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Processing-Using-DRAM (PUD) leverages the inherent analog operational characteristics of DRAM to enable highly parallel bit-serial computations directly within memory arrays. Prior research has demonstrated that commercial off-the-shelf DRAM can achieve PUD functionality without hardware modifications by intentionally violating the timing parameters.
These studies have established two fundamental PUD operations: RowCopy and majority-of-X (MAJX) (Fig. 1). The RowCopy operation facilitates data movement between different rows within a subarray by issuing a PRE command followed immediately by an ACT command before bitline precharging completes, enabling data transfer through the bitlines. This operation affects all cells along a row simultaneously, making it approximately 100 times faster than processor-mediated data movement. The MAJX operation performs a majority vote among X cells sharing the same bitline that are activated simultaneously, implemented in commercial DRAM by issuing ACT, PRE, and ACT commands in rapid succession without delays. This allows concurrent activation of 2∼32 rows. MAJX enables bit-serial computations that leverage the parallelism of subarrays with 65,536 columns, serving as the fundamental computational unit for PUD.
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