Delta Tau GEO MACRO DRIVE User Manual download pdf (Page 172)

Geo MACRO Drive User Manual

160 Geo Macro Drive MI-Variable Reference

MS{node},MI997 Phase Clock Frequency Control

Range: 0 - 15

Units: PHASE Clock Frequency = MaxPhase Frequency / (MI997+1)

Default: 0

PHASE Clock Frequency = 9.0346 kHz / 1 = 9.0346 kHz

(with default value of MI992)

MI997, in conjunction with MI992, determines the frequency of the PHASE clock on a Geo MACRO

Station. Each cycle of the PHASE clock, a set of MACRO ring information is expected, and any data

transfers between MACRO nodes and interface circuitry are performed. The PHASE clock cycle on the

Geo MACRO Station should match that of the PMAC commanding it as closely as possible.

Specifically, MI997 controls how many times the PHASE clock frequency is divided down from the

"maximum phase" clock, whose frequency is set by MI992. The PHASE clock frequency is equal to the

"maximum phase" clock frequency divided by (MI997+1). MI997 has a range of 0 to 15, so the

frequency division can be by a factor of 1 to 16. The equation for MI997 is:

MI997 = (MaxPhase Freq / PHASE Clock Freq) - 1

The ratio of MaxPhase Freq. to PHASE Clock Freq. must be an integer.

Example:

With a 20 kHz MaxPhase Clock frequency established by MI992, and a desired 6.67 kHz PHASE clock

frequency, the ratio between MaxPhase and PHASE is 3:

MI997 = (20 / 6.67) - 1 = 3 -1 = 2

MS{node},MI998 Servo Clock Frequency Control

Range: 0 - 15

Units: Servo Clock Frequency = PHASE Clock Frequency / (MI998+1)

Default: 0

PHASE Clock Frequency = 9.0346 kHz / (0+1) = 9.0346 kHz

(with default values of MI992 and MI997)

Note:

There is currently no software use of the SERVO clock on the Geo MACRO

Station. However, it is needed to capture certain encoder values in the

DSPGATEx Servo ICs.

MI998, in conjunction with MI997 and MI992, determines the frequency of the SERVO clock on the Geo

MACRO Station.

Specifically, MI998 controls how many times the SERVO clock frequency is divided down from the

PHASE clock, whose frequency is set by MI992 and MI997. The SERVO clock frequency is equal to the

PHASE clock frequency divided by (MI998+1). MI998 has a range of 0 to 15, so the frequency division

can be by a factor of 1 to 16. The equation for MI998 is:

MI998 = (PHASE Clock Freq. / SERVO Clock Freq) - 1

The ratio of PHASE Clock Freq. to SERVO Clock Freq. must be an integer. On the 16-Axis MACRO

Station, MI998 should always be set to 0 so the servo clock frequency is equal to the phase clock

frequency.

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Delta Tau GEO MACRO DRIVE User Manual Page 172