DAC37J84EVM: Register Configuration issue

Vignesh ravi

Prodigy 90 points

Part Number: DAC37J84EVM
Other Parts Discussed in Thread: DAC37J84

PFA register config screenshot. The explanation seems to be improper.

For example

1) 15:13th bit of 0x3E register if i set the following combination 000 or 001 or 011 or 111 what will happen?

2) 10:8 bit of 0x3E register if i set the following combination 000or 001 or 011 or 011 or 111 what will happen?

3) 15th bit of 0x3B register if i set 1 else 0 what will happen?

4) 14:11 bit of 0x3B register if i set the following combination 0000 or 0001 or 0011 or 0111 or 1111 what will happen?

5) 12:11 bit of 0x3C register if i set the following combinations 00 or 01 or 10 or 11 what will happen?

6) 8:1bit of 0x3C register if i set the following combinations 00000000 or 00000001 or 00000011 or 00000111 or 00001111 or 00011111 or 00111111 or 011111111 or 11111111 what will happen in the register?

7) 0x3B,0x3C and 0x3E registers cloud you give me proper register configurations for LMFS =2441.

Kindly guide me through this.

over 4 years ago

0 Kang Hsia over 4 years ago

TI__Guru 66014 points

Hello,

regarding your questions:

Vignesh ravi said:
1) 15:13th bit of 0x3E register if i set the following combination 000 or 001 or 011 or 111 what will happen?

the following is the truth table for LOS

3b'000 = loss of signal detection disabled

3b'100 = enabled loss of signal detection

all other combinations are reserved

When enabled the loss of signal, the differential signal amplitude of rxpi and rxni is monitored. Depending on wehther it is below or above the pre-set electrical voltage threshold, the LOSDTCT bit alarms will be asserted.

Vignesh ravi said:
2) 10:8 bit of 0x3E register if i set the following combination 000or 001 or 011 or 011 or 111 what will happen?

see below for datasheet capture

Vignesh ravi said:
3) 15th bit of 0x3B register if i set 1 else 0 what will happen?

Vignesh ravi said:
4) 14:11 bit of 0x3B register if i set the following combination 0000 or 0001 or 0011 or 0111 or 1111 what will happen?

You may use the GUI to check the clock reference for the SERDES related clocking

double click on the lower left hand corner to check the register values

Vignesh ravi said:

4) 14:11 bit of 0x3B register if i set the following combination 0000 or 0001 or 0011 or 0111 or 1111 what will happen?

5) 12:11 bit of 0x3C register if i set the following combinations 00 or 01 or 10 or 11 what will happen?

6) 8:1bit of 0x3C register if i set the following combinations 00000000 or 00000001 or 00000011 or 00000111 or 00001111 or 00011111 or 00111111 or 011111111 or 11111111 what will happen in the register?

see following SERDES clock section for guidance