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16-Bit Timers
Four 16-bit timers are available on the MVME1603/MVME1604. The ISA
bridge controller supplies one 16-bit timer; the Z8536 CIO device provides
the other three. For information on programming these timers, refer to the
data sheets for the S82378ZB ISA bridge controller and the Z8536 CIO
device.
VMEchip2 Timers
Two 32-bit programmable tick timers are available in the optional
VMEchip2 ASIC. Refer to the VMEchip2 description in the
MVME1603/MVME1604 Programmer's Reference Guide for detailed
programming information.
Note
Serial Communications Interface
The MVME1603/MVME1604 uses a Zilog Z85230 ESCC (Enhanced
Serial Communications Controller) to implement the two
synchronous/asynchronous serial communications interfaces, which are
routed through P2 for the MVME1600-001 base board and through the
front panel for the MVME1600-011 base board. The Z85230 supports
synchronous (SDLC/HDLC) and asynchronous protocols. The
MVME1603/MVME1604 hardware supports asynchronous serial baud
rates of 110B/s to 38.4KB/s.
Each interface supports the CTS, DCD, RTS, and DTR control signals as
well as the TxD and RxD transmit/receive data signals, and TxC/RxC
synchronous clock signals. Since not all modem control lines are available
in the Z85230, a Z8536 CIO is used to provide the missing modem lines.
It is advisable to avoid using these timers for system timing
functions, since the VMEchip2 may not be present in all
versions of the MVME1603/MVME1604 module.
Functional Description
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Troubleshooting
