John S Bartholomew

US Patent:

20110246686, Oct 6, 2011

Filed:

Apr 1, 2010

Appl. No.:

12/752303

Inventors:

Frederick George Fellenser - Paoli PA, US
John William Bartholomew - Phoenixville PA, US
Jia Tong - Chesterbrook PA, US

International Classification:

G06F 13/28

US Classification:

710 22

Abstract:

An apparatus and system having both PCI Root Port (RP) device and Direct Memory Access (DMA) End Point device functionality is disclosed. The apparatus is for use in an input/output (I/O) system interconnect module (IOSIM) device. A DMA/RP module includes a RP portion and one or more DMA/RP portions. The RP portion has one or more queue pipes and is configured to function as a standard PCIe Root Port device. Each of the DMA/RP portions includes DMA engines and DMA input and output channels, and is configured to behave more like an End Point device. The DMA/RP module also includes one or more PCIe hard core portions, an ICAM (I/O Caching Agent Module), and at least one PCIe service block (PSB). *The hard core portion couples the DMA/RP module and IOSIM device to an I/O device via a PCIe link, and the ICAM transitions data to a host memory device operating system.