Read-modify-write memory using read-or-write banks
View Patent ↗Minimal memory access times are realized by using a single access to a read-modify-write bank. read-modify-write memory including at least one read-or-write bank is operated in a manner that uses at most one access to each of the at least one read-or-write banks for each read-modify-write access to the memory during a memory cycle. The access can be effected during a single clock cycle and can be used for read, write and read-modify-write memory access.
1. A circuit arrangement for providing read-modify-write memory for a system having row address lines and bank address lines, the circuit arrangement comprising:
a memory having at least one read-or-write bank electrically coupled to a read-modify-write bank having a tag that indicates a read-or-write bank to which data in the read-modify-write bank belongs;
a modify logic for modify data during a read-modify-write operation;
a comparator; and
a multiplexer;
wherein:
the tag accepts inputs from the row and bank address lines and delivers output to the comparator;
the read-modify-write bank accepts inputs from the row address lines and modify logic and delivers output to the multiplexer;
the at least one read-or-write bank accepts inputs from the row address lines, the bank address line, the tag and the read-modify-write bank and delivers output to the multiplexer; and
the comparator accepts inputs from the bank address lines and the tag and delivers an output for controlling the multiplexer.