Silicon Graphics, Incorporated

Bitblitz Communications, Inc.

Yue-Hong Sutu

Bin Wu

Paul K French

A detector compares a first bit of a bit stream to a first bit of a pattern. If the first bit of the bit stream and the first bit of the pattern are the same, another detector is allowed to read a second bit of the bit stream and compare it to a second bit of the pattern. This continues until all bits of the pattern are detected. By performing the comparison as each bit of the bit stream arrives on a node, the present detectors are able to detect bit patterns in high-speed bit streams.

High-speed bit-pattern detector

A precise TLB error detection and shutdown circuit that detects for two or more matching tag entries in a TLB by providing an array of n units of error detection circuit unit &lt;i&gt;, wherein each error detection unit &lt;i&gt; comprises a first input B&lt;i&gt; coupled to an associated bit &lt;i&gt; of an input n-bit tag compare indicator. A second input A&lt;i&gt; is coupled to an output bit of an immediately preceding error detection unit &lt;i-1&gt;. A third input C&lt;i&gt; is coupled to a output bit of a immediately preceding error detection unit &lt;i-1&gt;. Each error detection unit &lt;i&gt; generates a first output bit X&lt;i&gt;, the output indicator X&lt;i&gt; indicating a result of detecting two or more matching tag entries, and a second output indicator Y&lt;i&gt;, the output indicator Y&lt;i&gt; indicating a result of detecting one or more matching tag entries. The TLB shutdown circuit generates an active TLB shutdown indicator in response to detecting an active state in the address translation cycle indicator and an active state in a termainal output indicator X&lt;n-1&gt; from the array error detection units.

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Pleasanton, CA, United States of America

Yue-Hong Sutu