M38K09RFS datasheet(44/328 Pages) RENESAS

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FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 05, 2006

page 27 of 112

38K0 Group

REJ09B0337-0200

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

(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.

USB Function Control Circuit

DCU control

DCU status

MIF control

SIE control

SIE status

Transmit/Receive

data

D0+

D0-

Multi-Channel RAM

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