PMAC-Lite Hardware Reference
14
E-Point
Descriptions
E29 - E33: Phase Clock Frequency Control
Jumpers E29 through E33 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 1 of these 5 jumpers may be on at a time.
PHASE Clock Frequency
E29 E30 E31 E32 E33
E98 Connects
Pins 1 and 2
E98 Connects
Pins 2 And 3
Default &
Physical Layout
LOC
ON OFF OFF OFF OFF 2.26
kHz
1.13
kHz
E29
E2
OFF ON OFF OFF OFF 4.52
kHz
2.26
kHz
E30
E2
OFF
OFF
ON
OFF
OFF
9.04 kHz
4.52 kHz
E31
E2
OFF
OFF
OFF
ON
OFF
18.07 kHz
9.04 kHz
E32
D2
OFF OFF OFF OFF ON 36.14
kHz 18.07
kHz
E33
D2
Note:
If E40-E43 are not all ON, the phase clock is received from an external source through the J4
serial-port connector, and the settings of E29 – E33 are not relevant.
E34 - E38: Encoder Sampling Clock Frequency Control
Jumpers E34 - E38 control the encoder sampling clock (SCLK) used by the gate array ICs. No more than
1 of these 6 jumpers may be on at a time.
SCLK Clock
Frequency
Default & Physical Layout
E34A
E34 E35
E36
E37
E38
E34A E34 E35 E36 E37 E38
Location; all at D/E3
ON OFF OFF OFF OFF OFF
19.6608
MHz
OFF ON OFF OFF OFF OFF
9.8304
MHz
E34
ON
OFF OFF ON OFF OFF OFF
4.9152
MHz
OFF OFF OFF ON OFF OFF
2.4576
MHz
OFF OFF OFF OFF ON OFF
1.2288
MHz
OFF
OFF
OFF
OFF
OFF
ON
External Clock 1 to 30
MHz maximum input
on CHC4 & CHC4/
E39: Reset-From-Bus Enable
E-Point & Physical
Layout
Location Description
Default
E39
C3
Jump pin 1 to 2 to allow PMAC to
derive its reset from the PC backplane.
Remove jumper to allow PMAC to
power up in normal way; PCbus
hardware reset will not reset PMAC; it
must be removed for standalone
operation.
Only one of E39, E93, and E94 should
be on at once. See also E93 & E94
No jumper
E40 - E43: Servo and Phase Clock Direction Control
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