The MX23L1651 is a CMOS 16,777,216 bit serial Mask ROM, which is configured as 2,097,152 x 8 internally. The MX23L1651 features a serial peripheral interface and software protocol allowing operation on a simple 3- wire bus. The three bus signals are a clock input (SCLK), a serial data input (SI), and a serial data output (SO). Serial peripheral interface access to the device is enabled by CS input.