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| author | Josh Blum <josh@joshknows.com> | 2010-10-15 11:22:25 -0700 |
|---|---|---|
| committer | Josh Blum <josh@joshknows.com> | 2010-10-15 11:22:25 -0700 |
| commit | 52229e99c90966c392f8ec74752912e3f00eec1d (patch) | |
| tree | c72cfdb388745c13c73859cd254bb2ae5d7fb804 /host/docs | |
| parent | 39ca8e25fc7f9b3170cb517b72640a62b15d253f (diff) | |
| parent | 26b7de0ac0cd64946582b2d52ab0bb3555156039 (diff) | |
| download | uhd-52229e99c90966c392f8ec74752912e3f00eec1d.tar.gz uhd-52229e99c90966c392f8ec74752912e3f00eec1d.tar.bz2 uhd-52229e99c90966c392f8ec74752912e3f00eec1d.zip | |
Merge branch 'flow_ctrl_with_fpga'
Diffstat (limited to 'host/docs')
| -rw-r--r-- | host/docs/transport.rst | 11 | ||||
| -rw-r--r-- | host/docs/usrp2.rst | 15 |
2 files changed, 18 insertions, 8 deletions
diff --git a/host/docs/transport.rst b/host/docs/transport.rst index 432db4bb5..2f730f8e4 100644 --- a/host/docs/transport.rst +++ b/host/docs/transport.rst @@ -40,6 +40,17 @@ The following parameters can be used to alter the transport's default behavior: as the asynchronous send implementation is currently disabled. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Flow control parameters +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The host-based flow control expects periodic update packets from the device. +These update packets inform the host of the last packet consumed by the device, +which allows the host to determine throttling conditions for the transmission of packets. +The following mechanisms affect the transmission of periodic update packets: + +* **ups_per_fifo:** The number of update packets for each FIFO's worth of bytes sent into the device +* **ups_per_sec:** The number of update packets per second + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Resize socket buffers ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It may be useful increase the size of the socket buffers to diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst index 1ebab388a..8fa666a49 100644 --- a/host/docs/usrp2.rst +++ b/host/docs/usrp2.rst @@ -39,12 +39,10 @@ Use the card burner tool (windows) ------------------------------------------------------------------------ Setup networking ------------------------------------------------------------------------ -The USRP2 only supports gigabit ethernet, and -will not work with a 10/100 Mbps interface. -Because the USRP2 uses gigabit ethernet pause frames for flow control, -you cannot use multiple USRP2s with a switch or a hub. -It is recommended that each USRP2 be plugged directly into its own -dedicated gigabit ethernet interface on the host computer. +The USRP2 only supports gigabit ethernet, +and will not work with a 10/100 Mbps interface. +However, a 10/100 Mbps interface can be connected indirectly +to a USRP2 through a gigabit ethernet switch. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Setup the host interface @@ -63,8 +61,9 @@ It is recommended that you change or disable your firewall settings. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Multiple device configuration ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -As described above, you will need one ethernet interface per USRP2. -Each ethernet interface should have its own subnet, +For maximum throughput, one ethernet interface per USRP2 is recommended, +although multiple devices may be connected via a gigabit ethernet switch. +In any case, each ethernet interface should have its own subnet, and the corresponding USRP2 device should be assigned an address in that subnet. Example: |