Skip to content
Snippets Groups Projects
Commit 01be6e92 authored by Eric Kooistra's avatar Eric Kooistra
Browse files

Determine maximum c_cable_delay.

parent 70c040a8
No related branches found
No related tags found
1 merge request!389Resolve L2SDP-1013
Hide whitespace changes
Inline Side-by-side
applications/lofar2/libraries/sdp/tb/vhdl/tb_sdp_beamformer_remote_ring_bf.vhd
+ 72
− 19
View file @ 01be6e92
......@@ -20,7 +20,8 @@
--
-- Author: E. Kooistra
-- Purpose:
-- . Test bench for multiple sdp_beamformer_output.vhd + ring_lane.vhd in a ring
-- . Test bench for multiple sdp_beamformer_remote.vhd + ring_lane.vhd +
-- tr_10GbE in a ring
-- Description:
-- . https://support.astron.nl/confluence/display/L2M/L5+SDPFW+Design+Document%3A+Beamformer
--
......@@ -61,7 +62,8 @@
-- dp_bsn_align_v2 aligned output ||
-- FPGA_bf_aligned_latency_R(RN) v|
--
-- . Latency results from SDP-ARTS HW with 16 ring nodes (GN = 64 is RN = 0)
-- . BF latency results from SDP-ARTS HW
-- - with 16 ring nodes (GN = 64 is RN = 0)
-- - 2024-03-02T21.16.33_d601da896_lofar2_unb2b_sdp_station_full_wg
--
-- Node: bf_ring_rx bf_rx_align bf_aligned bf_ring_tx
......@@ -86,13 +88,43 @@
-- Simulation latency results with this tb
-- Node: bf_ring_rx bf_rx_align bf_aligned bf_ring_tx
-- _latency: _latency: _latency: _latency:
-- 0: -1 ( 1 0 ) 2053 2075
-- 1: 3862 ( 1 3875 ) 4101 4123
-- 2: 5914 ( 1 5927 ) 6149 6171
-- 3: 7965 ( 1 7978 ) 8197 -1
-- 0: -1 ( 1 0 ) 2053 2075
-- 1: 3862 ( 1 3875 ) 4101 4123
-- 2: 5914 ( 1 5927 ) 6149 6171
-- 3: 7965 ( 1 7978 ) 8197 -1
--
-- - The dp_bsn_align_v2 BSN latency monitor results agree between sim an HW.
-- - The bf_aligned_latency is exactly equal in sim and on HW, because the
-- mmp_dp_bsn_align_v2 uses the ref_sync for the BSN monitor and also to
-- release its BSN aligned output, so the latency only depends on internal
-- FW buffering and latency.
-- . The bf_aligned_latency and bf_ring_tx_latency do not depend on cable
-- delays and are constant when read again in sim or on HW, because they
-- only depend on fixed internal FW buffering and latency.
-- - The ring_lane BSN latency monitor results differ between sim and HW, it
-- is unclear why:
-- . the ring_rx and ring_tx BSN latency monitor results are about one
-- block of 1024 larger on HW.
-- . on the same HW node, the bf_ring_rx_latency is about one block of 1024
-- larger than the bf_rx_align_latency, even though they are taken at
-- nearly the same place in the ring_rx signal path.
-- . on the same HW node, the bf_ring_tx_latency is about one block of 1024
-- larger than the bf_align_latency, even though they are taken at nearly
-- the same place in the tx signal path.
-- . the ring_rx and ring_tx BSN latency monitor results for XST do not
-- show a one block is 1024 offset.
-- TODO:
-- . Assume the ring_lane latencies are one block is 1024 too high, and
-- assume that the bf_rx_align_latency is correct and reflects the actual
-- packet latency.
-- . The ring_rx and ring_tx both use func_ring_nof_hops_to_source_rn() and
-- hops = sosi.channel to get monitor_sosi, maybe there occurs an offset
-- there.
-- . The ring_rx and ring_tx both use dp_demux.vhd, maybe that causes a one
-- block is 1024 shift in sosi.sync.
--
-- Usage:
-- > as 8
-- > as 3 or more
-- > run -a
-------------------------------------------------------------------------------
......@@ -111,7 +143,8 @@ use work.tb_sdp_pkg.all;
entity tb_sdp_beamformer_remote_ring is
generic (
g_nof_rn : natural := 4 -- number of nodes in the ring
g_nof_rn : natural := 2; -- number of nodes in the ring
g_nof_sync : natural := 2
);
end tb_sdp_beamformer_remote_ring;
......@@ -121,9 +154,13 @@ architecture tb of tb_sdp_beamformer_remote_ring is
constant c_sa_clk_period : time := tech_pll_clk_644_period; -- 644MHz
-- Apply cable delay in tech_pll_clk_156_period units, to remain aligned with tr_10GbE sim model
-- Choose c_cable_delay = 30 * 6.4 ~= 192 ns ~= 38 dp_clk of 5 ns, to match delay seen on HW
-- . Choose c_cable_delay = 30 * 6.4 ~= 192 ns ~= 38 dp_clk of 5 ns, to match delay seen on HW
-- . Maximum c_cable_delay <= 186 * 6.4 = 1210 ns ~= 242 dp_clk of 5 ns in simulation with
-- g_nof_rn = 16. For larger c_cable_delay the bf_sum_sosi.data goes wrong. The maximum
-- c_cable_delay depends a little bit on g_nof_rn, for g_nof_rn = 2 the data goes wrong when
-- c_cable_delay >= 190.
constant c_clk_156_period : time := tech_pll_clk_156_period; -- 6.400020 ns ~= 156.25 MHz
constant c_cable_delay : time := c_clk_156_period * 30;
constant c_cable_delay : time := c_clk_156_period * 186;
-- BF data
constant c_block_period : natural := c_sdp_N_fft;
......@@ -131,7 +168,6 @@ architecture tb of tb_sdp_beamformer_remote_ring is
constant c_gap_size : natural := c_block_period - c_block_size;
-- choose sync interval somewhat longer than maximum BF ring latency
constant c_nof_blocks_per_sync : natural := largest(10, (g_nof_rn + 1) * 2);
constant c_nof_sync : natural := 2;
constant c_local_bf_re : integer := 1;
constant c_local_bf_im : integer := 2;
......@@ -155,7 +191,7 @@ architecture tb of tb_sdp_beamformer_remote_ring is
constant c_sync_timeout : natural := c_block_period * (c_nof_blocks_per_sync + 1);
-- Timeout tb if there is no output bf_sum_sosi
constant c_tb_timeout : time := (c_nof_sync + 1) * c_sync_timeout * c_dp_clk_period;
constant c_tb_timeout : time := (g_nof_sync + 1) * c_sync_timeout * c_dp_clk_period;
-- Address widths of a single MM instance
constant c_addr_w_reg_ring_lane_info_bf : natural := 1;
......@@ -248,7 +284,7 @@ begin
u_stimuli : entity dp_lib.dp_stream_stimuli
generic map (
g_sync_period => c_nof_blocks_per_sync,
g_nof_repeat => c_nof_blocks_per_sync * c_nof_sync,
g_nof_repeat => c_nof_blocks_per_sync * g_nof_sync,
g_pkt_len => c_block_size,
g_pkt_gap => c_gap_size
)
......@@ -268,6 +304,8 @@ begin
local_bf_sosi.data <= TO_DP_SDATA(0);
local_bf_sosi.re <= TO_DP_DSP_DATA(c_local_bf_re);
local_bf_sosi.im <= TO_DP_DSP_DATA(c_local_bf_im);
local_bf_sosi.channel <= TO_DP_CHANNEL(0);
local_bf_sosi.err <= TO_DP_ERROR(0);
end process;
bf_bs_sosi <= local_bf_sosi;
......@@ -275,6 +313,7 @@ begin
p_mm : process
variable v_span : natural;
variable v_span_node : natural;
variable v_offset : natural;
variable v_transport_nof_hops : natural;
begin
......@@ -283,6 +322,9 @@ begin
proc_common_wait_cross_clock_domain_latency(c_mm_clk_period, c_dp_clk_period,
c_common_cross_clock_domain_latency * 2);
---------------------------------------------------------------------------
-- Setup transport nof hops for RN = 0:15 to [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0]
---------------------------------------------------------------------------
-- Write FPGA_bf_ring_nof_transport_hops_RW = ring_lane_info.transport_nof_hops
v_span := 2**c_addr_w_reg_ring_lane_info_bf;
for RN in 0 to c_last_rn LOOP
......@@ -304,10 +346,15 @@ begin
FPGA_bf_ring_nof_transport_hops_R(RN) <= TO_UINT(reg_ring_lane_info_bf_cipo.rddata(c_word_w - 1 downto 0));
end loop;
---------------------------------------------------------------------------
-- Wait until second bf_sum_sosi.sync
---------------------------------------------------------------------------
proc_common_wait_until_hi_lo(dp_clk, bf_sum_sosi.sync);
proc_common_wait_until_hi_lo(dp_clk, bf_sum_sosi.sync);
---------------------------------------------------------------------------
-- Read BSN monitors
---------------------------------------------------------------------------
v_span := 2**c_sdp_reg_bsn_monitor_v2_addr_w;
-- Read FPGA_bf_ring_rx_latency_R
for RN in 0 to c_last_rn LOOP
......@@ -317,12 +364,13 @@ begin
FPGA_bf_ring_rx_latency_R(RN) <= TO_SINT(reg_bsn_monitor_v2_ring_rx_bf_cipo.rddata(c_word_w - 1 downto 0));
end loop;
-- Read FPGA_bf_rx_align_latency_R, for both c_sdp_P_sum = 2 inputs per RN
v_span_node := true_log_pow2(c_sdp_P_sum) * v_span;
for RN in 0 to c_last_rn LOOP
for I in 0 to c_sdp_P_sum - 1 loop
v_offset := 6 + RN * c_sdp_P_sum * v_span + I * v_span;
for P in 0 to c_sdp_P_sum - 1 loop
v_offset := 6 + RN * v_span_node + P * v_span;
proc_mem_mm_bus_rd(v_offset, mm_clk, reg_bsn_monitor_v2_bf_rx_align_cipo, reg_bsn_monitor_v2_bf_rx_align_copi);
proc_mem_mm_bus_rd_latency(1, mm_clk);
FPGA_bf_rx_align_latency_R(RN)(I) <= TO_SINT(reg_bsn_monitor_v2_bf_rx_align_cipo.rddata(c_word_w - 1 downto 0));
FPGA_bf_rx_align_latency_R(RN)(P) <= TO_SINT(reg_bsn_monitor_v2_bf_rx_align_cipo.rddata(c_word_w - 1 downto 0));
end loop;
end loop;
-- Read FPGA_bf_aligned_latency_R
......@@ -340,20 +388,24 @@ begin
FPGA_bf_ring_tx_latency_R(RN) <= TO_SINT(reg_bsn_monitor_v2_ring_tx_bf_cipo.rddata(c_word_w - 1 downto 0));
end loop;
---------------------------------------------------------------------------
-- Wait until end of simulation
---------------------------------------------------------------------------
mm_init <= '0';
-- Wait to stop simulation
proc_common_wait_until_high(dp_clk, stimuli_end);
proc_common_wait_some_cycles(dp_clk, 1000);
---------------------------------------------------------------------------
-- Print latency results
---------------------------------------------------------------------------
print_str("Node: bf_ring_rx bf_rx_align bf_aligned bf_ring_tx");
print_str(" _latency: _latency: _latency: _latency:");
for RN in 0 to c_last_rn loop
print_str(int_to_str(RN) & ": " &
int_to_str(FPGA_bf_ring_rx_latency_R(RN)) & " ( " &
int_to_str(FPGA_bf_rx_align_latency_R(RN)(0)) & " " &
int_to_str(FPGA_bf_rx_align_latency_R(RN)(1)) & " ) " &
int_to_str(FPGA_bf_rx_align_latency_R(RN)(0)) & " " &
int_to_str(FPGA_bf_rx_align_latency_R(RN)(1)) & " ) " &
int_to_str(FPGA_bf_aligned_latency_R(RN)) & " " &
int_to_str(FPGA_bf_ring_tx_latency_R(RN)));
end Loop;
......@@ -362,6 +414,7 @@ begin
wait;
end process;
-- End the tb simulation
proc_common_timeout_failure(c_tb_timeout, tb_end); -- ERROR: end simulation if it fails to end in time
proc_common_stop_simulation(tb_end); -- OK: end simulation
......
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment