GNPTXSTS

         Non-periodic Transmit FIFO/Queue Status Register

Module Instance	Base Address	Register Address
`i_usbotg_0_DWC_otg_intreg`	`0xFFB00000`	`0xFFB0002C`
`i_usbotg_1_DWC_otg_intreg`	`0xFFB40000`	`0xFFB4002C`

Size: 32

Offset: 0x2C

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` `RO 0x0`	`NPTxQTop` `RO 0x0`							`NPTxQSpcAvail` `RO 0x8`
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
`NPTxFSpcAvail` `RO 0x2000`

GNPTXSTS Fields

Bit

Name

Description

Access

Reset

RESERVED

RESERVED

RO

0x0

30:24

NPTxQTop

Top of the Non-periodic Transmit Request Queue (NPTxQTop)
Entry in the Non-periodic Tx Request Queue that is currently
being processed by the MAC.
 Bits [30:27]: Channel/endpoint number
 Bits [26:25]:
- 2'b00: IN/OUT token
- 2'b01: Zero-length transmit packet (device IN/host OUT)
- 2'b10: PING/CSPLIT token
- 2'b11: Channel halt command
 Bit [24]: Terminate (last Entry For selected channel/endpoint)

Value	Description
0x0	IN/OUT token
0x1	Zero-length transmit packet (device IN/host OUT)
0x2	PING/CSPLIT token
0x3	Channel halt command

RO

0x0

23:16

NPTxQSpcAvail

Non-periodic Transmit Request Queue Space Available
(NPTxQSpcAvail)
Indicates the amount of free space available in the Non-periodic
Transmit Request Queue. This queue holds both IN and OUT
requests in Host mode. Device mode has only IN requests.
 8'h0: Non-periodic Transmit Request Queue is full
 8'h1: 1 location available
 8'h2: 2 locations available
 n: n locations available (0 <= n <= 8)
 Others: Reserved

Value	Description
0x0	Non-periodic Transmit Request Queue is full
0x1	1 location available
0x2	2 locations available
0x3	3 locations available
0x4	4 locations available
0x5	5 locations available
0x6	6 locations available
0x7	7 locations available
0x8	8 locations available

RO

0x8

15:0

NPTxFSpcAvail

Non-periodic TxFIFO Space Avail (NPTxFSpcAvail)
Indicates the amount of free space available in the Non-periodic
TxFIFO.
Values are in terms of 32-bit words.
 16'h0: Non-periodic TxFIFO is full
 16'h1: 1 word available
 16'h2: 2 words available
 16'hn: n words available (where 0 <= n <= 32,768)
 16'h8000: 32,768 words available
 Others: Reserved

RO

0x2000