Providing command queuing in embedded memories
Providing command queuing in embedded memories is provided. In particular, aspects disclosed herein relate to a process through which a status of the queue is communicated to a host from a device. Aspects of the present disclosure use the command structure of the embedded Multi-Media Card (eMMC) standard, such that the host may determine a state of the queue in the device proximate a known end of an in-progress data transfer. In this manner, the host can select a task to commence after completion of a current data transfer while the current data transfer is still ongoing.
1. A host comprising:
a transceiver configured to transmit signals to and receive signals from a device compliant with an embedded Multi-Media Card (eMMC) standard; and
a control system operably coupled to the transceiver and configured to:
issue a command to the device to determine a state of a queue status register (QSR) in the device;
determine an upcoming end to a current data transfer from the device; and
receive a response from the device with information about the QSR of the device before the upcoming end.
2. The host of claim 1 , wherein the control system is further configured to issue the command proximate in time to and before the upcoming end.
3. The host of claim 1 , wherein the control system is further configured to issue a command to queue a task.
4. The host of claim 1 , wherein the control system is further configured to issue a queue management request.
5. The host of claim 4 , wherein the queue management request is a command to discard a task.
6. The host of claim 1 , wherein the control system is further configured to issue an execute read task command.
7. The host of claim 1 , wherein the control system is further configured to issue an execute write task command.
8. The host of claim 1 integrated into a device selected from the group consisting of: a set top box, an entertainment unit, a navigation device, a communications device, a fixed location data unit, a mobile location data unit, a mobile phone, a cellular phone, a computer, a portable computer, a desktop computer, a personal digital assistant (PDA), a monitor, a computer monitor, a television, a tuner, a radio, a satellite radio, a music player, a digital music player, a portable music player, a digital video player, a video player, a digital video disc (DVD) player, and a portable digital video player.
9. A device comprising:
a transceiver configured to transmit signals to and receive signals from a host compliant with an embedded Multi-Media Card (eMMC) standard; and
a control system operably coupled to the transceiver and configured to:
receive a command from the host to determine a state of a queue status register (QSR) in the device; and
transmit a response to the host with information about the QSR of the device before an upcoming end to a current data transfer from the device.
10. The device of claim 9 , wherein the control system is further configured to determine the state of the QSR in the device before transmitting the response.
11. The device of claim 9 , wherein the control system is further configured to receive a command to queue a task.
12. The device of claim 9 , wherein the control system is further configured to receive a queue management request.
13. The device of claim 12 , wherein the queue management request is a command to discard a task.
14. The device of claim 9 , wherein the control system is further configured to receive an execute read task command.
15. The device of claim 9 , wherein the control system is further configured to receive an execute write task command.
16. A method of operating an embedded Multi-Media Card (eMMC) host, comprising:
transmitting signals from an eMMC host to a device including a command to determine a state of a queue status register (QSR) in the device;
determining an upcoming end to a current data transfer from the device; and
receiving a response from the device with information about the QSR of the device before the upcoming end.
17. The method of claim 16 , further comprising issuing the command proximate in time to and before the upcoming end.
18. The method of claim 17 , further comprising receiving the response before the upcoming end.
19. The method of claim 16 , further comprising issuing a command to queue a task.
20. The method of claim 16 , further comprising issuing a queue management request.
21. The method of claim 20 , wherein issuing the queue management request comprises commanding the device to discard a task.
22. The method of claim 16 , further comprising issuing an execute read task command.
23. The method of claim 16 , further comprising issuing an execute write task command.