FPGA/IC优质开源项目（七）综合

2年前更新

850

导言

本期主要带来VHDL的开源项目，也是第一次集中发VHDL的IP，包括：AXI-full（VHDL），AXI-lite（VHDL），Datamover（VHDL），MIPI_CSI2（VHDL），HDMI_Display(VHDL)，Motor_controller(VHDL)等。

开源项目

仓库地址：

https://github.com/KutuSystems/XilinxIP

MIPI_CSI2

经典开源项目了，并且经过完整的验证，如果大家有注意的话，国内有些开发板的CSI2例程用的就是这个IP，代码完全可见，质量有保证，很值得参考。

AXI_full

从代码注释看是赛灵思官方的代码，具体未知，比较久远的代码，但大厂代码还是值得参考的，注释非常好，比较有风格，下面是部分代码节选。

-- **************************************************************************
-- Read ID assignment
-- **************************************************************************

RID_REG : process(S_AXI_ACLK) is
begin
if (S_AXI_ACLK‘event and S_AXI_ACLK = ‘1’) then
if (S_AXI_ARESETN = ‘0’) then
RID_i <= (others => ‘0’);
else
RID_i <= axi_rid;
end if;
end if;
end process RID_REG;

— ****************************************************************************
— This process is used for generating the read response on AXI
— ****************************************************************************

RD_RESP_REG : process(S_AXI_ACLK) is
begin
if (S_AXI_ACLK‘event and S_AXI_ACLK = ‘1’) then
if (S_AXI_ARESETN = ‘0’) then
RRESP_1_i <= ‘0’;
else
if (send_rd_data = ‘1’) then
RRESP_1_i <= slv_err_resp or timeout_inprogress_s;
elsif (S_AXI_RREADY = ‘1’) then
RRESP_1_i <= ‘0’;
end if;
end if;
end if;
end process RD_RESP_REG;

AXI_HDMI_Display

代码来自 Digilent Inc，2014年份的IP，感兴趣可以仔细看看，下面是代码部分节选：

----------------------------------------------------------------------------------
-- Serialization PLL
-- This PLL generates the x2 and x10 pixel clock needed for TMDS serialization
----------------------------------------------------------------------------------

Inst_10_1_pll : PLL_BASE generic map(
BANDWIDTH   => “OPTIMIZED”,      — “high”, “low” or “optimized”
CLKFBOUT_MULT  => N,             — multiplication factor for all output clocks
COMPENSATION  => “INTERNAL”,         — “SYSTEM_SYNCHRONOUS”, “SOURCE_SYNCHRONOUS”, “INTERNAL”, “EXTERNAL”, “DCM2PLL”, “PLL2DCM”
DIVCLK_DIVIDE  => 1,             — division factor for all clocks (1 to 52)
CLKFBOUT_PHASE  => 0.0,          — phase shift (degrees) of all output clocks
CLK_FEEDBACK  => “CLKFBOUT”,
CLKIN_PERIOD  => CLKIN_PERIOD,   — clock period (ns) of input clock on clkin1
CLKOUT0_DIVIDE  => PLLO0,        — division factor for clkout0 (1 to 128)
CLKOUT2_DIVIDE  => PLLO2,       — division factor for clkout2 (1 to 128)
CLKOUT3_DIVIDE  => PLLO3,      — division factor for clkout3 (1 to 128)
REF_JITTER  => 0.025)           — input reference jitter (0.000 to 0.999 ui%)
port map (
CLKFBOUT   => intfb,           — general output feedback signal
CLKFBIN   => intfb_buf,          — clock feedback input
CLKOUT0   => pllout_xs,         — x10 clock for transmitter
CLKOUT1   => open,
CLKOUT2   => pllout_x1,           — x1 clock for BUFG
CLKOUT3   => pllout_x2,           — x2 clock for BUFG
CLKOUT4   => open,                — one of six general clock output signals
CLKOUT5   => open,                — one of six general clock output signals
LOCKED   => PllLckd,           — active high pll lock signal
CLKIN    => PCLK_I,        — primary clock input
RST    => PllRst);                — asynchronous pll reset