Technical data

Functional Description
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4
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 EIA-
232-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.