Invention Grant
- Patent Title: Semiconductor memory asynchronous pipeline
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Application No.: US12371255Application Date: 2009-02-13
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Publication No.: US07865685B2Publication Date: 2011-01-04
- Inventor: Ian Mes
- Applicant: Ian Mes
- Applicant Address: CA
- Assignee: Mosaid Technologies Incorporated
- Current Assignee: Mosaid Technologies Incorporated
- Current Assignee Address: CA
- Agency: Hamilton, Brook, Smith & Reynolds, P.C.
- Priority: CA2233789 19980401
- Main IPC: G06F12/00
- IPC: G06F12/00

Abstract:
An asynchronously pipelined SDRAM has separate pipeline stages that are controlled by asynchronous signals. Rather than using a clock signal to synchronize data at each stage, an asynchronous signal is used to latch data at every stage. The asynchronous control signals are generated within the chip and are optimized to the different latency stages. Longer latency stages require larger delays elements, while shorter latency states require shorter delay elements. The data is synchronized to the clock at the end of the read data path before being read out of the chip. Because the data has been latched at each pipeline stage, it suffers from less skew than would be seen in a conventional wave pipeline architecture. Furthermore, since the stages are independent of the system clock, the read data path can be run at any CAS latency as long as the re-synchronizing output is built to support it.
Public/Granted literature
- US20090175103A1 SEMICONDUCTOR MEMORY ASYNCHRONOUS PIPELINE Public/Granted day:2009-07-09
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