AT91SAM7A3_04 Datasheet, PDF (432/575 Pages) ATMEL Corporation – AT91 ARM Thumb-based Microcontrollers

Read/Write
010
Bulk OUT
110
Bulk IN
011
Interrupt OUT
111
Interrupt IN
• DTGLE: Data Toggle
Read-only
0 = Identifies DATA0 packet.
1 = Identifies DATA1 packet.
Refer to Chapter 8 of the Universal Serial Bus Specification, Rev. 2.0 for more information on DATA0, DATA1 packet
definitions.
• EPEDS: Endpoint Enable Disable
Read:
0 = Endpoint disabled.
1 = Endpoint enabled.
Write:
0 = Disables endpoint.
1 = Enables endpoint.
• RXBYTECNT[10:0]: Number of Bytes Available in the FIFO
Read-only
When the host sends a data packet to the device, the USB device stores the data in the FIFO and notifies the microcontrol-
ler. The microcontroller can load the data from the FIFO by reading RXBYTECENT bytes in the USB_FDRx register.
USB FIFO Data Register
Register Name:
USB_FDRx [x = 0..4]
Access Type:
Read/Write
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
432 AT91SAM7A3 Preliminary
6042A–ATARM–23-Dec-04