Motorola MVME187 manual Optional SRAM Backup Power Source Select Header J6

Preparing the Hardware

Optional SRAM Backup Power Source Select Header J6

Header J6 is an optional header used to select the SRAM backup power source on the MVME187, if the optional battery is present. (The battery backup for SRAM is optionally available, but only as a factory build and only by special request.)

If your system is equipped with the optional battery

! backup, do not remove the jumpers from J6. This will

Caution disable the SRAM. If your board contains optional header J6, but the optional battery is removed, jumpers must be installed between pins 1 and 3 and pins 2 and 4 for the factory configuration as shown in Table 3-5.

Serial Port 4 Clock Configuration Select Headers J7 and J8

Serial port 4 can be configured to use clock signals provided by the TRXC4 and RTXC4 signal lines.

Headers J7 and J8 on the MVME187 configure serial port 4 to drive or receive TRXC4 and RTXC4, respectively (see Table 3-6).

❏Factory configuration sets port 4 to receive both signals.

❏The alternative configuration sets port 4 to drive both signals

The remaining configuration of the clock lines is accomplished using the Serial Port 4 Clock Configuration Select header on the MVME712M transition module. Refer to the MVME712M Transition Module and P2 Adapter Board User's Manual for configuration of that header.

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