at91rm3400 ATMEL Corporation, at91rm3400 Datasheet - Page 395

• Manufacturer Part Number: at91rm3400
• Description: Atmel Advanced At91 Arm Microcontroller
• Manufacturer: ATMEL Corporation

USB Device Port (UDP)
Overview
1790A–ATARM–11/03
The USB Device Port (UDP) is compliant with the Universal Serial Bus (USB) V2.0 full-speed
device specification. It is designed to be associated with Atmel’s embedded USB transceiver
and interfaced with an
The number and size of endpoints is product-dependent. Each endpoint is 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.
Suspend and resume are automatically detected by the USB device, which notifies the pro-
cessor by raising an interrupt. Depending on the product, an external signal can be used to
send a wake-up to the USB host controller.
The main features of the UDP are:
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USB V2.0 Full-speed Compliant, 12 Mbits per second
Embedded USB V2.0 Full-speed Transceiver
Embedded Dual-port RAM for Endpoints
Suspend/Resume Logic
Ping-pong Mode (2 Memory Banks) for Isochronous and Bulk Endpoints
ARM7TDMI and ARM9TDMI core
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