发明授权
- 专利标题: Double data rate chaining for synchronous DDR interfaces
- 专利标题(中): 双数据速率链接同步DDR接口
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申请号: US11426651申请日: 2006-06-27
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公开(公告)号: US07739538B2公开(公告)日: 2010-06-15
- 发明人: Michael Fee , Patrick J. Meaney , Christopher J. Berry , Jonathan Y. Chen , Alan P. Wagstaff
- 申请人: Michael Fee , Patrick J. Meaney , Christopher J. Berry , Jonathan Y. Chen , Alan P. Wagstaff
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 代理机构: Fleit Gibbons Gutman Bongini & Bianco P.L.
- 代理商 Jon A. Gibbons
- 主分类号: G06F5/06
- IPC分类号: G06F5/06 ; G11C8/16
摘要:
A system and method in which the receiving chip separately latches each half of the data received from the double data rate bus. Each half is launched as soon as it is available; one on the normal chip cycle time and the other is launched from a Master (L1) latch a half cycle into the normal chip cycle time. The first launched half of the data proceeds through the chip along its standard design chip path to be captured by the chips driving interface latch and launched again after one cycle of latency on the chip. The second half of the data proceeds through the chip one half cycle behind the first half, and is latched a half clock cycle later part way through the path into a Slave (L2) latch. On the next edge of the local clock, the data then continues from the L2 latch to the driving double data rate interface. This allows a half cycle set up time for the second half of the data so that it can be launched again, maintaining a one-cycle time on the chip.
公开/授权文献
- US20070300095A1 Double Data Rate Chaining for Synchronous DDR Interfaces 公开/授权日:2007-12-27
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