B&R 2CP100.60-1 Logic operation module

The MVME177 onboard DRAM is located on a mezzanine board. The mezzanine boards use error checking and correction (ECC) protection to correct single-bit errors and detect double-bit errors. Interrupts or bus exception can be enabled when a bit error is detected. The interrupt output from the memory mezzanine is connected to the VMEchip2 PEIRQ* interrupt input.

❏ Do not disassemble, deform, or apply excessive pressure 

❏ Do not heat or incinerate 

❏ Do not apply solder directly 

❏ Do not use different models, or new and old batteries together 

❏ Do not charge 

❏ Always check proper polarity To remove the battery from the module, carefully pull the battery from the socket.

Two mezzanine boards may be stacked to provide 256MB of onboard RAM. 

The main board and a single mezzanine board together take one slot. The stacked configuration requires two VMEboard slots. The DRAM is four-way interleaved to efficiently support cache burst cycles. The DRAM map decoder can be programmed to accommodate different base address(es) and sizes of mezzanine boards. The onboard DRAM is disabled by a local bus reset and must be programmed before the DRAM can be accessed. Refer to the MCECC in the Single Board Computers Programmer's Reference Guide for detailed programming information. Most DRAM devices require some number of access cycles before the DRAMs are fully operational. Normally this requirement is met by the onboard refresh circuitry and normal DRAM initialization. However, software should insure a minimum of 10 initialization cycles are performed to each bank of RAM.

VMEbus Interface 

The local bus to VMEbus interface, the VMEbus to local bus interface, and the local-VMEbus DMA controller functions on the MVME177 are provided by the VMEchip2. The VMEchip2 can also provide the VMEbus system controller functions. Refer to the VMEchip2 in the Single Board Computers Programmer's Reference Guide for detailed programming information.

Refer to the PCCchip2 in the Single Board Computers Programmer's Reference Guide and to the DS1643/MK48T08 data sheet for detailed programming information.

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