Cypress Semiconductor SL811HS Manual do Utilizador descarregar pdf (Página 30)

Cypress Semiconductor Corporation

SL811HS and SL811HST: Application Notes

and specifications contained in this document are subject to change without

notice.

Date: 07/26/01

Revision: 1.21

Page: 30

USB Trace 5: EOP Packet

4.1.14 Suspend State

When SL811HS is placed in suspend state, it will stop all activity on the USB Bus. Since no

activity is seen downstream, slave devices will also suspend activity.

Program Sample 13: Suspend State

... ...

SL11Write(CtrlReg, 0); // Stop sending SOF SL11Write(CtrlReg, 0); // Stop sending SOF

SL11Write(CtrlReg,0x40); // Suspend enable SL11Write(CtrlReg,0x40); // Suspend enable

... ...

4.1.15 Resume Wakeup

Devices that are in suspend state because of lack of USB activity, will be forced to resume

operation when the SL811HS resumes SOF transmission. The SL811HS will do the following:

- Enable SOF generation

- Disable Suspend states

- Starts normal operation

Program Sample 14: Resume Wakeup

... ...

USBReset(10); // Do USB_RESET USBReset(10); // Do USB_RESET

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Cypress Semiconductor SL811HS Manual do Utilizador Página 30