The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2018
Filed:
Oct. 29, 2014
Xilinx, Inc., San Jose, CA (US);
Sagheer Ahmad, Cupertino, CA (US);
Nishit Patel, San Jose, CA (US);
James J. Murray, Los Gatos, CA (US);
XILINX, INC., San Jose, CA (US);
Abstract
Circuits and methods are disclosed that allow devices to control the flow of DMA transfers to or from the devices using a token based protocol. In one example implementation, a DMA circuit includes a transfer control circuit that performs data transfers over a first data channel of a device, when transactions on the first data channel are enabled. The DMA circuit includes a flow control circuit that increments a token count for a data channel of a device when a token for the data channel is received and decrements the token count for each data transfer on the data channel performed by the DMA circuit. The flow control circuit enables data transfers on the data channel when the token count is greater than 0, and otherwise, disables data transfers on the data channel.