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author | Martin Braun <martin.braun@ettus.com> | 2014-10-07 11:25:20 +0200 |
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committer | Martin Braun <martin.braun@ettus.com> | 2014-10-07 11:25:20 +0200 |
commit | fd3e84941de463fa1a7ebab0a69515b4bf2614cd (patch) | |
tree | 3fa721a13d41d2c0451d663a59a220a38fd5e614 /fpga/usrp3/vita_chdr.txt | |
parent | 3b66804e41891e358c790b453a7a59ec7462dba4 (diff) | |
download | uhd-fd3e84941de463fa1a7ebab0a69515b4bf2614cd.tar.gz uhd-fd3e84941de463fa1a7ebab0a69515b4bf2614cd.tar.bz2 uhd-fd3e84941de463fa1a7ebab0a69515b4bf2614cd.zip |
Removed copy of FPGA source files.
Diffstat (limited to 'fpga/usrp3/vita_chdr.txt')
-rw-r--r-- | fpga/usrp3/vita_chdr.txt | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/fpga/usrp3/vita_chdr.txt b/fpga/usrp3/vita_chdr.txt deleted file mode 100644 index a194a88c6..000000000 --- a/fpga/usrp3/vita_chdr.txt +++ /dev/null @@ -1,41 +0,0 @@ - - -VRLP and VITA Fields -==================== - -All VRT (VITA 49.0) packets will be carried in a VRL (VITA 49.1) frame when outside the FPGA core. -Every VRL frame will hold exactly one VRT packet. -VRT packets must have stream ID -VRT packets must NOT have integer seconds timestamps -VRT packets must NOT have class ID -VRT packets may have fractional seconds timestamps -VRT packets may have trailer -Only VITA IF Data and VITA Extension Context packets are allowed - -VITA Compressed Headers -======================= - -Structure of a normal VRL-encapsulated VRT packet, in 64-bit wide format: - -VRLP { VRLP_text[31:0], frame_count[11:0], frame_size[19:0] } -VRT0 { VRT_Header[31:0], Stream ID[31:0] } -VRT1 { Fractional timestamp[63:0] } OPTIONAL -... Packet contents ... -Optional Trailer -"VEND" - -Since packet contents can have variable length, 64-bit alignment of trailer and VEND will vary - -Inside the FPGA switching fabric, the first line of "compressed vita packets" will be called the "CHDR". -The "CHDR" compresses the contents of the VRLP header and VRT header and streamID, and has the following format: - -BIT Meaning -63 is_extension_context (0 for data, 1 for control packets) -62 reserved -61 has_time (0 for no, 1 for time field on next line) -60 EOB (end of burst indicator) -59:48 12-bit sequence number (from VRLP frame count, bottom 4 bits should match VRT seq number) -47:32 16-bit length in bytes (from VRT length in words32) -31:0 stream ID - -Inside the fabric, the "VEND" from VRLP is dropped. |