uusbdef.v

USBRTL电路的VHDL和Verilog代码

/******************************************
	Filename: 	usbdef.v 1.2
******************************************/

// PID types and bits
parameter [3:0]
	PIDOUT		= 4'b0001,
	PIDIN		= 4'b1001,
	PIDSOF		= 4'b0101,
	PIDSETUP 	= 4'b1101,
	PIDDATA0	= 4'b0011,
	PIDDATA1	= 4'b1011,
	PIDACK		= 4'b0010,
	PIDNAK		= 4'b1010,
	PIDSTALL	= 4'b1110,
	PIDPRE		= 4'b1100;