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Part Number: AFE7444EVM
I am working with AFE7444EVM..
I have one question is
1. if I want to bypass the decimation filters in ADC chain or Interpolation filters in DAC chain. What is the maximum data rate i can transfer from JESD204B to FPGA.
Like if ADC is 3GPS and each sample is 14 bit. Can we transfer all data to FPGA and if yes in which Mode of LMFS?
It is not possible to bypass the decimation filters in AFE7444. All possible modes of operation are shown in section "7.4 Device Functional Modes" in the datasheet.
If you need to use ADC in bypass mode, you can request access to AFE7422 secure folder at https://www.ti.com/licreg/docs/swlicexportcontrol.tsp?form_id=288371&prod_no=AFE7422&ref_url=asc_dc_hsc
In AFE7422, configuring ADC in bypass mode is possible. LMFS and other mode details are in AFE7422 datasheet.
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In reply to Vijayendra Varma Siddamsetty:
Thanks for your reply
I have done some calculation for Mode 3
I have Used formula
=983.04*4*3*10 = 117.9648 Gbps
Here in mode 3 it's coming 117.9648 Gbps which i think cant be mapped to 4 lanes as the limit is 15 Gbps per lane.
Can you tell me where I am wrong?
In reply to ganesh singh1:
Total lane rate = (Data rate)*Num_converters*Num_bit_per_sample*(10b/8b)
For mode 3, Data rate = (8847.36 MSPS)/9 = 983.04 MSPS
Number of bits per sample (bit resolution) = 12
So Total Data rate = (983.04 MSPS)* 4* 12* (10/8) = 58982.4 Mbps = 58.9824 Gbps
When mapped to 4 lanes, lane rate = (58.9824 Gbps) / 4 = 14.7456 Gbps
Thanks for it. But I want to know the significance of F, especially when it's more than 4. How the calculations for it.
I have used (https://e2e.ti.com/blogs_/b/analogwire/archive/2014/09/24/jesd204b-determining-your-link-configuration
193.75Msps*2*2*10=7.75Gbps Total throughput
I am not able to understand the F calculations particularly.
Hi Ganesh Singh,
In the formula,
Total lane rate = Datarate*Num_Converters*Num_Octets*10b/Octet
Num_Octets is number of octets per sample. This is equal to F in cases with S=1. Otherwise this is F/S. (Note that this doesn't work n cases where Hd = 1. In this case, you can use 'octets per sample' definition instead).
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