Patent Number: 6,311,294

Title: Device and method for efficient bulk data retrieval using a universal serial bus

Abstract: A USB device for communicating data from the device to a USB host is provided. The USB device may have an interrupt or isochronous endpoint for communicating interrupts to the host and a bulk data endpoint for communicating bulk data to the host. The USB device may communicate a signal over the interrupt or isochronous endpoint to the host indicating that the device has bulk data to communicate to the host and may communicate bulk data over the bulk endpoint in response to bulk data requests from the host generated based on the signal over the interrupt or isochronous endpoint. The device may count a predetermined period of time when the device is generating a NAK signal in response to the bulk data request signals from the host because the device does not have any bulk data, and may communicate a signal over the bulk endpoint to the host, once the predetermined period of time has elapsed, indicating that the host halts the bulk data requests until another signal over the interrupt or isochronous endpoint is received.

Inventors: Larky; Steven P. (Del Mar, CA), Swindle; Scott (San Diego, CA), Kolokowsly; Steve (San Diego, CA), McCoy; Mark (San Diego, CA)

Assignee: Cypress Semiconductor Corp.

International Classification: G06F 13/20 (20060101); G06F 13/24 (20060101); G06F 013/00 ()

Expiration Date: 10/30/2018