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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

1.21 UNIVERSAL SERIAL BUS

The Universal Serial Bus (USB) has the following fea-

tures:

•Complete USB Specification (version 1.1) Compatibility

•Error Handling capabilities

•FIFOs:

•Endpoint 0:

IN 16-byte OUT 16-byte

•Endpoint 1:

IN 512-byte OUT 800-byte

•Endpoint 2:

IN 32-byte OUT 32-byte

•Endpoint 3:

IN 16-byte OUT 16-byte

•Endpoint 4:

IN 16-byte OUT 16-byte

•Five independent IN endpoints

•Five independent OUT endpoints

•Complete Device Configuration

•Supports All Device Commands

•Supports Full-Speed Functions

•Support of All USB Transfer Types:

•Isochronous

•Bulk

•Control

•Interrupt

•Suspend/Resume Operation

•On-chip USB Transceiver with voltage converter

•Start-of-frame interrupt and output pin

1.21.1 USB Function Control Unit (USBFCU)

The implementation of the USB by this device is ac-

complished chiefly through the device’s USB Function

Control Unit. The Function Control Unit’s overall pur-

pose is to handle the USB packet protocol layer. The

Function Control Unit notifies the MCU that a valid to-

ken has been received. When this occurs, the data

portion of the token is routed to the appropriate FIFO.

The MCU transfers the data to, or from, the host by

interacting with that endpoint’s FIFO and CSR regis-

ter (see Figure 1.51).

The USB Function Control Unit is composed of five

sections:

•Serial Interface Engine (SIE)

•Generic Function Interface (GFI)

•Serial Engine Interface Unit (SIU)

•Microcontroller Interface (MCI)

•USB Transceiver

1.21.1.1 Serial Interface Engine

The SIE interfaces to the USB serial data and handles

deserialization/serialization of data, NRZI encoding/

decoding, clock extraction, CRC generation and

checking, bit stuffing, and other specifications pertain-

ing to the USB protocol such as handling inter-packet

time-outs and PID decoding 1.

1.21.1.2 Generic Function Interface

The GFI handles all USB standard requests from the

host through the control endpoint (endpoint 0), and

handles Bulk, Isochronous and Interrupt transfers

through Endpoints 1-4. The GFI handles read pointer

reversal for re-transmission of the current data set;

write pointer reversal for re-reception of the last data

set, and data toggle synchronization.

1.21.1.3 Serial Engine Interface Unit

The SIU block decodes the Address and Endpoint

fields from the USB host.

1.21.1.4 Microcontroller Interface Unit

The MCI block handles the microcontroller interface

and performs address decoding and synchronization

of control signals.

1.21.1.5 USB Transceiver

The USB transceiver, designed to interface with the

physical layer of the USB, is compliant with the USB

Specification (version 1.1) for high speed devices. It

consists of two 6-ohm drivers, a receiver, and Schmitt

triggers for single-ended receive signals.

SIU

D+

CPU

MCI

SIE

D-

GFI

Fig. 1.51. USB Function Control Unit Block Diagram

50

FIFOs

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