Christian Staudt

US Patent:

6757763, Jun 29, 2004

Filed:

Apr 7, 2000

Appl. No.:

09/545393

Inventors:

Frank Preiss - Santa Cruz CA
Christian Staudt - Santa Clara CA
Joerg Hartung - Los Gatos CA

Assignee:

Infineon Technologies North America Corpration - San Jose CA

International Classification:

G06F 1342

US Classification:

710105, 710106, 710305, 710306

Abstract:

An improved Universal Serial Bus interface employing FIFO buffers ( ) for interfacing to an application bus and a microprocessor bus, in particular, an XBUS. The interface includes a plurality of transmit/receive channels ( ) multiplexed to the application bus and the XBUS. Each transmit channel includes a transmit FIFO buffer ( ), a transmit write buffer ( ), a transmit push buffer ( ), and three transmit state machines: a transmit write state machine ( ), a transmit interrupt state machine ( ), and a transmit push state machine ( ). The transmit state machine ( ) and the transmit FIFO ( ) are clocked in the USB domain. The transmit write register ( ) is clocked in the XBUS domain. Each receive channel includes a receive FIFO buffer ( ), a receive state machine ( ), and a receive register ( ). The receive FIFO ( ), the receive state machine ( ), and the receive register ( ) are all clocked in the USB domain.

US Patent:

6745342, Jun 1, 2004

Filed:

Dec 29, 1999

Appl. No.:

09/474423

Inventors:

Christian Staudt - Santa Clara CA
Joerg Hartung - Los Gatos CA

Assignee:

Infineon Technologies North America Corp. - San Jose CA

International Classification:

G06F 1100

US Classification:

714 25

Abstract:

A Universal Serial Bus interface including a USB device controller coupled by way of a shortcut protection circuit to a USB transceiver. The shortcut protection circuit compares the driven DPLS and DMNS signals from the USB transceiver with TxDPLS and TxDMNS, the transmitted signals from the USB device controller. If a difference is detected between TxDPLS and DPLS, or between TxDMNS and DMNS, the transmission is disabled.