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Diffstat (limited to 'host/docs/usrp2.rst')
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1 files changed, 17 insertions, 35 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst index 1b243656f..025cdd198 100644 --- a/host/docs/usrp2.rst +++ b/host/docs/usrp2.rst @@ -246,60 +246,42 @@ Using the MIMO Cable ------------------------------------------------------------------------ The MIMO cable allows two USRP devices to share reference clocks, time synchronization, and the ethernet interface. +One of the devices will sink its clock and time references to the MIMO cable. +This device will be referred to as the slave, and the other device, the master. + +* The slave device acquires the clock and time references from the master device. +* The master and slave may be used individually or in a multi-device configuration. +* External clocking is optional, and should only be supplied to the master device. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Shared ethernet mode ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ In shared ethernet mode, only one device in the configuration can be attached to the ethernet. -This device will be referred to as the master, and the other device, the slave. -* The master provides reference clock and time synchronization to the slave. -* All data passing between the host and the slave is routed over the MIMO cable. +* Clock reference, time reference, and data are communicated over the MIMO cable. * Both master and slave must have different IPv4 addresses in the same subnet. -* The master and slave may be used individually or in a multi-device configuration. -* External clocking is optional, and should only be supplied to the master device. -* The role of slave and master may be switched with the "mimo_mode" device address (see dual ethernet mode). - -Example device address string representation for 2 USRP2s with IPv4 addresses 192.168.10.2 (master) and 192.168.10.3 (slave) -:: - - -- Multi-device example -- - - addr0=192.168.10.2, addr1=192.168.10.3 - - -- Two single devices example -- - - addr=192.168.10.2 - - addr=192.168.10.3 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dual ethernet mode ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ In dual ethernet mode, both devices in the configuration must be attached to the ethernet. -One of the devices in the configuration will be configured to provide synchronization. -This device will be referred to as the master, and the other device, the slave. -* The master provides reference clock and time synchronization to the slave. -* The devices require the special device address argument "mimo_mode" set. +* Only clock reference and time reference are communicated over the MIMO cable. * Both master and slave must have different IPv4 addresses in different subnets. -* The master and slave may be used individually or in a multi-device configuration. -* External clocking is optional, and should only be supplied to the master device. -Example device address string representation for 2 USRP2s with IPv4 addresses 192.168.10.2 (master) and 192.168.20.2 (slave) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Configuring the slave +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +In order for the slave to synchronize to the master over MIMO cable, +the following clock configuration must be set on the slave device: :: - -- Multi-device example -- - - addr0=192.168.10.2, mimo_mode0=master, addr1=192.168.20.2, mimo_mode1=slave - - -- Two single devices example -- - - addr=192.168.10.2, mimo_mode=master - - addr=192.168.20.2, mimo_mode=slave + uhd::clock_config_t clock_config; + clock_config.ref_source = uhd::clock_config_t::REF_MIMO; + clock_config.pps_source = uhd::clock_config_t::PPS_MIMO; + usrp->set_clock_config(clock_config, slave_index); ------------------------------------------------------------------------ Hardware setup notes |