发明名称 |
Digitally controlled impedance for I/O of an integrated device |
摘要 |
<p>A system for controlling the impedances of circuits on an integrated chip is provided. At least one circuit is selected to operate as a p-channel reference circuit, and at least one circuit is selected to operate as an n-channel reference circuit. Other circuits are selected to operate as circuits and/or line termination circuits. A digitally controlled impedance (DCI) circuit controls the p-channel reference circuit to determine a desired configuration of p-channel transistors for use in the circuits. The DCI circuit further controls the n-channel reference circuit to determine a desired configuration of n-channel transistors for use in the circuits. The DCI circuit takes into account such factors as resistances of p-channel transistors in the p-channel reference circuit, resistances of n-channel transistors in the n-channel reference circuit, as well as temperature, voltage and process variations. The DCI circuit relays information identifying the desired configurations of the n-channel and p-channel transistors to the circuits. The circuits are then configured in response to this information. <IMAGE></p> |
申请公布号 |
EP1515442(A1) |
申请公布日期 |
2005.03.16 |
申请号 |
EP20040023919 |
申请日期 |
2001.02.16 |
申请人 |
XILINX, INC. |
发明人 |
SCHULTZ, DAVID P.;BERGENDAHL, JASON R.;MENON, SURESH M.;TAN, JIAN;HAO, EUNICE U. D. |
分类号 |
H03K19/00;H01L27/04;H01L21/82;H01L21/822;H03K19/003;H03K19/0175;H04L25/02;(IPC1-7):H03K19/00 |
主分类号 |
H03K19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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