Atmel AT85DVK-07 Especificaciones descargar pdf (Pagina 91)

AT85C51SND3Bx

7632A–MP3–03/06

• First, Pipe/Endpoint 0 to Pipe/Endpoint 5 are configured, in the growing order. The

memory of each is reserved in the DPRAM.

• Then, the Pipe/Endpoint 3 is disabled (EPEN=0), but its memory reservation is

internally kept by the controller.

• Its ALLOC bit is cleared: the Pipe/Endpoint 4 “slides” down, but the Pipe/Endpoint 5

does not “slide”.

• Finally, if the firmware chooses to reconfigure the Pipe/Endpoint 3, with a bigger

size. The controller reserved the memory after the endpoint 2 memory and

automatically “slide” the Pipe/Endpoint 4. The Pipe/Endpoint 5 does not move and a

memory conflict appear, in that both Pipe/Endpoint 4 and 5 use a common area.

The data of those endpoints are potentially lost.

Notes: 1. the data of Pipe/Endpoint 0 are never lost whatever the activation or deactivation of

the higher Pipe/Endpoint. Its data is lost if it is deactivated.

2. Deactivate and reactivate the same Pipe/Endpoint with the same parameters does

not lead to a “slide” of the higher endpoints. For those endpoints, the data are

preserved.

3. CFGOK is set by hardware even in the case that there is a “conflict” in the memory

allocation.

PAD suspend Figure 55 and Figure 56 illustrate the pad behaviour:

• In the “idle” mode, the pad is put in low power consumption mode.

• In the “active” mode, the pad is working.

Figure 55. Pad Behaviour State Machine

The SUSPI flag indicates that a suspend state has been detected on the USB bus. This

flag automatically puts the USB pad in Idle state. The detection of a non-idle event sets

the WAKEUPI flag and wakes-up the USB pad.

Figure 56. Pad Behavior Waveforms

Moreover, the pad can also be put in the “idle” mode if the DETACH bit is set. It come

back in the active mode when the DETACH bit is cleared.

Idle mode

Active mode

USBE=1

& DETACH=0

& suspend

USBE=0

| DETACH=1

| suspend

Pad Status

WAKEUPI

SUSPI

Active

ActiveIdle

Suspend detected

pad => Idle state

Resume detected

pad => Active state

Clear Resume by software

Clear Suspend by software

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