TMC4330A Datasheet | Document Revision 1.01 • 2017-JAN-12
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9. Ramp Timing and Synchronization
TMC4330A provides various options to initiate a new ramp. By default, every external register
change is assigned immediately to the internal registers via an SPI input. With a proper start
configuration, ramp sequences can be programmed without any intervention in between.
Synchronization
Opportunities
Three levels of ramp start complexity are available. Predefined ramp starts are
available, which are independent of SPI data transfer that are explained in the
subsequent section 9.1. (page 65).
Two optional features can be configured that can either be used individually
or combined, which are as follows:
Shadow
Register Set
A complete shadow motion register set can be loaded into the actual motion registers
in order to start the next ramp with an altered motion profile.
Target Position
Pipeline
Different target positions can be predefined, which are then activated successively.
This pipeline can be configured as cyclic; and/or it can also be utilized to sequence
different parameters.
Masterless
Also, another start state “busy” can be assigned in order to synchronize several motion
controllers for one single start event without a master.
Synchronization
Dedicated Ramp Timing Pins
Pin Names
Type
Remarks
External start input to get a start signal or external start
output to indicate an internal start event.
START
Input and Output
Table 29: Dedicated Ramp Timing Pins
Dedicated Ramp Timing Registers
Register Name
Remarks
Register Address
START_CONF
START_OUT_ADD
START_DELAY
X_PIPE0… 7
0x02
0x11
RW
RW
RW
RW
RW
The configuration register of the synchronization unit.
Additional active output length of external start signal.
Delay time between start triggers and start signal.
Target positions pipeline and/or parameter pipeline.
Shadow register set
0x13
0x38…0x3F
0x40…0x4C
SH_REG0…12
Table 30: Dedicated Ramp Timing Registers
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