Memory system capable of increasing data transfer efficiency

摘要

According to one embodiment, a host controller includes a command generator and detector. The command generator generates a command having a retransmission flag in an argument, and transmits the generated command to a memory device. The detector detects timeout if a response from the memory device cannot be recognized within a defined time. When transmitting an initial command, the host controller clears the retransmission flag and transmits the command. If the detector detects timeout, the host controller sets the retransmission flag, and retransmits the same command as the initial command to the device. If a normal response corresponding to the initial command or retransmitted command is received, the host controller recognizes that the command is correctly executed.

主权项

1. A device comprising:
a transmission unit configured to be controlled by commands being received, and to transmit a response to each of the commands within a defined time, the commands each having a retransmission flag in an argument; and an error detection unit which detects a bit error, wherein the commands include a first command and a second command which is received after the first command, the retransmission flag of the first command is reset, the retransmission flag of the second command is set, and the second command has the same contents as the first command, if the second command is recognizable and the retransmission flag has been set, and when the first command is being executed, the device returns a normal response; and if the second command is recognizable, and the retransmission flag has been set, and when the first command is not being executed, the device returns a normal response if the second command can be executed, or returns an error response if the second command cannot be executed.