10.3.1 Compliance Testing

Compliance testing is very system design specific. Properly designing the system and configuring the DP159 can help pass transmitter compliance for the system. The following information is the starting point to help prepare for compliance test. As each system is different there are many features in the DP159 to help tune the circuit. These include V_OD adjust by changing the Vsadj resistor value or using I²C. Other knobs to turn are pre/de-emphasis and slew rate control. Passing both HDMI2.0 and HDMI1.4b compliance is easier to accomplish when using I²C as this provides more fine tuning capability.

For the SNx5DP159RGZ:

Pin Strapping

HDMI2.0 & HDMI1.4b

Vsadj Resistor = 7.06-kΩ

PRE_SEL = NC for 0-dB

TX_TERM_CTL = NC for Auto Select

SLEW_CTL = NC

I²C Control

HDMI2.0 & HDMI1.4b

Vsadj Resistor = 7.06 kΩ

PRE_SEL = Reg0Ch[1:0] = 00 (labeled HDMI_TWPST)

TX_TERM_CTL =

• Reg0Bh[4:3] = 00 → No term; HDMI1.4b < 2Gbps (This may be best value for all HDMI1.4b)
• Reg0Bh[4:3] = 01 → 150 to 300 Ω; HDMI1.4b > 2Gbps
• Reg0Bh[4:3] = 11 → 75 to 150 Ω; HDMI2.0

SLEW_CTL = Reg0Bh[7:6] = 10

For the SNx5DP159RSB:

Pin Strapping

HDMI2.0 and HDMI1.4b

Vsadj Resistor = 6.5 kΩ

PRE_SEL = L for –2 dB

TX_TERM_CTL = NC for Auto Select

SLEW_CTL = NC

I²C

HDMI2.0

Vsadj Resistor = 6.5 kΩ

PRE_SEL = Reg0Ch[1:0] = 01 (labeled HDMI_TWPST)

TX_TERM_CTL = Reg0Bh[4:3] = 11

SLEW_CTL = Reg0Bh[7:6] = 10

HDMI1.4b

Vsadj Resistor = 6.5 kΩ

VSWING_DATA & VSWING_CLK to -7% = Reg0Ch[7:2] = 111111

PRE_SEL = Reg0Ch[1:0] = 00: (Labeled HDMI_TWPST)

TX_TERM_CTL: Reg0Bh[4:3]

• <2 Gbps = 00 for no termination (This may be best value for all HDMI1.4b)
• >2 Gbps and < 3.4 Gbps = 01 for 150 to 300 Ω

SLEW_CTL = Reg0Bh[7:6] = 10