哪位能指点一下关于EZUSB FX2的GPIF的一些问题

Programming GPIF Waveforms
The “programs” for GPIF waveforms are the Waveform Descriptors, which are stored in the Waveform
Registers by FX2 firmware.
The FX2 can hold up to four Waveform Descriptors, each of which can be used for one of four
types of transfers: Single Write, Single Read, FIFO Write, or FIFO Read. By default, one Waveform
Descriptor is assigned to each transfer type, but it’s not necessary to retain that configuration;
all four Waveform Descriptors could, for instance, be configured for FIFO Write usage (see the
GPIFWFSELECT register in Chapter 15 \"Registers\").
Each Waveform Descriptor consists of up to seven 32-bit State Instructions that program key transition
points for GPIF interface signals. There’s a one-to-one correspondence between the State
Instructions and the GPIF state-machine States. Among other things, each State Instruction
defines the state of the CTLx outputs, the state of FD[15:0], the use of the RDYn inputs, and the
behavior of GPIFADR[8:0].
Transitions from one State to another always happen on a rising edge of the IFCLK, but the GPIF
may remain in one State for many IFCLK cycles.

看了好久，总是不能理解。这个waveform到底有什么用？做什么的？

这个波形用来设定数据传输的方式。由此使得读写逻辑线上的信号也不同