Datasheet

927
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
39. USB Device Port (UDP)
39.1 Description
The USB Device Port (UDP) is compliant with the Universal Serial Bus (USB) V2.0 full-speed device specification.
Each endpoint can be configured in one of several USB transfer types. It can be associated with one or two banks of a
dual-port RAM used to store the current data payload. If two banks are used, one DPR bank is read or written by the
processor, while the other is read or written by the USB device peripheral. This feature is mandatory for isochronous
endpoints. Thus the device maintains the maximum bandwidth (1M bytes/s) by working with endpoints with two banks of
DPR.
Note: 1. The Dual-Bank function provides two banks for an endpoint. This feature is used for ping-pong mode.
Suspend and resume are automatically detected by the USB device, which notifies the processor by raising an interrupt.
Depending on the product, an external signal can be used to send a wake up to the USB host controller.
39.2 Embedded Characteristics
 USB V2.0 full-speed compliant,12 Mbits per second.
 Embedded USB V2.0 full-speed transceiver
 Embedded 2688-byte dual-port RAM for endpoints
 Eight endpoints
 Endpoint 0: 64bytes
 Endpoint 1 and 2: 64 bytes ping-pong
 Endpoint 3: 64 bytes
 Endpoint 4 and 5: 512 bytes ping-pong
 Endpoint 6 and 7: 64 bytes ping-pong
 Ping-pong Mode (two memory banks) for Isochronous and bulk endpoints
 Suspend/resume logic
 Integrated Pull-up on DDP
 Pull-down resistor on DDM and DDP when disabled
Table 39-1. USB Endpoint Description
Endpoint Number Mnemonic Dual-Bank
(1)
Max. Endpoint Size Endpoint Type
0 EP0 No 64 Control/Bulk/Interrupt
1 EP1 Yes 64 Bulk/Iso/Interrupt
2 EP2 Yes 64 Bulk/Iso/Interrupt
3 EP3 No 64 Control/Bulk/Interrupt
4 EP4 Yes 512 Bulk/Iso/Interrupt
5 EP5 Yes 512 Bulk/Iso/Interrupt
6 EP6 Yes 64 Bulk/Iso/Interrupt
7 EP7 Yes 64 Bulk/Iso/Interrupt