I want to perform a compliance test in the 100BASE-TX mode. According to the datasheet,
I can access the register 0x0027 and read it. But the PHY does not generate a special waveform.
I do not know whether this register is the right register to let PHY into the compliance test.
Who has the similar experience for this test?
Hi Evan,
Thanks for your quick reply. I set the register as your suggestion. In my test, I test the PHY with TDSET3 software from tektronix.
It has a template waveform with random waveform.
But in the DP83822 datasheet, there is no similar waveform setting as following.
100Base-TX Test Mode is determined by bits {[5] in register 0x0428,
[3:0] in register 0x0027}. The bits determine the number of 0's to
follow a '1'.
0,0001 = Single '0' after a '1'
0,0010 = Two '0' after a '1'
0,0011 = Three '0' after a '1'
0,0100 = Four '0' after a '1'
0,0101 = Five '0' after a '1'
0,0110 = Six '0' after a '1'
0,0111 = Seven '0' after a '1'
...
1,1111 = Thirty one '0' after a '1'
0,0000 = Clears the shift register
Note 1: To reconfigure the 100Base-TX Test Mode, bit[4] must be
cleared in register 0x0428 and then reset to '1' to configure the new
pattern.
Note 2: When performing 100Base-TX or 10Base-Te tests modes,
the speed must be forced using the Basic Mode Control Register
(BMCR), address 0x0000.
Do you know how to set the related register to generate the special waveform? Thanks.
Hi Evan,
Normally we will perform a 100BASE-TX normal compliance test. The test item is as the following:
The usually 100BASE-TX test item is :Template, Differential Output Voltage, Amplitude Symmetry, Rise Time, Fall Time, Rise/Fall Time Symmetry, Waveform Overshoot, Jitter, Duty Cycle
In the TDSET3 manual, I see there is a table for each test items vs test pattern.
It shows maybe PHY vendor should have a special program for these test items?
Hi Jimmy,
For this test, please use the following script from snla266:
This script disables auto-negotiation, causing the DP83822 to output scrambled idles.
Thank you,
Evan
