Samsung S5PC100 User Manual page 888

S5PC100 USER'S MANUAL (REV1.0)
8.2.23 Host Periodic Transmit FIFO/QUEUE Status Register (HPTXSTS, R, Address = 0xED20_0410)
This read-only register contains the free space information for the Periodic TxFIFO and the Periodic Transmit
Request Queue.
HPTXSTS Bit
PTxQTop [31:24] Top of the Periodic Transmit Request Queue
PTxQSpcAvai [23:16] Periodic Transmit Request Queue Space Available
l
PTxFSpcAvail [15:0]
This indicates the entry in the Periodic Tx Request Queue that is
currently being processes by the MAC.
This register is used for debugging.
• Bit [31] : Odd/Even (micro)frame
- 1'b0 : send in even (micro)frame
- 1'b1 : send in odd (micro)frame
• Bits [30:27] : Channel/endpoint number
• Bits [26:25] : Type
-2'b00 : IN/OUT
-2'b01 : Zero-length packet
-2'b10 : CSPLIT
-2'b11 : Disable channel command
• Bit[24] : Terminate
Indicates the number of free locations available to be written in
the Periodic Transmit Request Queue. This queue holds both IN
and OUT requests.
• 8'h0 : Periodic Transmit Request Queue is full
• 8'h1 : 1 location available
• 8'h2 : 2 location available
• n : n locations available (0 ≤ n ≤ 8)
• Others : Reserved
Periodic Transmit Data FIFO Space Available
Indicates the number of free locations available to be written to
in the Periodic TxFIFO.
Values are in terms of 32-bit words
• 16'h0: Periodic TxFIFO is full
• 16'h1: 1 word available
• 16'h2: 2 words available
• n: n words available (0 ≤ n ≤ 8)
• Others: Reserved
Description
USB2.0 HS OTG
R/W Reset Value
R 8'h0
R 8'h8
R 16'h0100
8.10-45