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CORDIC co-processor (CORDIC) RM0440

484/2126 RM0440 Rev 4

Bits 31:0 ARG[31:0]: Function input arguments

This register is programmed with the input arguments for the function selected in the

CORDIC_CSR register FUNC field.

If 32-bit format is selected (CORDIC_CSR.ARGSIZE = 0) and two input arguments are

required (CORDIC_CSR.NARGS = 1), two successive writes are required to this register.

The first writes the primary argument (ARG1), the second writes the secondary argument

(ARG2).

If 32-bit format is selected and only one input argument is required (NARGS = 0), only one

write is required to this register, containing the primary argument (ARG1).

If 16-bit format is selected (CORDIC_CSR.ARGSIZE = 1), one write to this register contains

both arguments. The primary argument (ARG1) is in the lower half, ARG[15:0], and the

secondary argument (ARG2) is in the upper half, ARG[31:16]. In this case, NARGS must be

set to 0.

Refer to Section 17.3.2 for the arguments required by each function, and their permitted

range.

When the required number of arguments has been written, the CORDIC evaluates the

function designated by CORDIC_CSR.FUNC using the supplied input arguments, provided

any previous calculation has completed. If a calculation is ongoing, the ARG1 and ARG 2

values are held pending until the calculation is completed and the results read. During this

time, a write to the register cancels the pending operation and overwrite the argument data.

ST STM32G491 User Manual

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