L-USS820D-DB LSI, L-USS820D-DB Datasheet - Page 17

• Manufacturer Part Number: L-USS820D-DB
• Manufacturer: LSI

Specifications of L-USS820D-DB

• Operating Temperature (min): -20C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 85C
• Rad Hardened: No
• Lead Free Status / RoHS Status: Compliant

Data Sheet, Rev. 7
September 2004
Agere Systems Inc.
Register Interface
Table 14. Serial Bus Interrupt 1 Register (SBI1)—Address: 15H; 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).
FRXD7
Bit 7
Bit
7
6
5
4
3
2
1
0
Symbol
FRXD7
FRXD6
FRXD5
FRXD4
FTXD7
FTXD6
FTXD5
FTXD4
FTXD7
Bit 6
(continued)
Function Receive Done Flag, Endpoint 7.
Function Transmit Done Flag, Endpoint 7.
Function Receive Done Flag, Endpoint 6.
Function Transmit Done Flag, Endpoint 6.
Function Receive Done Flag, Endpoint 5.
Function Transmit Done Flag, Endpoint 5.
Function Receive Done Flag, Endpoint 4.
Function Transmit Done Flag, Endpoint 4.
FRXD6
Bit 5
FTXD6
Bit 4
R/W (S*)
Function/Description
FRXD5
Bit 3
FTXD5
Bit 2
USB Device Controller
FRXD4
Bit 1
USS-820D
FTXD4
Bit 0
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