| 摘要 |
A cache memory with improved cache-miss performance is implemented by providing cache-miss data from system memory directly to its requester. One embodiment of the invention operates as a texture cache in a graphics system. The graphics system comprises a system memory that stores texture data, coupled to a texture cache memory, which is coupled to at least one requester. The texture cache memory is divided into a cache tags unit and a data cache unit. The data cache unit is configured to receive at least two cache address inputs, and has at least two data output ports each coupled to a respective first input of a respective multiplexer. A respective second input of each multiplexer is configured to receive cache-miss data from the system memory. The select input of each multiplexer is configured to receive a respective hit/miss indicator signal associated with the respective cache address input. In case of a cache-miss, cache-miss data from system memory bypasses the data cache unit and is output directly. The cache-miss data is then written into the data cache unit during a subsequent clock cycle.
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