GRXSTSP

Address offset: 0x020

Receive Status Read/Pop Register

A read to the Receive Status Read and Pop register returns the contents of the top of the Receive FIFO and additionally pops the top data entry out of the RxFIFO. The receive status contents must be interpreted differently in Host and Device modes. The core ignores the receive status pop/read when the receive FIFO is empty and returns a value of 32'h0000_0000. The application must only pop the Receive Status FIFO when the Receive FIFO Non-Empty bit of the Core Interrupt register (GINTSTS.RxFLvl) is asserted. Note: - Use of these fields vary based on whether the core is functioning as a host or a device. - Do not read this register's reset value before configuring the core because the read value is 'X' in the simulation.


Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID											E	E	E	E	D	D	D	D	C	C	B	B	B	B	B	B	B	B	B	B	B	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	R	CHNUM										Channel Number (ChNum) Mode: Host only Indicates the channel number to which the current received packet belongs. Endpoint Number (EPNum) Mode: Device only Indicates the endpoint number to which the current received packet belongs.
			CHEP0	0								Channel or EndPoint 0
			CHEP1	1								Channel or EndPoint 1
			CHEP2	2								Channel or EndPoint 2
			CHEP3	3								Channel or EndPoint 3
			CHEP4	4								Channel or EndPoint 4
			CHEP5	5								Channel or EndPoint 5
			CHEP6	6								Channel or EndPoint 6
			CHEP7	7								Channel or EndPoint 7
			CHEP8	8								Channel or EndPoint 8
			CHEP9	9								Channel or EndPoint 9
			CHEP10	10								Channel or EndPoint 10
			CHEP11	11								Channel or EndPoint 11
			CHEP12	12								Channel or EndPoint 12
			CHEP13	13								Channel or EndPoint 13
			CHEP14	14								Channel or EndPoint 14
			CHEP15	15								Channel or EndPoint 15
B	R	BCNT										Byte Count (BCnt) In host mode, indicates the byte count of the received IN data packet. In device mode, indicates the byte count of the received data packet.
C	R	DPID										Data PID (DPID) In host mode, indicates the Data PID of the received packet. In device mode, indicates the Data PID of the received OUT data packet.
			DATA0	0								DATA0
			DATA2	1								DATA2
			DATA1	2								DATA1
			MDATA	3								MDATA
D	R	PKTSTS										Packet Status (PktSts) indicates the status of the received packet. In host mode, In device mode,
			OUTNAK	1								Global OUT NAK in device mode (triggers an interrupt)
			INOUTDPRX	2								IN data packet received in host mode and OUT data packet received in device mode
			INOUTTRCOM	3								IN or OUT transfer completed in both host and device mode (triggers an interrupt)
			DSETUPCOM	4								SETUP transaction completed in device mode (triggers an interrupt)
			DTTOG	5								Data toggle error (triggers an interrupt) in host mode
E	R	FN										Mode: Device only. Frame Number (FN) This is the least significant 4 bits of the (micro)Frame number in which the packet is received on the USB. This field is supported only when isochronous OUT endpoints are supported.