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The interval timers use the OSC clock input as their clock source.
The MVME1603/MVME1604 module drives the OSC pin with a
14.31818 MHz clock source.
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.
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
3-15
3
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