
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)

[Image]

  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

