Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 数据表
产品代码
ATSAM4S-EK2
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.
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.
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
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