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用软件可以仿效SDLC/HDLC控制器的所有功能,例如象传送率为1200波特及更高速率半双工操作的 Intel 8273,Western Digital 1933或 Zilog 8530。本软件可支持的功能有: 1)发送方式:利用在各帧起始标志和终止标志之间插入零的方法(在必要处),将八位并行字节输入转换成同步串行位输出。 2)接收方式:用删除零的方法(在必要处),将输入数据流的串行同步位转换成八位并行字节。这种方式还包括一个软件实现的数字锁相环路,以确保模拟器采样输入位在每个位定时帧的中心。
The software emulates all of the features of an SDLC / HDLC controller such as the Intel 8273, Western Digital 1933 or Zilog 8530 operating at half-duplex rates of 1200 baud and higher. The software supports the following functions: 1) Sending mode: Converts 8-bit parallel byte input to synchronous serial bit output using a method of inserting a zero between each frame start flag and a stop flag (where necessary). 2) Receive mode: Converts the serial sync bits of the incoming data stream to eight-bit parallel bytes using the method of deleting zeros where necessary. This approach also includes a software-implemented digital phase-locked loop to ensure that the simulator samples the input bits at the center of each bit timing frame.