Reference Manual

PMAC Mini PCI Hardware Reference Manual
22 E-Point Jumper Descriptions
E29 - E33A: Phase Clock Frequency Control
Default and Physical Layout
E29 E30 E31 E32 E33 E33A Phase
Clock
Freq.
E98@1-2
Phase
Clock
Freq.
E98@2-3
E33A E33 E32 E31 E30 E29
ON OFF OFF OFF OFF OFF 2.26 kHz 1.13 kHz
OFF ON OFF OFF OFF OFF 4.52 kHz 2.26 kHz
OFF OFF ON OFF OFF OFF 9.04 kHz 4.52 kHz E31 ON
OFF OFF OFF ON OFF OFF 18.07 kHz 9.04 kHz
OFF OFF OFF OFF ON OFF 36.14 kHz 18.07 kHz
OFF OFF OFF OFF OFF ON 72.28 kHz 36.14 kHz
Jumpers E29 through E33A control the speed of the phase clock, and, indirectly, the servo clock, which is
divided down from the phase clock (see E3 - E6). No more than one of these six jumpers may be on at a time.
E34A - E37: Encoder Sampling Clock Frequency Control
Default and Physical Layout
E34A E34 E35 E36 E37 SCLK Clock Frequency
19.6608 MHz Master
Clock
E34A E34 E35 E36 E37
ON OFF OFF OFF OFF 19.6608 MHz
OFF ON OFF OFF OFF 9.8304 MHz E34 On
OFF OFF ON OFF OFF 4.9152 MHz
OFF OFF OFF ON OFF 2.4576 MHz
OFF OFF OFF OFF ON 1.2288 MHz
Jumpers E34 - E37 control the encoder-sampling clock (SCLK) used by the gate array ICs. No more than one of
these five jumpers may be on at a time.