EasyCoder PX4i and PX6i Service Manual 145
Chapter 15 — CPU Board
15.2 Circuits
Components mentioned in this chapter are marked with gray in the draw-
ing below.
Processor (U13)
The processor is a 32-bit RISC offering about 125 MIPS at the internal
clock speed 96MHz. The internal bus speed is twice the external bus speed
at 48MHz. The processor has several features, such as integrated SDRAM
controller, PCI bridge, DMA, UART, timers, etc.
Support Chip (U30)
The PSA (Processor Support ASIC) is a programmable logic device, which
is programmed by the fi rmware at each startup. It contains most of the
printer-specifi c and other logic functions, such as
• Printhead data and strobe control
• Stepper and DC motor logic
• Sensor interface
• Timers and interrupt control
• Control logic for bar code wand and the electronic key/RTC
• I
2
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• Beeper signal generation
• Interface to A/D converter, console, fi nisher, etc.
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