US 2017/0286331 A1Published application

Synchronization processing unit, device, and system

AssigneeNEC Corporation

InventorsYuusuke KOBAYASHI, Yohei YAMADA

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Abstract

Disclosed are a synchronization processing unit etc. including a command determination unit that determines whether the memory access command is a command for synchronization processing; a completion determination unit that determines whether a memory access command is complete; an issuance unit configured to issue a memory access command determined not to be for the synchronization processing to the memory, and that suspends issuance of a memory access command determined to be for the synchronization processing until completion of a preceding memory access command received before the memory access command for the synchronization processing is determined and then issues the suspended memory access command; and a subsequent control unit that, during a period from the suspension of the memory access command to the issuance and then completion thereof, performs control so that a subsequent memory access command is not received from the external device and the processor in the device.

Claims13

Dependent claims

A synchronization processing unit comprising:

a command determination unit configured to, upon receipt of a memory access command for accessing memory in a device including the synchronization processing unit from an external device connected to the device by an extension bus or from a processor in the device, determine whether or not the memory access command is a command for synchronization processing for instructing synchronization processing;
a completion determination unit configured to determine whether a memory access command issued to the memory is complete or not;
an issuance unit configured to issue a memory access command determined not to be for the synchronization processing to the memory, and that suspends issuance of a memory access command determined to be for the synchronization processing until completion of a preceding memory access command received before the memory access command for the synchronization processing is determined by the completion determination unit and then issues the suspended memory access command;
and
a subsequent control unit configured to, during a period from the suspension of the memory access command for the synchronization processing to the issuance and then completion thereof, perform control so that a subsequent memory access command is not received from the external device and the processor in the device.

2 more elements

A device comprising:

a synchronization processing unit including:
a command determination unit configured to, upon receipt of a memory access command for accessing memory in a device including the synchronization processing unit from an external device connected to the device by an extension bus or from a processor in the device, determine whether or not the memory access command is a command for synchronization processing for instructing synchronization processing;
a completion determination unit configured to determine whether a memory access command issued to the memory is complete or not;
an issuance unit configured to issue a memory access command determined not to be for the synchronization processing to the memory, and that suspends issuance of a memory access command determined to be for the synchronization processing until completion of a preceding memory access command received before the memory access command for the synchronization processing is determined by the completion determination unit and then issues the suspended memory access command;
and
a subsequent control unit configured to, during a period from the suspension of the memory access command for the synchronization processing to the issuance and then completion thereof, perform control so that a subsequent memory access command is not received from the external device and the processor in the device;
and
the memory;
and
the processor.

7 more elements

A system comprising:

a device including:
a synchronization processing unit including:
a command determination unit configured to, upon receipt of a memory access command for accessing memory in a device including the synchronization processing unit from an external device connected to the device by an extension bus or from a processor in the device, determine whether or not the memory access command is a command for synchronization processing for instructing synchronization processing;
a completion determination unit configured to determine whether a memory access command issued to the memory is complete or not;
an issuance unit configured to issue a memory access command determined not to be for the synchronization processing to the memory, and that suspends issuance of a memory access command determined to be for the synchronization processing until completion of a preceding memory access command received before the memory access command for the synchronization processing is determined by the completion determination unit and then issues the suspended memory access command;
and
a subsequent control unit configured to, during a period from the suspension of the memory access command for the synchronization processing to the issuance and then completion thereof, perform control so that a subsequent memory access command is not received from the external device and the processor in the device;
the memory;
and
the processor;
and
a host device as the external device.

9 more elements

Dependencies are inferred from the claim text.