US 4,727,510 AGranted

System for addressing a multibank memory system

AssigneeUnisys Corporation

InventorsJames H. Scheuneman, John R. Trost

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Abstract

The preferred embodiment shown involves forming the memory system of B memory banks, where B is preferably a prime number, but may be a nonbinary number, i.e., B=2.sup.X, where X is a positive integer, and where the requested address=(Q+R)B. The address translation system for each requestor seeking access to the memory system includes a ROM and an adder. The ROM is comprised of two ROMs, Q ROMa and Q ROMb. ROMb stores in successive memory locations a first portion Qb of the memory system address and Q ROMa stores in successive memory locatins a second portion Qa of the memory system address. An adder sums the data, Qa+Qb, stored in the addressed memory locations of Q ROMa and Q ROMb while Q ROMa stores in successive memory locations a Bank R portion that specifies the one of the B banks in which the sum Qa+Qb addresses the selected memory address in the selected memory bank of the memory system.

Claims11

Dependent claims

A method of addressing a multibank memory system, comprising the steps of:

forming a memory system of a plurality of B memory banks, each having the same plurality of memory locations with data words stored therein and a priority network;
forming a memory address translation system of a plurality of N ROM's each of said N ROM's including addressing means;
forming the data words stored in the memory locations in each of said ROM's of an address portion Qa that is representative of a requested memory address and a requested one of said B memory banks and of a bank R portion that specifies the one of the B memory banks in which the requested memory address is to have access, said Bank R portion comprised of B bits, wherein B is not a power of 2, i.e., B=2.sup.X where X is a positive integer, only one of which is active for initiating and selecting only one of said B memory banks;
coupling requested memory addresses to the addressing means from a memory requesting means of the selected ROM's;
coupling the address portion Qa from each of said addressed ROM's to an address multiplexer;
individually coupling one of the B bits of the bank R portion of each of said addressed ROM's to the priority network included in each of said plurality of B memory banks;
simultaneously generating in each of said priority networks, from said Bank R portion, a priority enable code and a memory initiate signal when said priority network has been activated by an active one of the B bits of a Bank R portion;
and
coupling the priority enable code from each of said activated priority networks to said address multiplexer for coupling the prioritized one of said address portions Qa to the selected one of said B memory banks which has been initiated by said memory initiate signal for addressing the addressed one of said memory locations in said selected one of said B memory banks.

6 more elements

A method of addressing a multibank memory system, comprising the steps of:

forming a memory system of a plurality of B memory banks, each having the same plurality of memory locations and a priority network;
forming a memory address translation system of a plurality of N ROM's each of which has an addressing means and an adder means of a Q ROMa and a Q ROMb;
forming the data words stored in the memory locations in each of said Q ROMb's of an address portion Qb that specifies a requested memory address in a requested one of said B memory banks;
forming the data words stored in the memory locations in each of said Q ROMa's of an address portion Qa that specifies a requested memory address in a requested one of said B memory banks and of a Bank R portion that specifies the one of the B memory banks in which the requested memory address is to have access, said Bank R portion comprised of B bits, only one of which B bits is active for selectively activating only one of said B memory banks;
coupling a request memory address to the addressing means of the selected one of said N ROM's from a memory requesting means;
coupling the address portions Qb and Qa of the addressed ROM to the adder means;
performing the sum Qb+Qa in said adder means;
coupling the sum Qb+Qa from said adder means to an address multiplexer;
coupling each B bit of the Bank R portion of said addressed ROM to one of said priority networks;
simultaneously generating in each of said priority networks from said Bank R portion, a priority enable code and a memory initiate signal when said priority network has been activated by an active one of said Bank R portion;
and,
coupling the priority enable code from said activated priority network to said address multiplexer for coupling the prioritized Qb+Qa sum to the selected one of said B memory banks which has been initiated by said memory initiate signal for addressing the addressed one of said memory locations in said selected one of said B memory banks.

9 more elements

A method of addressing a multibank memory system, comprising:

forming a memory system of a plurality of B memory banks, each having the same plurality of memory locations and a priority network;
forming a memory address translation system of a plurality of N ROM's, each having an adder network and an addressing means;
forming each of said N ROM's of a Q ROMa and a Q ROMb;
forming the data words stored in the memory locations in each of said Q ROMb's of an address portion Qb that is representative of a requested memory address in a requested one of said B memory banks;
forming the data words stored in the memory locations in each of said Q ROMa's of an address portion Qa that is representative of a requested memory address in a requested one of said B memory banks and of a bank R portion that specifies the one of the B memory banks in which the requested memory address is to have access, said Bank R portion comprised of B bits, only one of which B bits is active or initiating and selecting only one of said B memory banks;
addressing one or more of said ROM's by coupling memory address words to their respective addressing means from a memory requesting means;
coupling the address portions Qb and Qa of the addressed ROM's to their respective adder networks;
performing the sum Qb and Qa in each of said adder networks;
coupling the sum Qb and Qa from said adder networks to an address multiplexer;
coupling each B bit of the Bank R portion of each of said addressed ROM's to a corresponding one of said priority networks;
simultaneously generating in each of the priority networks, from said Bank R portion, a priority enable code and a memory initiate signal when the priority network has been activated by an active one of the Bank R portion B bits;
and,
coupling the priority enable codes from said activated priority networks to said address multiplexer for coupling each prioritized one of said Qb+Qa sums to the selected one of said B memory banks which has been initiated by said memory initiate signal for addressing the selected one of said memory locations in said selected one of said B memory banks.

10 more elements

A system for addressing a multibank memory system, comprising:

a memory system comprised of a plurality of B memory banks, each having the same plurality of memory locations and a priority network;
a plurality of N memory address translation systems each having a ROM and an adder network;
each of said N ROM's comprised of a Q ROMa and a Q ROMb;
each of said Q ROMb's having stored in its memory locations an address portion Qb that is representative of a requested memory address in a requested one of said B memory banks;
each of said Q ROMa's having stored in its memory location an address portion Qa that is representative of a requested memory address in a requested one of said B memory banks and a Bank R portion that specifies the one of the B memory banks in which the requested memory address is to have access, said Bank R portion comprised of B bits, only one of which B bits is active for initiating and selecting only one of said B memory banks;
means for coupling memory address words from a memory requesting means to one or more of said ROM's including further means for coupling the address portion Qb and Qa of each of the selected ROM's to its adder portion network;
address multiplexer means;
means for coupling the sums Qb+Qa from said adder networks to said address multiplexer means;
means for coupling each of the B bits of each of Bank R portions of each of said Q ROMa's to the corresponding one of said priority networks;
each of said priority networks simultaneously generating a priority enable code and a memory initiate signal when the priority network has had coupled thereto an active one of said Bank R portion B bits;
and,
means for coupling the priority enable code from each of said activated priority networks to said address multiplexer means for coupling each prioritized one of said Qb+Qa sums to the selected one of said B memory banks which has been initiated by said memory initiate signal for addressing the selected one of said memory locations in the selected one of said B memory banks.

9 more elements

Dependencies are inferred from the claim text.