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We propose an MRAM macro architecture for SoCs to reduce their area size. The .shared write-selection transistor (SWST) architecture is based on 2T1MTJ MRAM cell technology', which enables the same fast access time as and with smaller cell area than that of 6T SRAMs. We designed a 4-Mb macro using the SWST architecture with a 0.15-mum CMOS process and a 0.24-mum MRAM process. The macro cell array consists of 81T64MTJ cell array elements, each storing 64 hits of data. Area size is reduced by more than 30%. By introducing a leakage-replication (LR) read scheme, 50-ns access time is achieved with SPICE simulation. The 2T1MTJ macro and 81T64MTJ macro can be integrated into a single SoC.