AFE7950EVM: jesd configuration mismatch is happening

Hi David,

I have configured both the AFE and FPGA with a lane rate of 9.8304 Gbps. On the FPGA side, the LMFSH is set to 24810, and on the AFE side, the LMFSH is also configured to 24810 with one instance. I followed the Latte configuration script as mentioned, but I am encountering errors in the Latte log. Additionally, the FPGA side sync signal from the DAC side is not coming through, and our Rx core is not generating any sync signal either.

Furthermore, I noticed that the SYSREF signal we are receiving from the AFE has a frequency of 3.84 MHz with a 50% duty cycle. However, from my research, the SYSREF signal should resemble a pulsed signal, not one with a 50% duty cycle. Could you kindly confirm whether the SYSREF signal we are receiving is correct?

Can you please help me with above issue?

#In HSDC Pro DAC tab, Select AFE79xx_2x2TX_44210; Data Rate = 245.76M
#In HSDC Pro ADC tab, Select AFE79xx_2x2RX_44210; Data Rate = 245.76M ---> To capture 4 RX channels

sysParams=AFE.systemParams
sysParams.__init__();sysParams.chipVersion=chipVersion

setupParams.skipFpga = 1 # setup FPGA (TSW14J56) using HSDC Pro 
##############		Top Level			##############
sysParams.FRef			= 491.52
sysParams.FadcRx		= 2949.12
sysParams.FadcFb		= 2949.12
sysParams.Fdac			= 2949.12*4
sysParams.externalClockRx=False
sysParams.externalClockTx=False
													
##############		Digital Chain		##############

		#####	RX	#####
sysParams.ddcFactorRx	=	[12,12,12,12]			#DDC decimation factor for RX A, B, C and D
sysParams.rxEnable		=   [True,True,False,False]
sysParams.rxNco0		= 	[[9500,9500],			#Band0, Band1 for RXA 
							[9500,9500],        	#Band0, Band1 for RXB 
							[9500,9500],        	#Band0, Band1 for RXC 
							[9500,9500]]        	#Band0, Band1 for RXD  

		#####	FB	#####
sysParams.fbEnable		=	[False,False]
sysParams.ddcFactorFb	=	[12,12]					#DDC decimation factor for FB 1 and 2
sysParams.fbNco0		= 	[9500,9500]				#Band0 for FB1 and FB2 

		#####	TX	#####
sysParams.ducFactorTx	=	[48,48,48,48]			#DUC interpolation factor for TX A, B, C and D
sysParams.txEnable		=   [True,True,False,False]
sysParams.txNco0		= 	[[9500,9500],			#Band0, Band1 for TXA 
							[9500,9500],        	#Band0, Band1 for TXB 
							[9500,9500],        	#Band0, Band1 for TXC 
							[9500,9500]]        	#Band0, Band1 for TXD


##############		JESD		##############

		#####	ADC-JESD	#####
sysParams.jesdSystemMode= [3,3]
													#SystemMode 0:	2R1F-FDD						; rx1-rx2-fb -fb
													#SystemMode 1:	1R1F-FDD						; rx -rx -fb -fb
													#SystemMode 2:	2R-FDD							; rx1-rx1-rx2-rx2
													#SystemMode 3:	1R								; rx -rx -rx -rx
													#SystemMode 4:	1F								; fb -fb- fb -fb
													#SystemMode 5:	1R1F-TDD						; rx/fb-rx/fb-rx/fb-rx/fb
													
sysParams.jesdTxProtocol= [0,0]						# 0 - 8b/10b encoding; 2 - 64b/66b encoding 
sysParams.LMFSHdRx		= ["24410","24410","24410","24410"]   #changed by Lakshmi ["44210","44210","44210","44210"] 
													# The 2nd and 4th are valid only for jesdSystemMode values in (0,2).
													# For other modes, select 4 converter modes for 1st and 3rd.
sysParams.LMFSHdFb		= ["14810","14810"]

sysParams.rxJesdTxScr	= [True,True,True,True] #changed by Lakshmi
sysParams.fbJesdTxScr	= [True,True]

sysParams.rxJesdTxK		= [16,16,16,16]
sysParams.fbJesdTxK		= [16,16]

sysParams.jesdTxLaneMux	= [0,1,2,3,4,5,6,7]			# Enter which lanes you want in each location. 
													# For example, if you want to exchange the first two lines of each 2T,
													#		this should be [[1,0,2,3],[5,4,6,7]]

		#####	DAC-JESD	#####
sysParams.jesdRxProtocol= [0,0]
sysParams.LMFSHdTx		= ["24410","24410","24410","24410"]  
sysParams.jesdRxLaneMux	= [0,1,2,3,4,5,6,7]			# Enter which lanes you want in each location.
sysParams.serdesRxLanePolarity = [1,1,0,0,1,1,0,0]													# For example, if you want to exchange the first two lines of each 2R
													#		this should be [[1,0,2,3],[5,4,6,7]]
sysParams.jesdRxRbd		= [4, 4]
sysParams.jesdRxScr		= [True,True,True,True]
sysParams.jesdRxK		= [16,16,16,16]

		#####	JESD Common	#####
	
sysParams.jesdABLvdsSync= True
sysParams.jesdCDLvdsSync= True
sysParams.syncLoopBack	= True	#JESD Sync signal is connected to FPGA

##############		GPIO		##############
sysParams.gpioMapping	= {
						'H8': 'ADC_SYNC0',
						'H7': 'DAC_SYNC0',  	#'ADC_SYNC1',
						'N8': 'ADC_SYNC2',
						'N7': 'ADC_SYNC3',
						'H9': 'ADC_SYNC1',		#'DAC_SYNC0',
						'G9': 'DAC_SYNC1',
						'N9': 'DAC_SYNC2',
						'P9': 'DAC_SYNC3',
						'P14': 'GLOBAL_PDN',
						'K14': 'FBABTDD',
						'R6': 'FBCDTDD',
						'H15': ['TXATDD','TXBTDD'],
						'V5': ['TXCTDD','TXDTDD'],
						'E7': ['RXATDD','RXBTDD'],
						'R15': ['RXCTDD','RXDTDD']}

##############		LMK Params		##############
lmkParams.pllEn			= True
lmkParams.inputClk		= 983.04 # Valid only when lmkParams.pllEn = False
lmkParams.lmkFrefClk	= True
setupParams.fpgaRefClk	= 245.76 # Should be equal to LaneRate/40 for TSW14J56

##############		Logging		##############
logDumpInst.setFileName(ASTERIX_DIR+DEVICES_DIR+r"\Afe79xxPg1.txt")
logDumpInst.logFormat=0x0 #Modify to 0x1 to save register scequence to log file. Script takes more time to execute.
logDumpInst.rewriteFile=1
logDumpInst.rewriteFileFormat4=1
device.optimizeWrites=0
device.rawWriteLogEn=1

device.delay_time = 0

AFE.deviceBringup()

AFE.TOP.overrideTdd(15,3,15)	# bit-wise; 4R,2F,4T

log results:

...

Hi David,

Regarding the SerDes lane connection, we are currently transmitting the data to SRX1 and SRX2 only.

As per your instructions, we have updated the two parameters to "false." However, the sync signal is still not being received, and we are encountering errors in the Latte log. Additionally, I had previously inquired about the SYSREF signal in my last query. Could you kindly confirm its status?

Hi David,

We have the DC135-AFE7950EVM board; however, we were unable to locate its schematic. As a result, we used the DC150A-AFE7950EVM schematic as a reference. Could you kindly confirm if this approach is acceptable? If not, could you please direct me to where I can find the required schematic? Is it possible to share the link for the schematic DC135A board.