38K2 datasheet(46/358 Pages) RENESAS

46 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 27 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

USB Function Control Circuit (USBFCC) Block

Diagram

The following diagram shows the USBFCC block diagram. The cir-

cuit comprises:

(1) Serial Interface Engine (SIE)

(2) Device Control Unit (DCU)

(3) Internal Memory Interface (MIF)

(4) CPU Interface (CIF)

Fig. 24 USB Function Control Circuit (USBFCC) block diagram

USB Function Control Circuit

DCU control

DCU status

MIF control

SIE control

SIE status

Transmit/Receive

data

D0+

D0-

Multi-Channel RAM

(1) Serial Interface Engine (SIE)

The SIE performs the following USB lower-layer protocols (pack-

ets, transactions):

•Sampling of receive data and clock, generation of transmit clock

•Serial-to-parallel conversion of transmit/receive data

•NRZI (Non Return Zero Invert) encode/decode

•Bit stuffing/unstuffing

•SYNC (Synchronization Pattern) detection, EOP (End of

Packet) detection

•USB address detection, endpoint detection

•CRC (Cyclic Redundancy Check) generation and checking

(2) Device Control Unit (DCU)

The DCU manages the following USB upper-layer protocols (ad-

dress/endpoint and control-transfer sequence):

•Status control for each endpoint

•Control-transfer sequence control

•Memory interface status control

(3) Memory Interface (MIF)

The MIF controls the flow of data transfer between the SIE and the

multi-channel RAM under the management of the DCU.

(4) CPU Interface (CIF)

The CIF performs the following functions:

•Mode setting via registers, DCU control signal generation, DCU

status signal reading

•Interrupt signal generation

•Internal bus interface control.

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