我想用chipcope探测一个三态信号。
根据this answer record,它无法完成,所以这就是我的开始(仅包含相关代码):
-- Tristate signals
FPGA_SMB0_SDA <= sysmon_iic_data;
FPGA_SMB0_SCL <= sysmon_iic_clk;
-- Output signals
DEBUG_LED0 <= '0';
DEBUG_LED1 <= '0';
哪个构建正常,没有错误。
这是我第一次尝试生成调试信号,用于探测只是一个输出:
-- Tristate signals
FPGA_SMB0_SDA <= sysmon_iic_data;
FPGA_SMB0_SCL <= sysmon_iic_clk;
-- Generating new output signals using tristate (tristate signals are either '0' or 'X' for IIC)
sysmon_iic_data_debug <= '0' when (sysmon_iic_data = '0') else '1';
sysmon_iic_clk_debug <= '0' when (sysmon_iic_clk = '0') else '1';
-- connecting debug outs to debug leds (so that the debug signals aren't optimized out)
DEBUG_LED0 <= sysmon_iic_data_debug;
DEBUG_LED1 <= sysmon_iic_clk_debug;
上面的代码通过了综合,但NGDbuild给出了以下错误:
ERROR:ConstraintSystem:59 - Constraint <IOSTANDARD = LVCMOS25 ;>
[frm121401u1r1.ucf(333)]: NET "FPGA_SMB0_SDA"
not found. Please verify that:
1. The specified design element actually exists in the original design.
2. The specified object is spelled correctly in the constraint source file.
以上重复8次,每次净重两次。
我尝试的第二件事是使用一个过程:
FPGA_SMB0_SDA <= sysmon_iic_data;
FPGA_SMB0_SCL <= sysmon_iic_clk;
gen_sysmon_debug : process(refclk_10m,refclk_10m_rst)
begin
if (refclk_10m_rst = '1') then
sysmon_iic_data_debug <= '0';
sysmon_iic_clk_debug <= '0';
elsif (rising_edge(refclk_10m)) then
if (sysmon_iic_clk = '0') then
sysmon_iic_clk_debug <= '0';
else
sysmon_iic_clk_debug <= '1';
end if;
if (sysmon_iic_data = '0') then
sysmon_iic_data_debug <= '0';
else
sysmon_iic_data_debug <= '1';
end if;
end if;
end process;
DEBUG_LED0 <= sysmon_iic_data_debug;
DEBUG_LED1 <= sysmon_iic_clk_debug;
这给了我这个NGDbuild错误:
ERROR:NgdBuild:924 - bidirect pad net 'FPGA_SMB0_SDA' is driving non-buffer primitives:
pin D on block sysmon_iic_data with type FDC,
其中两个,一个用于SDA,一个用于SCL
这就是我的UCF:
NET "DEBUG_LED0" LOC = "AK33" | IOSTANDARD = LVCMOS25 ;
NET "DEBUG_LED1" LOC = "AK34" | IOSTANDARD = LVCMOS25 ;
...
NET "FPGA_SMB0_SCL" LOC = "G13" | IOSTANDARD = LVCMOS25 ;
NET "FPGA_SMB0_SDA" LOC = "H13" | IOSTANDARD = LVCMOS25 ;
顶级vhdl网络定义:
DEBUG_LED0 : out std_logic;
DEBUG_LED1 : out std_logic;
FPGA_SMB0_SCL : inout std_logic;
FPGA_SMB0_SDA : inout std_logic;
和uBlaze .mhs:
PORT xps_iic_1_Sda_pin = xps_iic_1_Sda, DIR = IO, BUFFER_TYPE = NONE
PORT xps_iic_1_Scl_pin = xps_iic_1_Scl, DIR = IO, BUFFER_TYPE = NONE
我完全不知道为什么我会收到这些NGDbuild错误,有人有任何想法吗?
答案 0 :(得分:0)
您的网络可能已经重命名,现在您已将其他信号连接到它:(
取出约束,让它构建。
将NCD文件加载到FPGA编辑器中,看看网络最终被调用了什么,并在你的UCF中使用它。
或者在顶级VHDL文件中自己实例化所有IOB,然后你知道IOB&#34; pin&#34;之间的网络的nae。并且真正的引脚不会改变,你可以约束那个网。