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201

EXOS

201

NIC Type

Ethernet

Transfer Rate

10Mbps

Data Bus

Multibus

Topology

Linear bus

Wiring Type

AUI transceiver via DB-15 on sub-connector

Boot ROM

Available (in firmware)

FACTORY CONFIGURED

Jumper

Setting

J2

Closed

J3

Open

J9

Open

J10

Closed

J12

Open

J61

Closed

ONBARD BUFFER RAM

Size

J4

J7

128KB

Open

Open

256KB

Open

Closed

512KB

Closed

Open

CARRIER SENSE CONFIGURATION

Setting

J5

Carrier sense enabled

Open

 

Carrier sense disabled

Closed

Note:Carrier sense should be disabled when using a broad-band transceiver.

BOOT ROM

Setting

J6

Enabled

Closed

Disabled

Open

SIGNAL QUALITY CONFIGURATION

Setting

J11

Signal quality check enabled

Closed

 

Signal quality check disabled

Open

Note:Signal quality checking should be disabled in any Ethernet version 1 installation.

MULTIBUS I/O (SLAVE) ACCESS CONFIGURATION

The EXOS 201 supports two simultaneous I/O ports, labeled port A and port B. In addition, the 201 supports either 8-bit or 16-bit memory addressing. When in 16-bit addressing mode, the port A address is selectable via jumper J52 & J53. Jumper J52A-G defines bits 1-7 of the memory address respectively, and J53A-H defines bits 8-15 respectively (when a jumper is closed, the bit that it corresponds to is set to 1; when open, the bit is set to 0.). For expample, if JP52A is closed, and JP52B-G & JP53A-H are open, the memory address selected is 0001h. When in 8-bit addressing mode, JP52A-G select bits 1-7 respectively, and JP53 is inactive. Regardless of the memory addressing mode, port B will always be located 1 byte above port A's address (e.g. Port A = 0001h, Port B = 0002h). Bit 0 is always set to 0 for port A, and 1 for port B. (Open=0, closed=1)

MULTIBUS MEMORY ADDRESSING METHOD

Memory Address

J50

J51

8-bit memory addressing

Open

Closed

16-bit memory addressing

Closed

Open

44-PIN ISBX CONNECTOR CONFIGURATION

The iSBX connector (IEEE P969 specification), is included for daughterboard options. There are two jumper-selectable interrupt lines (J13 and J14) which should be left open unless an optional daugherboard is installed. If a daughterboard is installed, one jumper or the other must be closed, but not both. JP13 closed selects IR0, JP14 selects IR1.

WATCHDOG TIMER CONFIGURATION

Setting

J15

Watchdog timer enabled

Open

Watchdog timer disabled

Closed

MULTIBUS INTERRUPT ACCESS

INT

J54A

J54B

J54C

J54D

J54E

J54F

J54G

J54H

0

Open

Open

Open

Open

Open

Open

Open

Closed

1

Open

Open

Open

Open

Open

Open

Closed

Open

2

Open

Open

Open

Open

Open

Closed

Open

Open

3

Open

Open

Open

Open

Closed

Open

Open

Open

4

Open

Open

Open

Closed

Open

Open

Open

Open

5

Open

Open

Closed

Open

Open

Open

Open

Open

6

Open

Closed

Open

Open

Open

Open

Open

Open

7

Closed

Open

Open

Open

Open

Open

Open

Open

USER PROGRAMMABLE EPROM TYPE

Type

J55

J56

27128

Closed

Open

27256

Open

Closed

None

Open

Open

MULTIBUS PRIORITY RESOLUTION METHOD

Resolution Scheme

J57

Enabled

Closed

 

Disabled

Open

BUS ARBITRATION

Setting

J58

J59

Disabled

Open

Closed

 

Enabled

Closed

Open

CLOCK CONFIGURATION

Setting

J60

/CCLK and /BCLK bus driven

Open

/CCLK and /BCLK card driven

Closed

DIAGNOSTIC LED(S)

LED

Status

Condition

1

On

Performing power on self tests

1

Flashing

Waiting for host or network initialization

1

Off

Card succesfully inserted into network

2

On

Data is being transmitted

2

Off

Data is not being transmitted

3

On

Attempted access to non-existant memory location on multibus

3

Pulsing

Multibus cycle in progress

3

Off

No multibus cycle in progress