Texas Instruments TMS320 2833 Series User Manual

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SPRUI07–March 2020
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Boot ROM
Example 2-2. Example 1: Linker Command File to Access IQ Tables
MEMORY
{
PAGE 0 :
...
IQTABLES : origin = 0x3FE000, length = 0x000b50
IQTABLES2 : origin = 0x3FEB50, length = 0x00008c ...
}
SECTIONS
{
...
IQmathTables : load = IQTABLES, type = NOLOAD, PAGE = 0
IQmathTables2 > IQTABLES2, type = NOLOAD, PAGE = 0
{
IQmath.lib<IQNexpTable.obj> (IQmathTablesRam)
}
IQmathTablesRam : load = DRAML1, PAGE = 1
...
}
The following math tables are included in the boot ROM:
• Sine/Cosine table, IQ Math Table
– Table size: 1282 words
– Q format: Q30
– Contents: 32-bit samples for one and a quarter period sine wave
This is useful for accurate sine wave generation and 32-bit FFTs. This can also be used for 16-bit
math; just skip over every second value
• Normalized Inverse Table, IQ Math Table
– Table size: 528 words
– Q format: Q29
– Contents: 32-bit normalized inverse samples plus saturation limits
This table is used as an initial estimate in the Newton-Raphson inverse algorithm. By using a more
accurate estimate the convergence is quicker and hence cycle time is faster.
• Normalized Square Root Table, IQ Math Table
– Table size: 274 words
– Q format: Q30
– Contents: 32-bit normalized inverse square root samples plus saturation
This table is used as an initial estimate in the Newton-Raphson square-root algorithm. By using a more
accurate estimate the convergence is quicker and hence cycle time is faster.
• Normalized Arctan Table, IQ Math Table
– Table size: 452 words
– Q format: Q30
– Contents 32-bit second order coefficients for line of best fit plus normalization table
This table is used as an initial estimate in the Arctan iterative algorithm. By using a more accurate
estimate the convergence is quicker and hence cycle time is faster.
• Rounding and Saturation Table, IQ Math Table
– Table size: 360 words
– Q format: Q30
– Contents: 32-bit rounding and saturation limits for various Q values

Texas Instruments TMS320 2833 Series Specifications

General

Brand	Texas Instruments
Model	TMS320 2833 Series
Category	Controller
Language	English