pll locked
时间: 2023-11-06 12:54:39 浏览: 60
回答: "PLL locked"是指锁相环(PLL)已经成功锁定了参考时钟信号。在锁定过程中,锁定信号(locked)可能会发生跳转,为了避免这种错误的指示,可以使用一个带有计数功能的gated lock信号。\[1\]\[2\]\[3\]
#### 引用[.reference_title]
- *1* *2* *3* [PLL中的locked信号解析](https://blog.csdn.net/qq_45467083/article/details/120432923)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]
相关问题
verilog pll
Verilog is a hardware description language (HDL) used for modeling and designing digital systems. A Phase-Locked Loop (PLL) is a common component used in digital circuit design, particularly in clock generation and frequency synthesis.
In Verilog, you can describe a PLL using behavioral, dataflow, or structural modeling styles. Here's a simple example of a behavioral model for a PLL:
```verilog
module PLL (
input wire clk_in,
input wire reset,
output wire pll_out
);
reg phase_locked;
reg [7:0] counter;
always @(posedge clk_in or posedge reset) begin
if (reset)
counter <= 8'b00000000;
else if (counter == 8'b11111111)
counter <= 8'b00000000;
else
counter <= counter + 1;
phase_locked <= (counter == 8'b11000000);
pll_out <= phase_locked ? ~pll_out : pll_out;
end
endmodule
```
This example demonstrates a basic PLL that generates an output clock (`pll_out`) by dividing the input clock (`clk_in`). The `counter` variable is used to divide the frequency, and once it reaches a specific value (`8'b11000000` in this case), the PLL locks to the input clock.
Please note that this is just a simple example, and real-world PLL designs may involve more complex logic and additional components.
pll verilog
PLL (Phase-Locked Loop) 是一种常见的电路设计技术,用于生成稳定的时钟信号。Verilog 是一种硬件描述语言 (HDL),用于描述和设计数字电路。
在 Verilog 中,可以使用模块化的方式来实现 PLL。你可以定义一个 PLL 模块,具体实现如下:
```verilog
module PLL (
input wire clk_in,
input wire reset,
output wire clk_out
);
reg [15:0] counter;
reg locked;
always @(posedge clk_in or posedge reset) begin
if (reset)
counter <= 0;
else if (counter == 10000)
counter <= 0;
else
counter <= counter + 1;
end
always @(posedge clk_in or posedge reset) begin
if (reset)
locked <= 0;
else if (counter == 5000)
locked <= 1;
else
locked <= 0;
end
always @(posedge clk_in or posedge reset) begin
if (reset)
clk_out <= 0;
else if (locked)
clk_out <= ~clk_out;
end
endmodule
```
上述 Verilog 代码定义了一个简单的 PLL 模块,其中输入包括 `clk_in` 和 `reset`,输出为 `clk_out`。该 PLL 模块通过计数器 `counter` 和锁定信号 `locked` 来生成稳定的时钟信号。
请注意,这只是一个简单的示例,实际的 PLL 设计可能涉及更多的参数和逻辑。你可以根据实际需求对代码进行修改和扩展。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)