Large data read techniques
View Patent ↗Devices and techniques are disclosed herein for more efficiently exchanging large amounts of data between a host and a storage system. In an example, a large read operation can include receiving a pre-fetch command, a parameter list and a read command at a storage system. In certain examples, the pre-fetch command can provide an indication of the length of the parameter list, and the parameter list can provide location identifiers of the storage system from which the read command can sense the read data.
1 . A method for reading data from a NAND memory device, the method comprising:
receiving, via a controller of the NAND memory device, a command from a host device to initiate a type of read operation for a read command, wherein the command comprises a first indication stored in the command, and wherein the first indication indicates a data size of the type of read operation reading from one or more physical addresses of the NAND memory device;
sending, via the controller to the host device, a response to the command to the host device;
receiving, via the controller from the host device, a set of addresses from the host device, wherein the set of addresses are used to retrieve data stored on the NAND memory device;
subsequent to receiving the set of addresses, receiving, via the controller, the read command from the host device, wherein the read command comprises a second indication and one or more location identifiers stored in the read command, wherein the one or more location identifiers are used to retrieve read data stored on the NAND memory device;
in response to the second indication matching the first indication, retrieving, via the controller, the data using the set of addresses and the read data using the one or more location identifiers; and
sending, via the controller, a plurality of messages to the host device transferring the data and the read data to the host device without receiving intervening messages from the host device.
2 . The method of claim 1 , wherein the set of addresses are received as part of a single parameter list message.
3 . The method of claim 1 , wherein the command includes a parameter list length, the parameter list length providing a length of the set of addresses, and wherein the controller verifies that the length of the set of addresses matches a length of the received set of addresses from the host device.
4 . The method of claim 1 , wherein the set of addresses are logical addresses.
5 . The method of claim 1 , wherein the set of addresses are physical addresses.
6 . A NAND memory device comprising:
a controller configured to perform operations comprising:
receiving a command from a host device to initiate a type of read operation for a read command, wherein the command comprises a first indication stored in the command, and wherein the first indication indicates a data size of the type of read operation reading from one or more physical addresses of the NAND memory device;
sending a response to the command to the host device;
receiving a set of addresses from the host device, wherein the set of addresses are used to retrieve data stored on the NAND memory device;
subsequent to receiving the set of addresses, receiving the read command from the host device, wherein the read command comprises a second indication and one or more location identifiers stored in the read command, wherein the one or more location identifiers are used to retrieve read data stored on the NAND memory device;
in response to the second indication matching the first indication, retrieving, via the controller, the data stored at the set of addresses and the read data stored at the one or more location identifiers; and
sending a plurality of messages to the host device transferring the data and the read data to the host device without receiving intervening messages from the host device.
7 . The NAND memory device of claim 6 , wherein the set of addresses are received as part of a single parameter list message.
8 . The NAND memory device of claim 6 , wherein the command includes a parameter list length, the parameter list length providing a length of the set of addresses, and wherein the operations further comprise verifying that the length of the set of addresses matches a length of the received set of addresses from the host device.
9 . The NAND memory device of claim 6 , wherein the set of addresses are logical addresses.
10 . The NAND memory device of claim 6 , wherein the set of addresses are physical addresses.
11 . A non-transitory, machine readable medium, storing instructions, which when executed by a controller of a NAND memory device, cause the controller to perform operations comprising:
receiving a command from a host device to initiate a type of read operation for a read command, wherein the command comprises a first indication stored in the command, and wherein the first indication indicates a data size of the type of read operation reading from one or more physical addresses of the NAND memory device;
sending a response to the command to the host device;
receiving a set of addresses from the host device, wherein the set of addresses are used to retrieve data stored on the NAND memory device;
subsequent to receiving the set of addresses, receiving the read command from the host device, wherein the read command comprises a second indication and one or more location identifiers stored in the read command, wherein the one or more location identifiers are used to retrieve read data stored on the NAND memory device;
in response to the second indication matching the first indication, retrieving, via the controller, the data using the set of addresses and the read data using the one or more location identifiers; and
sending a plurality of messages to the host device transferring the data and the read data to the host device without receiving intervening messages from the host device.
12 . The non-transitory, machine readable medium of claim 11 , wherein the set of addresses are received as part of a single parameter list message.
13 . The non-transitory, machine readable medium of claim 11 , wherein the command includes a parameter list length, the parameter list length providing a length of the set of addresses, and wherein the operations further comprise verifying that the length of the set of addresses matches a length of the received set of addresses from the host device.
14 . The non-transitory, machine readable medium of claim 11 , wherein the set of addresses are logical addresses.