83C795 datasheet(73/136 Pages) SMSC

73 / 136 page

regis ter map shown in Table 6-7 changes when the

adapter is run in I/O-mapped mode (s ee s ection

6.8.6). Als o, when the R OM s pace is dis abled

(when BIO.4 and BIO.5 are both s et), the R OM

configuration regis ters become read-only and

always read zeros .

T here are 22-bits of information in the P nP

configuration regis ters that are us edfor configuring

the 83C795. T hese bits are s hifted from the PnP

s ection to the 83C795 section whenever the chipis

activated. T he s ame bits are s hifted from the

83C795 s ection back to the PnP s ection at the end

of the initial E E R OM load (to get the default values

into the PnP regis ters ). S ome of thes e bits may

have to be remapped before they are s hifted so as

to match the formats of the two different regis ter

Address

Function

Name

READ_DATA PORT ADDRESS

Resource String

Number

Secondary

Address

0 - 7

9 - N

N + 1

N + 2

SERIAL ISOLATION

CONFIGURATION CONTROL

WAKE (CSN)

RESOURCE DATA

STATUS

CARD SELECT NUMBER

(CSN)

LOGICAL DEVICE NUMBER

ACTIVATE

I/O RANGE CHECK

RAM BASE ADDRESS [23-16]

RAM BASE ADDRESS [15-08]

ROM BASE ADDRESS [23-16]

RAM RANGE LENGTH [15-08]

ROM BASE ADDRESS [15-08]

RAM CONTROL

RAM RANGE LENGTH [23-16]

ROM CONTROL

ROM RANGE LENGTH [23-16]

ROM RANGE LENGTH [15-08]

I/O BASE ADDRESS [15-08]

I/O BASE ADDRESS [07-00]

IRQ NUMBER

IRQ TYPE

Serial ID

Checksum

Resource Data

End Tag

Checksum

Item

ADDRESS

WRITE_DATA

READ_DATA

0x0279

0x0A79

0x0200 -

0x03FF

ISA ADDRESS SPACE

EEROM CONTENTS

PNP SECONDARY ADDRESS SPACE

FIGURE 6-8. PLUG AND PLAY CONFIGURATION REGISTERS

83C795

HOST INTERFACE SECTION

83C795 Datasheet(PDF) 73 Page - SMSC Corporation

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