ADRV9025: Sync Header Alignment Issue in JESD204C

Question

Hi Team, 
 I am bringing-up jesd204c on adrv9025 where I am using eval board. 
 I am seeing that random sync header alignment issue where I am not seeing bit transition. Even though, jesd204_rx_sh_lock and jesd204_rx_emb_lock signals are asserted. 
 Also, sometime jesd204_rx_sh_lock and jesd204_rx_emb_lock are deasserted. 
 
 Could you please give me some pointers where we can look into ? 
 
 Regards, 
 MVS

Vinod_Mekala · Accepted Answer

MKS3134 said:
What else , I can see apart of jesd204_rx_sh_lock.

You can try PRBS test to check the link integrity. Use DfrmPrbsErrCountGet API function to retrieve the error status and lane errors. The error status is a 3-bit word, where Bit 0 = Lane inverted, bit 1 = invalid data flag, bit 2 = sample/lane error flag. If status bit 2 is set that means, we have signal integrity issues. Also make sure that bit 0 (lane inverted flag) is not set which would suggest that we have a lane polarity mismatch.

If the signal integrity issue is still an issue, it is recommended to change the highBoost parameter in the profile. A value of 0 is recommended for low insertion loss (<11dB) lanes whereas a value of 1 is recommended for high insertion loss lanes (>11dB). Have you tried these debug options?

Please refer to ‘FIRST TIME SYSTEM BRING UP—CHECKING LINK INTEGRITY’ in the ADRV9026 user guide.

A sample PRBS testing script is shown below:

##################################SAMPLE PYTHON PRBS SCRIPT########################################################

DfrmPrbsCfg=Types.adi_adrv9010_DfrmPrbsCfg_t()

DfrmPrbsCfg.deframerSel=Types.adi_adrv9010_DeframerSel_e.ADI_ADRV9010_DEFRAMER_0

DfrmPrbsCfg.polyOrder=Types.adi_adrv9010_DeframerPrbsOrder_e.ADI_ADRV9010_PRBS31

DfrmPrbsCfg.checkerLocation=Types.adi_adrv9010_DeframerPrbsCheckLoc_e.ADI_ADRV9010_PRBSCHECK_LANEDATA

adrv9010.DataInterface.DfrmPrbsCheckerStateSet(DfrmPrbsCfg)

DfrmPrbsErrCounters = Types.adi_adrv9025_DfrmPrbsErrCounters_t()

DfrmPrbsErrCounters.sampleSource = Types.adi_adrv9010_DeframerPrbsCheckLoc_e.ADI_ADRV9010_PRBSCHECK_LANEDATA

time.sleep(0.001)

#Setup FPGA and DUT PRBS Generator/Checker for PRBS7

print "Transmit PRBS 7 from FPGA"

prbs_sel = 5 # prbs 31 and 1 for PRBS 7#

arg = 1

while arg < len(sys.argv):

if sys.argv[arg] == "-pn":

if sys.srgv[arg+1] == "7":

prbs_sel = 1

elif sys.argv[arg+1] == "9":

prbs_sel = 2

elif sys.argv[arg+1] == "15":

prbs_sel = 3

elif sys.argv[arg+1] == "23":

prbs_sel = 4

elif sys.argv[arg+1] == "31":

prbs_sel = 5

else:

print "PRBS polynomial must be 7, 9, 15, 23, or 31"

exit(1)

arg = arg + 2

elif sys.argv[arg] == "-h" or sys.argv[arg] == "help":

print "Usage: -pn <polynomial>"

print " -pn <polynomial> : polynomial = 7 (default), 9, 15, 23, 31"

print " -h, help : this help message"

exit(0)

# Turn on PRBS

print "Starting PRBS"

for x in range(8):

writefpga((0x43400100 + x*0x100),0x00000004)

writefpga((0x43400148 + x*0x100),0x20800080)

writefpga((0x43400140 + x*0x100),0x0003007C)

writefpga((0x43400110 + x*0x100),0x02015233)

writefpga((0x43400120 + x*0x100),prbs_sel * 0x01000000)

writefpga((0x43400100 + x*0x100),0x00000000)

val = 0

#I do not know if this is needed

#while (val & 0x1) == 0:

#val = readfpga(0x43400104 + x*0x100)

#link.platform.board.Fpga.Prbs.PrbsSerializerEnable(0x0F,0x1)

print

adrv9010.DataInterface.DfrmPrbsCountReset()

print "Error Counters Cleared"

print "--------------PRBS Error Count Readout (after error cntr clear)"

adrv9010.DataInterface.DfrmPrbsErrCountGet(DfrmPrbsErrCounters)

print 'SERDIN_A PRBS Err Cnt: ',DfrmPrbsErrCounters.laneErrors[0]

print 'SERDIN_B PRBS Err Cnt: ',DfrmPrbsErrCounters.laneErrors[1]

print 'SERDIN_C PRBS Err Cnt: ',DfrmPrbsErrCounters.laneErrors[2]

print 'SERDIN_D PRBS Err Cnt: ',DfrmPrbsErrCounters.laneErrors[3]

print 'SERDIN_A PRBS Err Cnt: ',DfrmPrbsErrCounters.errorStatus[0]

print 'SERDIN_B PRBS Err Cnt: ',DfrmPrbsErrCounters.errorStatus[1]

print 'SERDIN_C PRBS Err Cnt: ',DfrmPrbsErrCounters.errorStatus[2]

print 'SERDIN_D PRBS Err Cnt: ',DfrmPrbsErrCounters.errorStatus[3]

time.sleep(1)

# Inject prbs error if desired:

injectError = 1

if injectError:

for x in range(8):

temp = readfpga(0x43400120 + x*0x100)

writefpga((0x43400120 + x*0x100), temp | 0x10000000)

print "--------------PRBS Error Count Readout (error injected)"

link.platform.board.Adrv9010Device.DataInterface.DfrmPrbsErrCountGet(DfrmPrbsErrCounters)