Memory reuse for multiple endpoints in USB device
View Patent ↗In a system in which individual memory banks may be under individual power control, a subsequent need for a memory bank that is currently in a low power state may be anticipated, so that the memory bank may be powered up in advance of when it is needed, to reduce or eliminate delays caused by waiting for the memory bank to power up and become operational. The anticipation may be based on accessing a predetermined location in another memory bank.
1. A method comprising:
calculating a USB endpoint memory map for a plurality of active endpoints;
monitoring a change to a configuration, an interface, or an alternate interface activated by a USB host controller;
allocating endpoint data in a USB endpoint memory in response to the monitoring and the calculating.
2. The method according to claim 1 , wherein the calculating determines a USB endpoint memory map for each configuration, interface and alternate interface setting that has an active endpoint.
3. The method according to claim 1 , further comprising notifying a user when the configuration, interface, or alternate interface are changed.
4. The method according to claim 1 , wherein the allocating changes the USB endpoint memory with a calculated memory map corresponding to the change.
5. The method according to claim 1 , wherein the allocating changes the USB endpoint memory to store data only for endpoints that are active for the current configuration, interface and alternate interface.
6. The method according to claim 1 , wherein the configuration, interface, and alternate interface are selected by a USB host controller.
7. A USB device comprising:
a USB endpoint memory; and
a device controller to calculate a USB endpoint memory map for a plurality of active endpoints, to monitor a change to a configuration, an interface, or an alternate interface, activated by a USB host controller and to allocate endpoint data in the USB endpoint memory in response to the change and to the USB endpoint memory maps.
8. The USB device according to claim 7 , wherein the device controller is to calculate a USB endpoint memory map for each configuration, interface and alternate interface setting that has an active endpoint.
9. The USB device according to claim 7 , wherein the device controller is to notify a user when the configuration, interface, or alternate interface are changed.
10. The USB device according to claim 7 , wherein the device controller is to allocate the USB endpoint memory with a calculated memory map corresponding to the change.
11. The USB device according to claim 7 , wherein the device controller is to allocate the USB endpoint memory to store data only for endpoints that are active for the current configuration, interface and alternate interface.
12. The USB device according to claim 7 , where in the configuration, interface and alternate interface are selected by a USB host controller.
13. A system comprising:
a USB host device;
a USB client device including a USB endpoint memory; and
a device controller to calculate a USB endpoint memory map for a plurality of active endpoints, to monitor a change to a configuration, an interface, or an alternate interface, activated by a USB host controller and to allocate endpoint data in the USB endpoint memory in response to the change and to the USB endpoint memory maps.
14. The system according to claim 13 , wherein the device controller is to calculate a USB endpoint memory map for each configuration, interface and alternate interface setting that has an active endpoint.
15. The system according to claim 13 , wherein the device controller is to notify a user when the configuration, interface, or alternate interface are changed.
16. The system according to claim 13 , wherein the device controller is to allocate the USB endpoint memory with a calculated memory map corresponding to the change.
17. The system according to claim 13 , wherein the device controller is to allocate the USB endpoint memory to store data only for endpoints that are active for the current configuration, interface and alternate interface.
18. The system according to claim 13 , the USB host device further comprising a USB host controller to select the configuration, interface, and alternate interface.
19. The system according to claim 13 , wherein the device controller is included in the USB client device.
20. The system according to claim 13 , further comprising a USB cable to couple the USB host device to the USB client device.
21. An article comprising:
a computer readable medium having instructions thereon which when executed cause a computer to:
calculate a USB endpoint memory map for a plurality of active endpoints;
monitor a change to a configuration, an interface, or an alternate interface activated by a USB host controller;
allocate endpoint data in a USB endpoint memory in response to the monitoring and the calculating.
22. The article according to claim 21 , the computer readable medium further having instructions thereon which when executed cause a computer to calculate the USB endpoint memory map for each configuration, interface and alternate interface setting that has an active endpoint.
23. The article according to claim 21 , the computer readable medium further having instructions thereon which when executed cause a computer to notify a user when the configuration, interface, or alternate interface are changed.
24. The article according to claim 21 , the computer readable medium further having instructions thereon which when executed cause a computer to allocate the USB endpoint memory with a calculated memory map corresponding to the change.
25. The article according to claim 21 , the computer readable medium further having instructions thereon which when executed cause a computer to allocate the USB endpoint memory to store data only for endpoints that are active for the current configuration, interface and alternate interface.