Table 3-16. Usb I/O; Figure 3-52. Bluetooth Usb Interface To Main Board - Motorola APX 1000 Detailed Service Manual

Theory of Operation
: Bluetooth
The host processor is connected to the 3.3V SDRAM using a synchronous interface. The host
processor is connected to the OMAP on the Main Board by a full-speed USB (D11 & D12). VBus is a
sense line only.
Signal Name
GPIO19
GPIO20
DP
DM
VBUS
The ATMEL bootloader is being used as a first stage bootloader that will jump to the Motorola
bootloader, which is a stage two bootloader. GPIO20 is used by the ATMEL bootloader to trap in
Flash mode. GPIO19 will be used by the Motorola bootloader to trap in Flash mode. Both pins are
active low.

Table 3-16. USB I/O

Pin Name
C12
D10
D11
D12
E12
USB_BOOT
Pin 21
Pin 3
Pin 41
Pin 43
//

Figure 3-52. Bluetooth USB Interface To Main Board

Pad Name Keypad Board
Schematic Name
PA19 USB_BOOT_3.3V
PA20 ATMEL_BOOT
– BT_AVR_USB_DP
– BT_AVR_USB_DM
– BT_AVR_VBUS
Factory Test Points
ATMEL_BOOT
= Level Translator. 3.3 volts on AVR side
I/O
I
I
I/O
I/O
I
ATMEL AVR32
AT32UC3A0512
C12
PA19
E12
VBUS
D11
DP
D12
DM
D10
PA20
3-65