diff options
| -rw-r--r-- | mpm/python/usrp_mpm/dboard_manager/rh_init.py | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/mpm/python/usrp_mpm/dboard_manager/rh_init.py b/mpm/python/usrp_mpm/dboard_manager/rh_init.py index b4d4dded6..e75b9fa62 100644 --- a/mpm/python/usrp_mpm/dboard_manager/rh_init.py +++ b/mpm/python/usrp_mpm/dboard_manager/rh_init.py @@ -34,13 +34,16 @@ class RhodiumInitManager(object): # Variable PPS delay before the RP/SP pulsers begin. Fixed value for the N3xx devices. N3XX_INT_PPS_DELAY = 4 # JESD core default configuration. - # TODO: define the actual values for rx_sysref_delay and tx_sysref_delay. JESD_DEFAULT_ARGS = {"lmfc_divider" : 12, - "rx_sysref_delay": 8, + "rx_sysref_delay": 5, "tx_sysref_delay": 11, "tx_driver_swing": 0b1101, "tx_precursor" : 0b00100, "tx_postcursor" : 0b00100} + # After testing the roundtrip latency (i.e. FPGA -> TX -> RX -> FPGA), + # it was found that a different value of RX SYSREF delay is required + # for sampling_clock_rate = 400 MSPS to achieve latency consistency. + RX_SYSREF_DLY_DIC = {400e6: 6, 491.52e6: 5, 500e6: 5} def __init__(self, rh_class, spi_ifaces): @@ -251,7 +254,7 @@ class RhodiumInitManager(object): if not self.adc.check_framer_status(): self.log.error("ADC JESD204B Framer is not synced!") error_flag = True - if not jesdcore.get_deframer_status(True): # TODO: Remove the boolean argument! + if not jesdcore.get_deframer_status(): self.log.error("JESD204B FPGA Core Deframer is not synced!") error_flag = True if error_flag: @@ -280,6 +283,14 @@ class RhodiumInitManager(object): if 'tx_prbs' in args: perform_tx_prbs = (args['tx_prbs'] == 'True') or (args['tx_prbs'] == True) + # Latency across the JESD204B TX/RX links should remain constant and + # deterministic across the supported sampling_clock_rate values. + # After testing the roundtrip latency (i.e. FPGA -> TX -> RX -> FPGA), + # it was found that a different set of SYSREF delay values are required + # for sampling_clock_rate = 400 MSPS to achieve latency consistency. + self.JESD_DEFAULT_ARGS['rx_sysref_delay'] = \ + self.RX_SYSREF_DLY_DIC[self.rh_class.sampling_clock_rate] + # Bringup Sequence. # 1. Prerequisites (include opening mmaps) # 2. Initialize LMK and bringup clocks. |