Delta Tau GEO BRICK LV User Manual
Turbo PMAC User Manual
26
Turbo PMAC System Configuration and Auto Configuration
E29 – E33 Phase Clock Frequency Control
The jumper set E29 – E33 determines the phase clock frequency, controlling its division from the DCLK
signal set by E98. Only one jumper in this set may be installed at any time. The maximum possible
phase clock frequency is 1/68 of the DCLK frequency – 36.14 kHz for the 2.46 MHz DCLK, or 18.07
kHz for the 1.23 MHz DCLK. This is the frequency selected by E33. The following table shows the
possible phase-clock frequencies that can be selected:
signal set by E98. Only one jumper in this set may be installed at any time. The maximum possible
phase clock frequency is 1/68 of the DCLK frequency – 36.14 kHz for the 2.46 MHz DCLK, or 18.07
kHz for the 1.23 MHz DCLK. This is the frequency selected by E33. The following table shows the
possible phase-clock frequencies that can be selected:
Jumper Selected
2.46 MHz DCLK (E98 1-2)
1.23 MHz DCLK (E98 2-3)
E33
36.14 kHz
18.07 kHz
E32 18.07
kHz
9.04
kHz
E31 (default)
9.04 kHz
4.52 kHz
E30
4.52 kHz
2.26 kHz
E29
2.26 kHz
1.13 kHz
E3 – E6 Servo Clock Frequency Control
The jumper set E3 – E6 determines the servo clock frequency, controlling its division from the phase
clock signal set by E29 – E33 and E98. These four jumpers create a binary number N specifying that the
phase clock frequency be divided by N+1 to obtain the servo clock frequency. A jumper ON creates a 0-
bit; a jumper OFF creates a 1-bit, with E3 as the least significant bit. The following table shows the
possible settings:
clock signal set by E29 – E33 and E98. These four jumpers create a binary number N specifying that the
phase clock frequency be divided by N+1 to obtain the servo clock frequency. A jumper ON creates a 0-
bit; a jumper OFF creates a 1-bit, with E3 as the least significant bit. The following table shows the
possible settings:
E3 E4 E5 E6 Division
Factor N+1
E3 E4 E5 E6 Division
Factor N+1
ON ON ON ON
1
ON ON ON OFF
9
OFF ON ON ON
2
OFF ON ON OFF
10
ON OFF ON ON
3
ON OFF ON OFF
11
OFF OFF ON ON
4*
OFF OFF ON OFF
12
ON ON OFF ON
5
ON ON OFF OFF
13
OFF ON OFF ON
6
OFF ON OFF OFF
14
ON OFF OFF ON
7
ON OFF OFF OFF
15
OFF OFF OFF ON
8
OFF OFF OFF OFF
16
* Default
Setting Turbo PMAC2 Phase and Servo Clock Frequencies
On a Turbo PMAC2 controller (including UMAC and QMAC systems), the system clock frequencies are
determined by the setting of I-variables for the Servo IC or MACRO IC that has been selected as the
clock source for the system. Selection of this IC (usually the first Servo IC in a system without the
MACRO ring, or the first MACRO IC in a system with the MACRO ring) is covered in the preceding
section, and the factory default selection is usually acceptable.
determined by the setting of I-variables for the Servo IC or MACRO IC that has been selected as the
clock source for the system. Selection of this IC (usually the first Servo IC in a system without the
MACRO ring, or the first MACRO IC in a system with the MACRO ring) is covered in the preceding
section, and the factory default selection is usually acceptable.
When Servo IC m is selected as the clock source, I-variables I7m00, I7m01, and I7m02 control these
system clock frequencies. When MACRO IC 0 is selected as the clock source, as on Ultralite Turbo
PMAC2 boards, I-variables I6800, I6801, and I6802 control these system clock frequencies.
system clock frequencies. When MACRO IC 0 is selected as the clock source, as on Ultralite Turbo
PMAC2 boards, I-variables I6800, I6801, and I6802 control these system clock frequencies.