gnptxsts
Non-periodic Transmit FIFO/Queue Status Register
| Module Instance | Base Address | Register Address |
|---|---|---|
| i_usbotg_0_globgrp | 0xFFB00000 | 0xFFB0002C |
| i_usbotg_1_globgrp | 0xFFB40000 | 0xFFB4002C |
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 |
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 | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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)
|
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
|
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 |