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參數(shù)資料
| 型號： | USS-820D |
| 英文描述： | USS-820D USB Device Controller |
| 中文描述： | 號- 820D USB設(shè)備控制器 |
| 文件頁數(shù)： | 17/58頁 |
| 文件大小： | 868K |
| 代理商： | USS-820D |
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Agere Systems Inc.
17
Data Sheet, Rev. 4
June 2001
USB Device Controller
USS-820D
Register Interface
(continued)
Table 13. Serial Bus Interrupt Register (SBI)—Address: 14H; Default: 0000 0000B
This register contains the USB function’s transmit and receive done interrupt flags for nonisochronous endpoints.
These bits are never set for isochronous endpoints.
* S = shared bit. See Special Firmware Action for Shared Register Bits section.
For all bits in the interrupt flag register, a 1 indicates that an interrupt is actively pending; a 0 indicates that the
interrupt is not active. The interrupt status is shown regardless of the state of the corresponding interrupt enable bit
in the SBIE/SBIE1.
Hardware can only set bits to 1. In normal operation, firmware should only clear bits to 0. Firmware can also set the
bits to 1 for test purposes. This allows the interrupt to be generated in firmware.
A set receive bit indicates either that valid data is waiting to be serviced in the RX FIFO for the indicated endpoint
and that the data was received without error and has been acknowledged, or that data was received with a receive
data error requiring firmware intervention to be cleared.
A set transmit bit indicates either that data has been transmitted from the TX FIFO for the indicated endpoint and
has been acknowledged by the host, or that data was transmitted with an error requiring firmware intervention to
be cleared.
If TXNAKE = 1, this also may indicate that a NAK was sent to the host in response to an IN packet that was
received when TXFIF = 00. This condition also sets TXVOID. This SBI/SBI1 setting will persist until firmware clears
TXVOID (or clears TXNAKE).
Bit 7
FRXD3
Bit 6
FTXD3
Bit 5
FRXD2
Bit 4
FTXD2
Bit 3
FRXD1
Bit 2
FTXD1
Bit 1
FRXD0
Bit 0
FTXD0
R/W (S*)
Bit
7
6
5
4
3
2
1
0
Symbol
FRXD3
FTXD3
FRXD2
FTXD2
FRXD1
FTXD1
FRXD0
FTXD0
Function/Description
Function Receive Done Flag, Endpoint 3.
Function Transmit Done Flag, Endpoint 3.
Function Receive Done Flag, Endpoint 2.
Function Transmit Done Flag, Endpoint 2.
Function Receive Done Flag, Endpoint 1.
Function Transmit Done Flag, Endpoint 1.
Function Receive Done Flag, Endpoint 0.
Function Transmit Done Flag, Endpoint 0.
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