RELIANCE 61C345A data acquisition module

The VMEchip2 ASIC provides the local-bus-to-VMEbus interface, the VMEbus-to-local-bus interface, and the DMA controller functions of the local VMEbus. The VMEchip2 also provides the VMEbus system controller functions. Refer to the VMEchip2 description in the MVME172 VME Embedded Controller Programmer’s Reference Guide for detailed programming information. Note that the Abort switch logic in the VMEchip2 is not used. The GPI inputs to the VMEchip2 which are located at $FFF40088 bits 7-0 are not used. The Abort switch interrupt is integrated into the MC2chip ASIC at location $FFF42043. The GPI inputs are integrated into the MC2chip ASIC at location 

Serial Communications Interface 

The MVME172LX uses two Zilog Z85230 serial port controllers to implement the four serial communications interfaces. Each interface supports CTS, DCD, RTS, and DTR control signals, as well as the TXD and RXD transmit/receive data signals. Because the serial clocks are omitted in the MVME172LX implementation, serial communications are strictly asynchronous. The MVME172LX hardware supports serial baud rates of 110b/s to 38.4Kb/s. The Z85230 supplies an interrupt vector during interrupt acknowledge cycles. The vector is modified based upon the interrupt source within the Z85230. Interrupt request levels are programmed via the MC2chip. Refer to the Z85230 data sheet listed in this chapter, and to the MC2chip Programming Model in the MVME172 VME Embedded Controller Programmer’s Reference Guide, for information. The Z85230s are interfaced as DTE (data terminal equipment) with EIA232-D signal levels. The four serial ports are routed to four RJ-45 connectors on the MVME172LX front panel.

IP Interfaces

 Up to two IP modules may be installed on the MVME172LX as an option. The interface between the IPs and MVME172LX is the IndustryPack Interface Controller (IP2) ASIC. Access to the IPs is provided by two 3M connectors located behind the MVME172LX front panel. Refer to the chapter on the IP2 in the MVME172 VME Embedded Controller Programmer’s Reference Guide for detailed features of the IP interface.The MVME172LX provides onboard I/O for many system applications. The I/O functions include serial ports and optional interfaces for IP modules, LAN Ethernet transceivers, and SCSI mass storage devices.

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