7643 datasheet(217/424 Pages) RENESAS

217 / 424 page

Rev.2.00

Aug 28, 2006

page 96 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

The 7643 Group USB Function Control Unit (USB FCU) complies with the Full-Speed USB2.0 Specification,

which defines the following four USB transfer types.

q Control transfer

q Interrupt transfer

q Bulk transfer

q Isochronous transfer

The 7643 Group default transfer mode is the bulk transfer. Interrupt (rate feedback) transfer is performed

by endpoints 1 and 2, which need to be initialized accordingly. Control transfer is only performed by

endpoint 0; the transfer format is the same as that of the bulk transfer.

To use a USB interrupt, set the USB enable bit (USBC7) to “1”.

This paragraph explains the registers setting method and the notes related to USB.

2.6.1 USB outline

(1)

Transfer types

The USB specification is generally divided into two sections: the host side (PC, Hub) which

controls the peripherals, and the peripheral side (devices), indicating the peripherals that are

connected to the host. In addition, the peripheral side has two communication (transfer) specifications

which are applied according to the data to be transferred: the Full-Speed function supports high

transfer speeds (12Mbps) for peripherals requiring large amounts of data transferred at one time

(images, voice, etc.) and the Low-Speed function supports lower transfer speeds (1.5Mbps) for

peripherals sending smaller amounts of data (keyboard, mouse, etc). The recent addition of the

Hi-Speed function (480Mbps) specification allows for even faster data transfer.

The communication specification to be used is determined by the Device Class of the peripheral,

and the transfer type is determined according to each peripheral device.

The 7643 Group is equipped with a Full-Speed Function Control Unit, which supports the following

three transfer types.

Control transfer

Control transfer is a request-response, bi-directional transfer in the non-periodic and bursty

communications. These are typically used during setup. As all devices must support standard

device requests, all USB products support control transfers with no exception.

Bulk transfer

Bulk transfer is a non-periodic and bursty communication which is not adversely affected by

delays. These are typically used for transfers of large amounts of data. To ensure that the data

is transferred successfully, hardware is set to check for errors. If an error is detected, the data is

resent. Examples of bulk transfer are word data to printers and image data from scanners.

Interrupt transfer

Interrupt transfer is used to inform the host of periodic, low-frequency data communication from

the device. For example, interrupt transfer informs the host that the printer is out of paper or send

data from the mouse or keyboard to the host.

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