Invention Grant
- Patent Title: Memory controller having a write-timing calibration mode
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Application No.: US13544967Application Date: 2012-07-09
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Publication No.: US08363493B2Publication Date: 2013-01-29
- Inventor: Frederick A. Ware
- Applicant: Frederick A. Ware
- Applicant Address: US CA Sunnyvale
- Assignee: Rambus Inc.
- Current Assignee: Rambus Inc.
- Current Assignee Address: US CA Sunnyvale
- Agent Charles Shemwell
- Main IPC: G11C7/10
- IPC: G11C7/10 ; G06F12/00

Abstract:
A memory controller outputs address bits and a first timing signal to a DRAM, each address bit being associated with an edge of the first timing signal and the first timing signal requiring a first propagation delay time to propagate to the DRAM. The memory controller further outputs write data bits and a second timing signal to the DRAM in association with the address bits, each of the write data bits being associated with an edge of the second timing signal and the second timing signal requiring a second propagation delay time to propagate to the DRAM. The memory controller includes a plurality of series-coupled delay elements to provide respective, differently-delayed internal delayed timing signals and a multiplexer to select one of the delayed timing signals to be output as the second timing signal based on a difference between the first propagation delay time and the second propagation delay time.
Public/Granted literature
- US20120275237A1 MEMORY CONTROLLER HAVING A WRITE-TIMING CALIBRATION MODE Public/Granted day:2012-11-01
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