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Hardware Preparation and Installation

Optional Jumper Settings

Most of the optional functions on your board can be changed through software control or bit settings in control registers. If your installation requires it, however, you may change jumper settings on the following headers:

Jumper pins 9 through 16 on header J1 are general purpose software readable jumpers open to your application.

Header J2 enables/disables the MVME187 as system controller.

Optional header J6 selects the SRAM backup power source (this is only available as an optional factory build special request).

Headers J7 and J8 select serial port 4 to drive or receive TRXC4 and RTXC4 clock signals.

General Purpose Software Readable Header J1

Each MVME187 may be configured with readable jumpers. They can be read as a register (at $FFF40088) in the VMEchip2 LCSR. The bit values are read as a one when the jumper is off, and as a zero when the jumper is on

Reserved/DeÞned Bits

Jumpers on header J1 affect 187Bug operation as listed in Table 3-2. The factory (default) configuration is with all eight jumpers installed (see Table 3-3).

The MVME187BUG reserves/defines the four lower order bits (GPI3 to GPI0). Table 3-2describes the bits reserved/defined by the debugger:

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Motorola MVME187 manual Optional Jumper Settings, General Purpose Software Readable Header J1