Cache with high access store bandwidth
View Patent ↗A cache memory system and method for supporting multiple simultaneous store operations using a plurality of tag memories is provided. The cache data system further provides a plurality of multiple simultaneous cache store functions along with a single cache load function that is simultaneous with the store functions. Embodiments create a cache memory wherein the cache write buffer does not operate as a bottle neck for data store operations into a cache memory system or device.
1. An electronic circuit with a cache system comprising:
a single-ported cache data memory;
a first slot tag SRAM(Static Random Access Memory) and a second slot tag SRAM;
a first slot address calculation logic circuit for calculating a first address for control of storing, in the single-ported cache data memory, first slot data for a first issue slot;
a first slot tag arbiter that receives the first address from said first slot address calculation logic circuit for controlling access to the first slot tag SRAM;
a second slot address calculation logic circuit for calculating a second store address for control of storing in, or loading from, the single-ported cache data memory, second slot data for a second issue slot;
a second slot tag arbiter that receives the second address from said second slot address calculation logic circuit for controlling access to the second slot tag SAM;
a cache write buffer configured for buffering the first slot data, and for buffering the second slot data in case of the storing of the second slot data in the single-ported cache data memory, and comprising:
a first buffer input for receiving the first slot data;
a second buffer input for receiving the second slot data;
a buffer output for supply of the buffered first slot data and the buffered second slot data to the single-ported cache data memory.
2. The electronic circuit of claim 1 , comprising an access arbiter for controlling access to the single-ported data cache memory, such that in case the second issue slot requests loading the second slot data from the single-ported cache data memory, the access arbiter is configured for granting, to the second issue slot, access to the single-ported data cache memory and for preventing the cache write buffer from accessing the single-ported data cache memory, and the cache write buffer is operative to buffer the first slot data.
3. The electronic circuit of claim 1 , wherein said single-ported cache data memory comprises a plurality of SRAM devices for carrying out data interleaving based on memory addresses.
4. The electronic circuit of claim 3 , wherein said cache write buffer's access to said cache data memory is performed during the same clock cycle with a load operation to said cache data memory.
5. The electronic circuit of claim 1 , wherein said cache system is a pseudo-multi-ported cache system.
6. The electronic circuit of claim 1 , further comprising at least a third slot tag SRAM; a third slot address calculation logic circuit for calculating a third address for control of storing, in the single-ported cache data memory, third slot data for a third issue slot; and a third slot arbiter that receives the third slot address from the third slot address calculating logic circuit for controlling access to the third slot tag SRAM; such that the cache write buffer has a third buffer input for receiving the third slot data, and the cache write buffer is configured for supplying the buffered third slot data to the single-ported cache data memory via the buffer output.