[参考译文] AFE7900EVM：NCO 频率配置

admin

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1295365/afe7900evm-nco-frequency-configuration

器件型号：AFE7900EVM

您好！

对于我们的应用、我们需要快速更改 NCO 频率(以扫描频谱的方式)。对此、SPI 命令方法很慢。

在一个论坛帖子中、提到了如何使用某些 GPIO 引脚将 NCO 切换到预定频率。

我已经问过这个问题: https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1285010/afe7900evm-nco-frequency-configuration

但是我没有收到我的后续问题的答案。我们需要跨多个频段(而不仅仅是2个频段)进行切换。

请建议：

1 年多前

0 admin 1 年多前

TI__Guru**** 1821780 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

您好、SM：

以下脚本可用于配置 AFE、以便通过 GPIO 设置所选的 NCO。

##############		Read me			##############
#In HSDC Pro DAC tab, Select AFE79xx_2x2TX_44210; Data Rate = 491.52M
#In HSDC Pro ADC tab, Select AFE79xx_2x2RX_44210; Data Rate = 491.52M ---> 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	=	[6,6,6,6]				#DDC decimation factor for RX A, B, C and D
sysParams.rxNco0		= 	[[5400,5400],			#Band0, Band1 for RXA 
							[500,500],        		#Band0, Band1 for RXB 
							[2500,2500],        	#Band0, Band1 for RXC 
							[1800,1800]]        	#Band0, Band1 for RXD 

		#####	FB	#####
sysParams.fbEnable		=	[False,False]
sysParams.ddcFactorFb	=	[6,6]					#DDC decimation factor for FB 1 and 2
sysParams.fbNco0		= 	[500,1800]				#Band0 for FB1 and FB2 

		#####	TX	#####
sysParams.ducFactorTx	=	[18,18,18,18]			#DUC interpolation factor for TX A, B, C and D
sysParams.txNco0		= 	[[5400,5400],			#Band0, Band1 for TXA 
							[500,500],        		#Band0, Band1 for TXB 
							[2500,2500],        	#Band0, Band1 for TXC 
							[1800,1800]]        	#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		= ["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		= ["22210","22210"]

sysParams.rxJesdTxScr	= [True,True,True,True]
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		= ["44210","44210","44210","44210"]
sysParams.jesdRxLaneMux	= [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 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': 'ADC_SYNC1',
						'N8': 'ADC_SYNC2',
						'N7': 'ADC_SYNC3',
						'H9': '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'],
						'E6': 'TX_NCOSEL_0',
						'C5': 'TX_NCOSEL_1',
						'P16': 'TX_NCOSEL_2',
						'C6': 'TX_NCOSEL_3',
						'G6': 'RX_NCOSEL_0',
						'G7': 'RX_NCOSEL_1',
						'G8': 'RX_NCOSEL_2',
						'R5': 'RX_NCOSEL_3',
						'C6': 'TX_NCOSEL_3',}

##############		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
lmk.rawWriteLogEn=1

##############		16 NCO Params		##############
sysParams.ncoFreqMode	= "FCW"

sysParams.ncoRxMode		=	[6,6]
sysParams.broadcastRxNcoSel = 1
sysParams.numRxNCO		=	2

sysStatus.txChainDirectCtrl=True
sysParams.txChainDirectCtrl=True
sysParams.ncoTxMode		=	[3,3]
sysParams.broadcastTxNcoSel = 1
sysParams.numTxNCO		=	2


device.delay_time = 0
#-------------------------------------------------------------------------------------------------#
AFE.deviceBringup()

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

for i in range(16):
	for j in range(3):
		AFE.updateRxNcoInfiniteNcoMode(j,5400+50*i,i)
		AFE.updateTxNcoInfiniteNcoMode(j,5400+50*i,i)

for i in range(2):	
	for j in range(2):
		device.TT[j].TXDIG[i].TXDIG.REGGROUP_4.config_fmixer_update_pulse = 0
		device.TT[j].TXDIG[i].TXDIG.REGGROUP_4.config_fmixer_update_pulse = 1

# AFE.IOWRAP.overrideFunction('TX_NCOSEL_0',1,1)
# AFE.IOWRAP.overrideFunction('TX_NCOSEL_2',1,1)
# AFE.IOWRAP.overrideFunction('TX_NCOSEL_1',1,1)
# AFE.IOWRAP.overrideFunction('TX_NCOSEL_3',1,1)

# AFE.IOWRAP.overrideFunction('RX_NCOSEL_0',0,0)
# AFE.IOWRAP.overrideFunction('RX_NCOSEL_1',0,0)
# AFE.IOWRAP.overrideFunction('RX_NCOSEL_2',0,0)
# AFE.IOWRAP.overrideFunction('RX_NCOSEL_3',0,0)

要更新 NCO 频率、请使用以下函数。

使用命令 AFE.updateRxNcoInfiniteNcoMode (ch_num、NCO_freq、NCO_num)更新 RX NCO 频率 ch_num -> 0至3；NCO_freq 的单位为 MHz；NCO_num -> 0至15
使用命令 AFE.updateTxNcoInfiniteNcoMode (ch_num、NCO_freq、NCO_num)更新 TX NCO 频率 ch_num -> 0至3；NCO_freq 以 MHz 为单位；NCO_num -> 0至15

使用以下寄存器写入将 UPDATE_PULSE 位从0 -> 1进行编程、以立即更新 TX NCO 频率。当 NCO 被切换时、TX NCO 频率也被自动更新。

device.TT[0].TXDIG[0].TXDIG.REGGROUP_4.CONFIG_fmixer_update_pulse = 0

device.TT[0].TXDIG[0].TXDIG.REGGROUP_4.CONFIG_fmixer_update_pulse = 1

请‘、对于测试、可以使用"FAFE.IOWRAP.overrideFunction"命令从 Latte 覆盖 GPIO：

例如、要将 TX_NCOSEL_0设置为‘1"、请运行 AFE.IOWRAP.OVERRIDEFunction ('TX_NCOSEL_0'、1、1)# OVERRIDE_ENABLE = 1；OVERRIDE_VALUE = 1
要将 TX_NCOSEL_0设置为‘0'、请运行 AFE.IOWRAP.OVERRIDEFunction ('TX_NCOSEL_0'、1、0)# OVERRIDE_ENABLE = 1；OVERRIDE_VALUE = 1
要禁用覆盖、请运行 AFE.IOWRAP.OVERRIDEFunction ("TX_NCOSEL_0"、0、0)# OVERRIDE_ENABLE = 0

此致、

大卫·查帕罗

射频与微波（参考译文帖）

射频与微波（参考译文帖）(Read Only)

[参考译文] AFE7900EVM：NCO 频率配置