grxstsr

         Receive Status Debug Read Register

Module Instance	Base Address	Register Address
`i_usbotg_0_globgrp`	`0xFFB00000`	`0xFFB0001C`
`i_usbotg_1_globgrp`	`0xFFB40000`	`0xFFB4001C`

Offset: 0x1C

Access: RO

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.

Bit Fields
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
`Reserved`							`fn` `RO 0x0`				`pktsts` `RO 0x0`				`dpid` `RO 0x0`
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
`dpid` `RO 0x0`	`bcnt` `RO 0x0`											`chnum` `RO 0x0`

grxstsr Fields

Bit

Name

Description

Access

Reset

24:21

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.

RO

0x0

20:17

pktsts


Mode: Host only
Packet Status (PktSts)
Indicates the status of the received packet
 4'b0010: IN data packet received
 4'b0011: IN transfer completed (triggers an interrupt)
 4'b0101: Data toggle error (triggers an interrupt)
 4'b0111: Channel halted (triggers an interrupt)
 Others: Reserved
 
 Mode: Device only
 Packet Status (PktSts)
Indicates the status of the received packet
 4'b0001: Global OUT NAK (triggers an interrupt)
 4'b0010: OUT data packet received
 4'b0011: OUT transfer completed (triggers an interrupt)
 4'b0100: SETUP transaction completed (triggers an
interrupt)
 4'b0110: SETUP data packet received
 Others: Reserved

Value	Description
0x2	INDPRX
0x3	INTRCOM
0x5	DTTOG
0x7	CHHALT

RO

0x0

16:15

dpid


Mode: Host only
Data PID (DPID)
Indicates the Data PID of the received packet
 2'b00: DATA0
 2'b10: DATA1
 2'b01: DATA2
 2'b11: MDATA
 
Mode: Device only
Data PID (DPID)
Indicates the Data PID of the received OUT data packet
 2'b00: DATA0
 2'b10: DATA1
 2'b01: DATA2
 2'b11: MDATA

Value	Description
0x0	DATA0
0x1	DATA2
0x2	DATA1
0x3	MDATA

RO

0x0

14:4

bcnt


Mode: Host only
Byte Count (BCnt)
Indicates the byte count of the received IN data packet.

Mode: Device only
Byte Count (BCnt)
Indicates the byte count of the received data packet.

RO

0x0

3:0

chnum


Mode: Host only
Channel Number (ChNum)
Indicates the channel number to which the current received
packet belongs.

Mode: Device only
Endpoint Number (EPNum)
Indicates the endpoint number to which the current received
packet belongs.

RO

0x0