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| author | Wade Fife <wade.fife@ettus.com> | 2022-02-26 22:47:02 -0600 |
|---|---|---|
| committer | Wade Fife <wade.fife@ettus.com> | 2022-03-09 07:57:21 -0600 |
| commit | 08d03f881e2767f45ab7fc18c8003c9739b0ffb2 (patch) | |
| tree | 2515f62b786ddbde4ebfc727483f82499eead35a /fpga | |
| parent | 220710b18c1cc57a5c8d9244c8b84277a229363c (diff) | |
| download | uhd-08d03f881e2767f45ab7fc18c8003c9739b0ffb2.tar.gz uhd-08d03f881e2767f45ab7fc18c8003c9739b0ffb2.tar.bz2 uhd-08d03f881e2767f45ab7fc18c8003c9739b0ffb2.zip | |
fgpa: rfnoc: Set Replay memory transactions to 2 KiB
This sets the Replay block's counter width so that memory bursts are
up to 2 KiB. Previously, the counter width was fixed, which meant
that wide memories would require especially large buffers and could
exceed the 4 KiB limit imposed by AXI.
Diffstat (limited to 'fpga')
| -rw-r--r-- | fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/axis_replay.v | 6 | ||||
| -rw-r--r-- | fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/rfnoc_block_replay.v | 16 |
2 files changed, 15 insertions, 7 deletions
diff --git a/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/axis_replay.v b/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/axis_replay.v index 04a3adf3d..c83de1fc1 100644 --- a/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/axis_replay.v +++ b/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/axis_replay.v @@ -177,9 +177,9 @@ module axis_replay #( // Log base 2 of the depth of the input and output FIFOs to use. The FIFOs // should be large enough to store more than a complete burst // (MEM_BURST_LEN). A size of 9 (512 64-bit words) is one 36-kbit BRAM. - localparam REC_FIFO_ADDR_WIDTH = 9; // Log2 of input/record FIFO size - localparam PLAY_FIFO_ADDR_WIDTH = 9; // Log2 of output/playback FIFO size - localparam HDR_FIFO_ADDR_WIDTH = 5; // Log2 of output/time FIFO size + localparam REC_FIFO_ADDR_WIDTH = MEM_COUNT_W+1; // Log2 of input/record FIFO size + localparam PLAY_FIFO_ADDR_WIDTH = MEM_COUNT_W+1; // Log2 of output/playback FIFO size + localparam HDR_FIFO_ADDR_WIDTH = 5; // Log2 of output/time FIFO size // // Amount of data to buffer before writing to RAM. It must not exceed // 2**MEM_COUNT_W (the maximum count allowed by an AXI master). diff --git a/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/rfnoc_block_replay.v b/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/rfnoc_block_replay.v index b853db169..119b371c0 100644 --- a/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/rfnoc_block_replay.v +++ b/fpga/usrp3/lib/rfnoc/blocks/rfnoc_block_replay/rfnoc_block_replay.v @@ -322,8 +322,12 @@ module rfnoc_block_replay #( // Replay Block Instances //--------------------------------------------------------------------------- - // Width of memory transfer count. Always 8 for AXI4. - localparam MEM_COUNT_W = 8; + // Width of memory transfer count. This controls the maximum burst length + // supported by the Replay block. For AXI compatibility, it must be 8 or less + // and should not represent more than 4 KiB. Here we set it to 2 KiB by + // default. + localparam MEM_COUNT_W = (MEM_DATA_W <= 64) ? 8 : // Max width allowed + $clog2(2048 / (MEM_DATA_W/8)); // 2 KiB genvar i; generate @@ -417,6 +421,10 @@ module rfnoc_block_replay #( // //----------------------------------------------------------------------- + // Resize the count signals, in case they are not 8 bit. + wire [7:0] write_count_8 = write_count; + wire [7:0] read_count_8 = read_count; + axi_dma_master #( .AWIDTH (MEM_ADDR_W), .DWIDTH (MEM_DATA_W) @@ -485,7 +493,7 @@ module rfnoc_block_replay #( // Interface for Write transactions // .write_addr (write_addr), - .write_count (write_count), + .write_count (write_count_8), .write_ctrl_valid (write_ctrl_valid), .write_ctrl_ready (write_ctrl_ready), .write_data (write_data), @@ -496,7 +504,7 @@ module rfnoc_block_replay #( // Interface for Read transactions // .read_addr (read_addr), - .read_count (read_count), + .read_count (read_count_8), .read_ctrl_valid (read_ctrl_valid), .read_ctrl_ready (read_ctrl_ready), .read_data (read_data), |