EnCoReV中的I/O模拟多路复用器

你好，
根据威廉希尔官方网站 参考手册，CY7C64 xx EnCOREV设备具有全设备的模拟I/O多路复用总线。有可能使用这个总线重新映射GPIO引脚吗？例如，我想重新映射P1Y6（timeRoT）到P1Y7，以简化我的PCB设计。我已经尝试在开发板上做这件事，并且注意到以下设计的有趣行为：
P1Y6被配置为从计时器输出（驱动模式‘强’，VDD＝5V）的32 kHz信号，连接到I/O多路复用器。公共汽车
P1Y7：驱动模式：高Z输入，连接到I/O MUX总线
P1Y6上的信号按预期输出，在P1Y7上，示波器可以看到相同的信号，但幅度为3V。
当我增加信号的频率时，振幅下降到2V。
看来我不正确地使用硬件，参考手册根本没有帮助，有一个神秘的短语：“你可以同时连接任何数量的引脚，专用支持电路允许选择引脚交替充电高或连接到总线”。所以有一些模拟电路会扭曲我的信号。谁能解释一下这个I/O多路复用器总线上到底发生了什么？
谢谢您。



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Hi,
According to the Technical Reference Manual, CY7C64xx EnCoReV devices have a device-wide  Analog I/O Multiplexer bus. Is it possible to use this bus to remap GPIO pins? For example, I would like to remap P1_6 (TIMEROUT) to P1_7 to simplify my PCB design. I have tried to do this on the development board and have noticed an interesting behavior for the following design:
P1_6 is configured to output 32kHz signal from Timer (drive mode 'Strong', VDD = 5V),  connected to the I/O Mux. bus
P1_7: drive mode: High-Z input, connected to the I/O Mux bus
The signal on P1_6 is output as expected, on P1_7 I can see with oscilloscope the same signal but with amplitude of 3V.
When I increase the frequency of the signal, the amplitude drops down to 2V.
It seems I am using the hardware improperly, the Reference Manual is not helpful at all, there is a mysterious phrase: 'You are able to connect any number of pins simultaneously, and dedicated support circuitry allows selected pins to be alternately charged high or connected to the bus '. So there is some analog circuitry that distorts my signal. Can please anyone clarify what is really going on on this I/O Multiplexer bus?
Thank you.