Revision B
5-13
CPU Theory of Operation: Theory of Operation
MAC 5000 resting ECG analysis system
2000657-002
650 ohms. Presuming negligible driver leakage current, a single enabled
dot would drop 3.9V. While there are mitigating influences (off-pixel
driver leakage current and on-pixel driver saturation voltage) that might
make accurate pixel resistance measurements difficult, it is certainly
possible to differentiate pixels of nominal resistance from those that are
blown open.
SuperIO Peripheral
Controller
A PC standard SuperIO peripheral controller provides floppy drive
support, two serial channels (one IrDA compatible) a clock/calendar
and some miscellaneous parallel port I/O.
Floppy Drive Support
The SuperIO provides support for a 3.5” 1.44MByte IBM format floppy
diskette drive. The FPGA provides DMA like interrupt support for the
floppy controller. A special chip select supplies the DMA acknowledge
signal that gates data to/from the SuperIO floppy controller via the
XBus. To ensure no data is lost, the floppy DMA request is routed to the
StrongARM’s FIQ input.
Four RS-232 Serial Ports (one
dual mode RS-232/IrDA)
Four serial ports are provided on two back panel Mini-DIN 8 pin
connectors. Two serial ports (COM1 and COM2) are provided by the
SuperIO device and two (COM3 and COM4) are provided by the FPGA.
The SuperIO UARTs are full featured 16550 equivalents while the FPGA
ports are minimal implementations with a limited set of bit rates, a
single 8N1 format and no handshake lines. COM3 and COM4 are
remultiplexed onto the COM1 handshake lines (see FPGA section more
COM3/4 details).
Clock/Calendar
The SuperIO device provides a clock/calendar function. Backup battery
power is provided by a "super" capacitor with sufficient storage capacity
to power the clock for hours. This backup source provides more than
sufficient time to exchange battery packs when necessary.
External PS-2 Keyboard Port
External card/bar code readers may be connected to the MAC5000 via a
PS-2 compatible keyboard port. A small amount of 5V power is available
at the connector to power the external device. Power faults are
detectable.
General Purpose Parallel I/O Lines
The SuperIO device provides 16 general purpose parallel I/O lines.
These are used for various control and sensing purposes about the
design.
The Four Stooges
System management and some low level I/O functions are
implemented in preprogrammed 68HC05 microcontrollers. Moving
some I/O functions out into small processors relieves the StrongARM of
burdensome real-time chores and moves the control hardware closer to
the controlled devices, potentially reducing EMI. Localizing control also
promotes reuse in future designs as the functions are self contained and
reasonably portable.
Summary of Contents for MAC 5000
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