Electronic device, determine a setting of a host device for communication in a subsequent phase

An information processing system, comprising:

• a storage device;
• a host configured to communicate with the storage device;
• and
• an interface connecting the storage device and the host, wherein the storage device includes:
• a reception circuit configured to receive data from the host through the interface;
• a transmission circuit configured to transmit to the host through the interface;
• and
• a control circuit configured to:
• execute a link equalization sequence between the host and the storage device at a first communication speed and a second communication speed, the first communication speed conforming to a first specification, the second communication speed being different from the first communication speed and conforming to a second specification, the link equalization sequence including at least a first phase and a second phase, the first phase being a part of the link equalization sequence in which the control circuit adjusts a setting of the reception circuit without requesting the host to adjust a setting of a transmission circuit of the host, the second phase being another part of the link equalization sequence in which the control circuit adjusts the setting of the reception circuit while requesting the host to adjust the setting of the transmission circuit of the host,
• in a first state in which the second phase of the link equalization sequence at the first communication speed is executed, determine, based on first information and second information, information on a first request that includes the setting of the transmission circuit of the host to be set as an initial setting in a second state in which the first phase of the link equalization sequence at the second communication speed is executed,
• the first information including information on a second request of the setting of the transmission circuit of the host,
• the second information including information on a quality of a signal received by the reception circuit, the signal having been transmitted from the transmission circuit of the host based on the first information;
• and
• transmit the determined information from the transmission circuit to the host.

A method of shifting a storage device including a reception circuit and a transmission circuit from a first state to a second state, the reception circuit configured to receive data from a host through an interface, the transmission circuit configured to transmit data to the host through the interface, the method comprising:

• executing a link equalization sequence between the host and the storage device at a first communication speed and a second communication speed, the first communication speed conforming to a first specification, the second communication speed being different from the first communication speed and conforming to a second specification, the link equalization sequence including at least a first phase and a second phase, the first phase being a part of the link equalization sequence in which a setting of the reception circuit is adjusted without requesting the host to adjust a setting of a transmission circuit of the host, the second phase being another part of the link equalization sequence in which the setting of the reception circuit is adjusted while requesting the host to adjust the setting of the transmission circuit of the host in the first state in which the second phase of the link equalization sequence at the first communication speed is executed, determining, based on first information and second information, information on a first request that includes the setting of the transmission circuit of the host to be set as an initial setting in the second state in which the first phase of the link equalization sequence at the second communication speed is executed, the first information including information on a second request of the setting of the transmission circuit of the host, the second information including information on a quality of a signal received by the reception circuit, the signal having been transmitted from the transmission circuit of the host based on the first information and;
• and
• transmitting the determined information from the transmission circuit to the host.