In modern digital systems on a chip the amount of the built-in memory occupies a significant area, which causes the new manufacturing defects and reduces the percentage of the output of usable systems. The architecture of the built-in self-repair tools, providing the recovery of the system RAM on a chip in case of the multiple failures due to configuration of the main and back-up memory, has been proposed. The built-in means of self-repair of the system RAM on a chip contain a digital automatic machine and means of reconfiguration of the main and backup memory. The verification of the project of the built-in RAM self-repair tools with the automatic recovery of performance in case of four-fold failures has been performed. The proposed technical solution reduces the weight of the product compared to the devices with majority redundancy, since not all memory is entirely reserved, but only the main components that are most prone to failures. The restoration of the working state of the digital system memory on a chip is performed automatically without participation of personnel. The consumers of the built-in RAM self-repair tools can be large-scale manufacturers of the digital systems aimed at the market of industrial and special applications, including those for aerospace systems with long active life