A device including a controller coupled to memory components via a forward data path, and a signature register coupled to the memory components via a backward data path. The controller provides memory address signals and a controller clock signal to the memory components via the forward data path, which includes first circuitry to provide test-enable signals to the memory components that enable the memory components to read stored memory values. The backward data path includes second circuitry to receive from the memory components a set of memory signals and combine them into a combined signal. Each memory signal is associated with a respective one of the memory components and includes at least one stored memory value read from the corresponding memory component. The signature register calculates a test signature based on the combined signal and compares the test signature to an expected signature.