Hardware Preparation
MVME177 Header Notes: (Continued)
3.Header J2 is used to select the power source used to back up the SRAM on the MVME177 when the backup battery is installed.
Do not remove all jumpers from J2. This may
! disable the SRAM.
Caution
If you remove the battery, you must install jumpers on J2 between pins 2 and 4, as shown for Backup Power Disabled.
4.The MVME177 can be the VMEbus system controller. The system controller function is enabled, disabled, or conÞgured for automatic select by jumpers on header J6. If set for AUTO SCON, the MVME177 determines if it is the system controller by its position on the bus. If the MVME177 is in the Þrst slot from the left, it conÞgures itself as the system controller. When the MVME177 is system controller, the SCON LED is turned on. The VMEchip2 may be conÞgured as a system controller when J6 is jumpered as shown.
! | Do not jumper J6 to Auto System Controller. At |
this time, this feature is not functioning | |
Caution | properly. Set up jumpers on J6 only as |
| System Controller or Not System Controller. |
Note | AUTO SCON only works with a |
| backplane. |
5.The thermal sensing pins, THERM1 and THERM2, are connected to an internal thermal resistor and provide information about the average temperature of the processor. Refer to the M68000 Microprocessors UserÕs Manual for additional information on the use of these pins.
6.The FLASH jumper, J8, is used to select the Flash memory and EPROM conÞguration on the MVME177. If the board is conÞgured for 1MB EPROM and 2MB Flash memory, the VMEchip2 GPIO bits can be programmed to select the Þrst or second 2MB of Flash. See Chapter 4 for more information on Flash memory. You can also use the 177Bug SFLASH command to map the Flash memory.
7.Serial port 4 can be conÞgured to use clock signals provided by the RTXC4 and TRXC4 signal lines. Headers J9 and J10 on the MVME177 conÞgure serial port 4 to drive or receive RTXC4 and TRXC4, respectively. Both jumpers should be set the same way. Factory conÞguration is with port 4 set to receive both signals. The remaining conÞguration of the clock lines is accomplished using the Serial Port 4 Clock ConÞguration Select header on the MVME712M transition board. Refer to the MVME712M Transition Module and P2 Adapter Board UserÕs Manual for conÞguration of that header.
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