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Diffstat (limited to 'host/docs/usrp2.rst')
| -rw-r--r-- | host/docs/usrp2.rst | 57 |
1 files changed, 52 insertions, 5 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst index 04622b9ce..3031a0075 100644 --- a/host/docs/usrp2.rst +++ b/host/docs/usrp2.rst @@ -209,19 +209,66 @@ Example device address string representation for 2 USRP2s with IPv4 addresses 19 addr0=192.168.10.2, addr1=192.168.20.2 +------------------------------------------------------------------------ +Using the MIMO Cable +------------------------------------------------------------------------ +The MIMO cable allows two USRP devices to share reference clocks, +time synchronization, and the ethernet interface. + ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -MIMO cable configuration +Shared ethernet mode ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -Using the MIMO cable, two USRP devices can be grouped together in a multi-device configuration. -Only one device in the configuration can be attached to the ethernet. +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. -* Both master and slave must have different IPv4 addresses but in the same subnet. +* 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. +* 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) +:: + + -- 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 + ------------------------------------------------------------------------ Hardware setup notes ------------------------------------------------------------------------ @@ -233,7 +280,7 @@ The LEDs on the front panel can be useful in debugging hardware and software iss The LEDs reveal the following about the state of the device: * **LED A:** transmitting -* **LED B:** serdes link +* **LED B:** mimo cable link * **LED C:** receiving * **LED D:** firmware loaded * **LED E:** reference lock |