Samsung S5PC110 Manual page 924

S5PC110_UM
5.8.3.13 Non-Periodic Transmit FIFO/Queue Status Register (GNPTXSTS, R, Address = 0xEC00_002C)
This read-only register contains the free space information for the Non-Periodic TxFIFO and the Non-Periodic
Transmit Request Queue.
GNPTXSTS Bit
Reserved [31]
NPTxQTop [30:24] Top of the Non-Periodic Transmit Request Queue.
NPTxQSpcAvail [23:16] Non-Periodic Transmit Request Queue Space Available.
NPTxFSpcAvail [15:0]
-
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)
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
•
Non-Periodic TxFIFO Space Available
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 ≤ 32768)
•
16'h8000: 32768 words available
•
Others: Reserved
•
Description
5 USB2.0 HS OTG
R/W Initial State
- 1'b0
R 7'h0
R 8'h08
R 16'h1F00
5-48