AT43USB370 datasheet(21/50 Pages) ATMEL

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AT43USB370

3340B–USB–12/03

USBP_PORTNUM_REG – Hub’s Port Number Register

The USB processor writes in this register.

• Bit 7:0 - PORT_NUM

Port number of the hub to which the USB device is connected.

• Bit 31:8 - RS

Reserved. Reset to zero by the USB processor.

This register is used by the USB processor to write the port number of the hub to which a USB

device is connected while issuing a request to the system processor software. After power-up

or reset, this register will contain the value of 0x00.

SYSP_PKTSIZE – Packet Size Register

The system processor software writes in this register.

• Bit 15:0 - PKT_SIZE

Packet size in bytes.

• Bit 31:16 - RS

Reserved. Must be reset to zero by the system processor software.

This register is used by the system processor software to specify the Packet Size while issuing

a command to the USB processor. This packet size is used by the USB processor for every

transaction associated with this command. After power-up or reset, this register will contain

the value of 0x00

Bit

0x44

PORT_NUM

USBP_PORTNUM_REG

Read/Write

USB Processor

System Processor

Initial Value

0x0

Mode

Host

Bit

0x48

PKT_SIZE

USBP_PKTSIZE_REG

Read/Write

USB Processor

System Processor

Initial Value

0x0

Mode

Host

AT43USB370 Datasheet(PDF) 21 Page - ATMEL Corporation

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