗? 直接在拉电流和灌电流之间连接时是否会出现这种情况?
谢谢
David
数据表中规定了以下内容:
发送端接控制
TX_TERM_CTL = H、无发送终止
TX_TERM_CTL = L、Ω 端接阻抗约为75至150 Ω
TX_TERM_CTL =无连接、自动选择端接阻抗
数据速率(DR)> 3.4Gbps–75至150 Ω 差分近端终端
2Gbps > DR < 3.4Gbps–150
对于 HDMI1.4标准、
1080p 为148.5MHz x 8位=3.564Gbps
4K30p 为297MHz x 8位= 7.128Gbps
我认为 TX_TERM 为0x11。
我将在下周的0x01处尝试它。
当源端和接收端直接连接时、HSYNC 信号和 VSYNC 信号会受到干扰、这一点未得到确认。
1080p 时、1.485Gbps <2Gbps、因此终端不是0x01、不是0x00?
我在1080p 时尝试了0x00和0x01、但两者都有同步干扰。
我还转储了寄存器。
0x0B 0x08
第0页
0 1 2 3 4 5 6 7 8 9 A b c d e f 0123456789abcdef
00:54 4D 44 53 31 38 31 20 01 C2 93 08 61 00 0f TMDS181?????
10:00 00 00 00 80 00 70 00 00 00 00 00 00 00 00 00 00 00 00 ?.........
20:0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00..........
第1页
0 1 2 3 4 5 6 7 8 9 A b c d e f 0123456789abcdef
00:C3 01 3f 00 a0 00 00 00 02 00 33 00 13 00 ??????????????????????
10:0f 50 00 07 01 00 00 00 00 00 00 00 00 00 00 00 00?P.?..........
20:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30:0E 70 01 00 00 00 00 08 00 08 04 06 00 00 ?p?… ??????..
40:80 80 80 57 00 00 00 00 ff 01 F8 80 01 20 07 00 ????????? ?。
50:00 00 00 00 00 00 00 00 00 00 00 00 40 40 40 40 40 @@@@μ A
60:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80:00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 一
90:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
A0:00 00 fa 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00... ?..........
B0:5e 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^…
C0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
D0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 ........ ?
0x0B 0x00
第0页
0 1 2 3 4 5 6 7 8 9 A b c d e f 0123456789abcdef
00:54 4D 44 53 31 38 31 20 01 C2 93 00 61 00 0f TMDS181??????
10:00 00 00 00 80 00 70 00 02 00 00 00 00 00 00 00 00 00 … ??............
20:0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00..........
第1页
0 1 2 3 4 5 6 7 8 9 A b c d e f 0123456789abcdef
00:C3 01 3f 00 a0 00 00 00 02 00 33 00 13 00 ??????????????????????
10:0f 40 00 07 01 00 00 00 00 00 00 00 00 00 00 00 00 @…………………………………………
20:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30:0E 70 01 00 00 00 00 08 00 08 04 06 00 00 ?p?… ??????..
40:80 80 80 A3 00 00 00 ff 07 f0 01 20 07 00 ???? ???? ?。
50:00 00 00 00 00 00 00 00 00 00 00 00 40 40 40 40 40 @@@@μ A
60:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80:00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 一
90:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
A0:00 00 fa 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00... ?..........
B0:5e 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^…
C0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
D0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 ........ ?
您好!
我仍然会在寄存器0x0B (0xC3)中启用自适应 EQ。 但是、查看这两个寄存器转储、我确实看不到任何问题。 两个转储都显示 TMDS181处于重定时器模式(第1页、寄存器0x00 -> 0xC3)。 TMDS181检测输入时钟(第1页、寄存器0xB1位7 -> 1)。 输入时钟频率正确(第1页、寄存器0xB0 -> 0x5E、5x25+25 = 150MHz)。
HSYNC 和 VSYNC 嵌入在 TMDS 数据中、TMDS181不会影响 HSYNC 和 VSYNC、因此我不知道 TMDS181如何导致同步干扰。 您是否有 HSYNC 和 VSYNC 的示波器测量?
谢谢
David