Replacer Submodule Documentation

The PLRU replacement algorithm is employed. Considering that each fetch may access consecutive doublelines, two replacers are set up for odd and even addresses, updating the respective replacer during touch and victim operations based on address parity.

PLRU Algorithm Illustration

touch

The Replacer has two touch ports to support dual-line access, with touch operations distributed to the corresponding replacer based on the odd/even address.

victim

The Replacer has only one victim port because only one MSHR writes to the SRAM at a time, similarly retrieving the waymask from the corresponding replacer based on the address parity. The touch operation to update the replacer is performed in the next cycle.