HDMI1.4测试案例
HDMI（High Definition MultimediaInterface，高清多媒体接口）是一种全数字化视频和声音发送接口，可以发送未压缩的音频和视频信号。HDMI可用于机顶盒、DVD播放机、个人计算机、电视、游戏主机、综合放大数字音响和电视机等设备。下面我们就以显卡上的HDMI接口的测试案例与大家进行分享。
一、测试背景:
L客户有一款显卡在我处进行测试，该显卡有一个HDMI接口，客户需求是测试1920x1080@60Hz的分辨率。以下测试介绍为该接口的HDMI1.4测试介绍。
二、测试设备介绍
HDMI测试主要用到以下测试设备及：
| No. | Equipment | Model | Remark |
| 1 | Oscilloscope | Tektronix DPO72304DX | |
| 2 | LRC Tester | 3522-50 | |
| 3 | Differential Probe | Tektronix P7313SMA*4 | |
| 4 | Test Fixture | Wilder Test Fixture | |
| 5 | Test Program | HDMI Compliance Test Software TDSHT3_V5.3.5 |
三、测试内容介绍：
HDMI 1.4 Compliance Test
| No. | Test Name | Lanes | Spec Range | Measure Value | Result |
| 1 | 7-9 : Source Clock Jitter | CK | Clock Jitter < 0.25*Tbit; | 0.033*Tbit | Pass |
| 2 | 7-10 : Source Eye Diagram | CK - D0 | Data Jitter < 0.3*Tbit; | 0.1*Tbit | Pass |
| 3 | 7-6 : Source Inter-Pair Skew | D0 - D1 | Skew < 0.2*TPixel; | 0.001*TPixel | Pass |
| 6 | 7-4 : Source Rise Time | D0 | 75.00ps < TRISE; | 185.97ps | Pass |
| 7 | 7-4 : Source Fall Time | D0 | 75.00ps < TFALL; | 180.97ps | Pass |
| 8 | 7-8 : Max Duty Cycle | CK | Max Duty Cycle < 60.0%; | 50.70% | Pass |
| 9 | 7-8 : Min Duty Cycle | CK | 40.0% < Min Duty Cycle; | 49.92% | Pass |
| 10 | 7-2 : Source Low Amplitude +(Supported Sink <= 165MHz) | D0+ | 2.700V < VL < 2.900V; | 2.7019V | Pass |
| 11 | 7-2 : Source Low Amplitude -(Supported Sink <= 165MHz) | D0- | 2.700V < VL < 2.900V; | 2.7188V | Pass |
| 12 | 7-7 : Source Intra-Pair Skew | D0 | Skew < 0.15*Tbit; | 0.033*Tbit | Pass |
7-9 : Source Clock Jitter : CK
7-10 : Source Eye Diagram : CK - D0
7-4 : Source Rise Time : D0
7-4 : Source Fall Time : D0
7-8 : Max Duty Cycle : CK
7-8 : Min Duty Cycle : CK
7-2 : Source Low Amplitude +(Supported Sink <= 165MHz) :D0+
7-2 : Source Low Amplitude +(Supported Sink <= 165MHz) :D0-
7-7 : Source Intra-Pair Skew : D0
Test ID 7-11: +5V Power TestNote: Connect DC load to +5Vpower.
| HDMI output+5V Power | Load Current: 0mA | Load Current: 55mA | Pass/Fail |
| Spec | 4.8~5.3V | 4.8~5.3V | |
| +5V Voltage Measured Result | 5.011V | 4.988V | Pass |
Test ID 7-12: Hot Plug Detect
| System power on. Don't connect HDMI cable. 1. Connect Hot_Plug Detect Pin to one 1.2k Ohms resistance, thenconnect the other side of the resistance to a DC power supply V+(In series). 2. Connect Ground pin to DC power supply V-. 3. Adjust DC power voltage, then test Hot_Plug voltage. | ||||
| Note: 1. Adjust to DC Power of 2.4V and 5.3V level. 2. Adjust to DC Power of 0.0V and 0.4V level. 3. HDMI must display when DUT ON. |
| High level | Set DC 2.4V | Set DC 5.3V | Pass/Fail |
| Spec | 2.0~5.3V | 2.0~5.3V | |
| Measured Result | 2.392V | 5.288V | Pass |
| Low level | Set DC 0.0V | Set DC 0.4V | Pass/Fail |
| Spec | 0~0.8V | 0~0.8V | |
| Measured Result | 0.001V | 0.399V | Pass |
Test ID 7-3: V(OFF)
Test ID 7-13: DDC/CEC Line Capacitance and Voltage
测试信号 | 测试项目 | 规格(小值) | 规格(大值) | 单位 | 测试值 | 测试结果 |
| DDC-SCL | Ring up | - | 1.5 | V | 0.504 | Pass |
| Ring down | 4.5 | - | V | 4.928 | Pass | |
| Vhigh | - | 5.5V | V | 5.048 | Pass | |
| Vlow | -0.5V | - | V | 0.344 | Pass | |
| Frequency | - | 100 | KHz | 98.43 | Pass | |
| HighTime | 4.7 | - | µs | 4.78 | Pass | |
| Low Time | 4 | - | µs | 5.06 | Pass | |
| RiseTime | - | 1000 | ns | 256 | Pass | |
| Fall Time | - | 300 | ns | 48 | Pass | |
| Capacitance | - | 50 | pF | 24.621 | Pass | |
| DDC-SDA | Ring up | - | 1.5 | V | 0.48 | Pass |
| Ring down | 4.5 | - | V | 4.944 | Pass | |
| Vhigh | - | 5.5V | V | 5.112 | Pass | |
| Vlow | -0.5V | - | V | 0.28 | Pass | |
| RiseTime | - | 1000 | ns | 252 | Pass | |
| Fall Time | - | 300 | ns | 50 | Pass | |
| tSU;DAT | 250 | - | ns | 4500 | Pass | |
| tHD;DAT | 0 | 3.45 | µs | 0.29 | Pass | |
| tSU;STA | 4.7 | µs | 14.97 | Pass | ||
| tHD;STA | 4 | - | µs | 5.04 | Pass | |
| tSU;STO | 4 | - | µs | 10.12 | Pass | |
| tBUF | 4.7 | - | µs | 36 | Pass | |
| Capacitance | - | 50 | pF | 26.401 | Pass | |
| CEC | Capacitance | - | 150 | pF | 3.22 | Pass |
Frequency SCL-VOL
SDA-tHD;STA SDA-tSU;STO
四、说明：
以上测试内容适用于所有HDMI OUT接口，测试接口必须为标准HDMI接口，包含以下接口类型：HDMI A、HDMI C(Mini HDMI)、HDMI D (Micron HDMI)。