VHDL常量初始化

发布于 2024-09-09 03:06:52 字数 155 浏览 3 评论 0原文

我正在研究一些 VHDL 代码，对于常量的初始化，它表示如下：

constant address: integer := 16#8E#;

我以前从未见过这种定义。有谁知道这怎么翻译到一个普通的十进制数？

谢谢！

原文

I am just studying some VHDL code and for the initialisation of a constant it says the following:

constant address: integer := 16#8E#;

I have never seen this kind of definition before. Does anybody know how this translates
to an ordinary number in decimal?

Thanks!

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一抹苦笑 2024-09-16 03:06:53

16#8E# 表示以 16 为基数的 8E（即十六进制）。对于二进制，您可以为相同的数字编写 2#10001110#。一旦你知道了这一点，获得十进制版本应该很容易。

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毁虫ゝ 2024-09-16 03:06:52

要进一步扩展（如果您有 VHDL LRM，您可以阅读第 13.4.2 节中的详细信息），您可以在第一个 # 之前放置任何底数（2 到 16 之间），并在后面放置一个指数第二个#。您还可以将 _ 放入单独的数字组中。

指数始终以 10 为底数表示，并且不能为负数。
示例（VHDL 突出显示还有一些不足之处！）

entity test_numbers is
end entity test_numbers;
architecture a1 of test_numbers is
begin 
    process is
    begin  -- process
    report integer'image(16#FF#);  -- 255
    report integer'image(10#1_000#);  -- 1000
    report integer'image(10#1#e3);  -- 1000 another way
    report integer'image(2#1#e10);  -- 1024
    report integer'image(4#100#);  -- 16
    wait;
    end process;
end architecture a1;

报告：

# Loading work.test_numbers(a1)
# ** Note: 255
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 1000
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 1000
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 1024
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 16
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers

To expand further (if you have the VHDL LRM, you can read the gory details in section 13.4.2) you can put any base (between 2 and 16 inclusive) before the first # and an exponent after the second #. You can also put _s in to separate sets of numbers.

The exponent is always expressed in base 10 and cannot be negative.
Example (the VHDL highlighting leaves a little to be desired!)

entity test_numbers is
end entity test_numbers;
architecture a1 of test_numbers is
begin 
    process is
    begin  -- process
    report integer'image(16#FF#);  -- 255
    report integer'image(10#1_000#);  -- 1000
    report integer'image(10#1#e3);  -- 1000 another way
    report integer'image(2#1#e10);  -- 1024
    report integer'image(4#100#);  -- 16
    wait;
    end process;
end architecture a1;

reports:

# Loading work.test_numbers(a1)
# ** Note: 255
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 1000
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 1000
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 1024
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers
# ** Note: 16
#    Time: 0 ns  Iteration: 0  Instance: /test_numbers

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