Motorola MVME172 - Manual (Page 20)

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Board Description and Memory Maps
1
The I/O connection for the 400/500-Series serial ports is provided by two
DB-25 front panel I/O connectors. The I/O is connected to the VMEbus P2
connector. The main board is connected through a P2 transition board and
cables to transition boards. The Series 400/500 MVME172 supports the
transition boards MVME712-12, MVME712-13, MVME712M,
MVME712A, MVME712AM, and MVME712B (referred to in this
manual as MVME712x, unless separately specified). These transition
boards provide configuration headers, serial port drivers and industry
standard connectors for the I/O devices. The MVME712 series transition
boards were designed to support the MVME167 boards, but can be used
on the MVME172 by following some special precautions. (Refer to the
section on the Serial Communications Interface in the MVME172
installation and use manual furnished with your 400/500-Series
MVME172, for more information.)
The VMEbus interface is provided by an ASIC called the VMEchip2. The
VMEchip2 includes two tick timers, a watchdog timer, programmable map
decoders for the master and slave interfaces, and a VMEbus to/from local
bus DMA controller, a VMEbus to/from local bus non-DMA programmed
access interface, a VMEbus interrupter, a VMEbus system controller, a
VMEbus interrupt handler, and a VMEbus requester.
Processor-to-VMEbus transfers can be D8, D16, or D32. VMEchip2 DMA
transfers to the VMEbus, however, can be D16, D32, D16/BLT, D32/BLT,
or D64/MBLT.
The MC2 chip ASIC provides four tick timers, the interface to the LAN
chip, SCSI chip, serial port chip, BBRAM, the programmable interface for
the DRAM and/or SRAM mezzanine board, and Flash write enable.
The IndustryPack Interface Controller (IP2 chip) ASIC provides control
and status information, including DMA control, for up to four single size
IndustryPacks (IPs) or up to two double size IPs that can be plugged into
the MVME172 main module.