AT43USB355 datasheet(82/115 Pages) ATMEL

82 / 115 page

AT43USB355

2603G–USB–04/06

Function Address

The USB function contains an address register that contains the function address assigned by

the host. This Function Address Register must be programmed by the microcontroller once it

has received a SET_ADDRESS request from the host and completed the status phase of the

transaction. After power up or reset, this register will contain the value of 0x00.

Function Address Register – FADDR

• Bit 7 – FEN: Function Enable

The Function Enable bit (FEN) allows the firmware to enable or disable the function end-

points. The firmware will set this bit after receipt of a reset through the hub, SetPortFea-

ture[PORT_RESET]. Once this bit is set, the USB hardware passes to and from the host.

When the Single Address bit is set, the condition of FEN is ignored.

• Bit 6..0 – FADD6...0: Function Address[6:0]

End-point Registers

Hub End-point 0 Control Register – HEND-P0_CR

Function End-point 0 Control Register – FEND-P0_CR

• Bit 7 – EPEN: End-point Enable

0 = Disable end-point

1 = Enable end-point

• Bit 6..4 – Reserved

These bits are reserved in the AT43USB355 and will read as zero.

• Bit 3 – DTGLE: Data Toggle

Identifies DATA0 or DATA1 packets. This bit will automatically toggle and requires clearing by

the firmware only in certain special circumstances.

• Bit 2 – EPDIR: End-point Direction

0 = Out

1 = In

• Bit 1, 0 – EPTYPE: End-point Type

These bits must be programmed as 0, 0.

Bit

543

$1FEE

FEN

FADD6

FADD5

FADD4

FADD3

FADD2

FADD1

FADD0

FADDR

Read/Write

R/W

Initial Value

Bit

543

$1FE7

EPEN

–

DTGLE

EPDIR

EPTYPE1

EPTYPE0

HEND-

P0_CR

$24 ($44)

EPEN

–

DTGLE

EPDIR

EPTYPE1

EPTYPE0

FEND-P0_CR

Read/Write

R/W

Initial Value

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