CS4103 datasheet(3/24 Pages) NSC

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Architectural Overview

The Geode CS4301 can be described as providing the

functional blocks as shown in Figure 1-1 and described in

the following subsections.

1.1

LINK INTERFACE

The Link Interface implements the PHY-Link Interface as

specified in clause 5, revision 2.0 of the P1394a specifica-

tion. It handles both differentiated and undifferentiated

modes of operation. It decodes LREQ requests and com-

municates with the Arbiter and Register Set for bus

requests and register read/write commands, respectively.

In addition to receiving LREQ requests, the Link Interface

handles the bidirectional control and data buses for packet

transmission and reception as well as register reads. The

Link Interface uses the Link Power Status input (LPS) sig-

nal to determine the operational state of the Geode

CS4210 OHCI Controller and for resetting, disabling, and/

or restoring the PHY-Link Interface. The Link Interface also

controls the Link-On output (LNKON), used to signal the

CS4210 when the PHY-Link Interface is not active.

Figure 1-1. Functional Block Diagram

Link Interface

Arbiter

Port State

Transceiver

Receiver

Transmitter

PLL

Set

Transceiver

LPS

SCLK

LREQ

DATA[0:7]

CTRL[0:1]

LNKON

DIRECT

Packet

Processor

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