Cadence Design Systems, Inc.

Rambus Inc.

Sreeja Menon

Kartik Dayalal Kariya

Steven Cameron Woo

Amit Kedia

Nikhil Raghavendra Rao

Sudhir Kumar Katla Shetty

Charles J Wilson

Larry Arbuthnot

Srinivas Shanmukha Gundlapalli

Periodic signal timing calibration is implemented in time-distributed fragments executed concurrently with occasional system-idling maintenance operations to maintain reliable synchronous communication between interconnected system components without impacting system availability.

Fragmented periodic timing calibration

A control component transmits a timing strobe and associated write data burst to a memory component, extending the write data burst to include a quantity of successive bits in excess of active edges in the timing strobe to ensure that the write data burst is sampled under worst-case timing skew conditions.

Extended-burst write training

System connections map interface connections between the memory device and the memory controller. The memory controller is configured with information about these 'mapped' connections. The memory controller uses the mapping information to: correctly present commands and addresses to the memory device, perform CA training on mapped connections, generate read training data that accounts for mapped connections, correctly address mapped memory device pins for write training per pin adjustments, correctly calculate error detection coding, and correctly read vendor identification information.

Memory interface mapping

Multiple independent point-to-point memory channels are operated, by at least one controller, in parallel to form a wider memory channel. The memory components on these point-to-point channels include the ability to connect to multiple (e.g., 2) instances of these independent memory channels. The controller operates multiple instances of the wider channels with the memory components configured in a clamshell mode. A single memory component is also operated in clamshell mode to provide error correction code information, independently of the other wider channels, to multiple instances of the wider memory channel.

Growing community of inventors

Bengaluru, India

Sreeja Menon