发明名称 |
DIGITALLY CONTROLLED IMPEDANCE FOR I/O OF AN INTEGRATED CIRCUIT DEVICE |
摘要 |
A system for controlling the impedances of circuits on an integrated circuit 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 circuit s 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 cirucit relays information identifyi ng the desired configurations of the n-channel and p-channel transistors to the circuits. The circuits are then configured in response to this information.< /SDOAB>
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申请公布号 |
CA2425056(A1) |
申请公布日期 |
2002.04.18 |
申请号 |
CA20012425056 |
申请日期 |
2001.02.16 |
申请人 |
XILINX, INC. |
发明人 |
BERGENDAHL, JASON R.;HAO, EUNICE Y.D.;MENON, SURESH M.;TAN, JIAN;SCHULTZ, DAVID P. |
分类号 |
H01L27/04;H01L21/82;H01L21/822;H03K19/00;H03K19/003;H03K19/0175;H04L25/02;(IPC1-7):H03K19/00 |
主分类号 |
H01L27/04 |
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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