From c02dd5e8f974dddf9f7ccbdf8290d9b928ae3989 Mon Sep 17 00:00:00 2001 From: Piotr Binkowski Date: Tue, 28 Jan 2020 14:28:24 +0100 Subject: [PATCH] tools/litex_sim: add ddr4 PhySettings --- litex/tools/litex_sim.py | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/litex/tools/litex_sim.py b/litex/tools/litex_sim.py index ad1588d5..097f8ed9 100755 --- a/litex/tools/litex_sim.py +++ b/litex/tools/litex_sim.py @@ -72,6 +72,7 @@ sdram_module_nphases = { "LPDDR": 2, "DDR2": 2, "DDR3": 4, + "DDR4": 4, } def get_sdram_phy_settings(memtype, data_width, clk_freq): @@ -109,6 +110,18 @@ def get_sdram_phy_settings(memtype, data_width, clk_freq): wrcmdphase, wrphase = get_sys_phases(nphases, cwl_sys_latency, cwl) read_latency = 2 + cl_sys_latency + 2 + 3 write_latency = cwl_sys_latency + elif memtype == "DDR4": + # Settings from usddrphy + tck = 2/(2*nphases*clk_freq) + cmd_latency = 0 + cl, cwl = get_cl_cw(memtype, tck) + cl_sys_latency = get_sys_latency(nphases, cl) + cwl = cwl + cmd_latency + cwl_sys_latency = get_sys_latency(nphases, cwl) + rdcmdphase, rdphase = get_sys_phases(nphases, cl_sys_latency, cl) + wrcmdphase, wrphase = get_sys_phases(nphases, cwl_sys_latency, cwl) + read_latency = 2 + cl_sys_latency + 1 + 3 + write_latency = cwl_sys_latency sdram_phy_settings = { "nphases": nphases, -- 2.30.2