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US 8,711,652 B2Granted
Arbitration for memory device with commands
AssigneeSamsung Electronics Co., Ltd.
InventorsYoung-Min Lee, Sung-Jae Byun, Han-Gu Sohn, Gyoo-Cheol Hwang
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Abstract
A plurality of masters arbitrate for access to a shared memory device, such as a SDRAM (synchronous dynamic random access memory), amongst themselves using software and arbitration interfaces. The masters generate additional commands upon arbitration, such as MRS and PALL commands, for prevention of collision of commands, refresh starvation, and/or a missing pre-charge operation in the shared memory device.
Claims14
A method of performing refresh operations in a shared memory device comprising:
- receiving an indication of change of port authority between multiple ports of the shared memory device;
- and
- activating by the shared memory device an internal refresh operation at a transition in port authority.
An electronic system comprising:
- a plurality of masters;
- and
- a shared memory device that is shared for access by the plurality of masters, the shared memory device including:
- a plurality of ports each used for respective access to the shared memory device by a respective one of the plurality of masters;
- and
- an access controller that receives an indication of change of port authority between the ports for activating an internal refresh operation in the shared memory device at a transition in port authority.
3 more elements
Dependencies are inferred from the claim text.