Cv 67-94 loadable speed table – SoundTraxx DSD-150/DSX Technical Reference User Manual
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44
Digital Sound Decoder Technical Reference
CV 67-94
LOADABLE SPEED
TABLE
Description
The loadable speed table is made up of 28 CVs. Each CV contains a value, n, between 0 and 255
that specifies the percentage of the maximum throttle voltage interpreted as n/255 that is to be
applied to the motor when the speed step in use corresponds to that CV.
bit 7
bit 0
D7
D6
D5
D4
D3
D2
D1
D0
D0-D7:
Speed Table Data
The loadable speed table may be used in the 14, 28 and 128 speed step modes. When 14 speed
step mode is in effect, the DSD will use a curve defined by every other speed table value starting
with speed step 1.
When 28 step mode is enabled, the DSD will simply use one table value for each speed step.
When 128 step mode is enabled, the DSD will interpolate 4-5 points between each speed table
entry to build a 128 point curve.
Note that the DSD will not use the loadable speed table until bit 5 in
both
CV 25 and CV 29 are set
to 1.
Default values: The default values provide a linear (straight line) response. Individual CVs are
loaded as follows:
CV 67
(Speed Step 1):
0 (0x00)
CV 68
(Speed Step 2):
9 (0x09)
CV 69
(Speed Step 3):
18 (0x12)
CV 70
(Speed Step 4):
28 (0x1C)
CV 71
(Speed Step 5):
37 (0x25)
CV 72
(Speed Step 6):
47 (0x2F)
CV 73
(Speed Step 7):
56 (0x38)
CV 74
(Speed Step 8):
66 (0x42)
CV 75
(Speed Step 9):
75 (0x4B)
CV 76
(Speed Step 10):
85 (0x55)
CV 77
(Speed Step 11):
94 (0x5E)
CV 78
(Speed Step 12):
103 (0x67)
CV 79
(Speed Step 13):
113 (0x71)
CV 80
(Speed Step 14):
122 (0x7A)
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