Datasheet

ADAU1701 Data Sheet
Rev. C | Page 38 of 52
2074 TO 2075 (0x081A TO 0x081B)—DATA
CAPTURE REGISTERS
The ADAU1701 data capture feature allows the data at any node
in the signal processing flow to be sent to one of two readable
registers. This feature is useful for monitoring and displaying
information about internal signal levels or compressor/limiter
activity.
For each of the data capture registers, a capture count and a
register select must be set. The capture count is a number
between 0 and 1023 that corresponds to the program step
number where the capture is to occur. The register select field
programs one of four registers in the DSP core that transfers
this information to the data capture register when the program
counter reaches this step.
The captured data is in 5.19, twos complement data format,
which comes from the internal 5.23 data-word with the four
LSBs truncated.
The data that must be written to set up the data capture is a
concatenation of the 10-bit program count index with the 2-bit
register select field. The capture count and register select values
that correspond to the desired point to be monitored in the
signal processing flow can be found in a file output from the
program compiler. The capture registers can be accessed by
reading from Location 2074 and Location 2075. The format for
writing and reading to the data capture registers is shown in
Table 27 and Table 28.
Table 43. Safeload Data Registers Bit Map
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0 0 0 0 PC09 PC08 PC07 PC06 PC05 PC04 PC03 PC02 PC01 PC00 RS01 RS00 0x0000
Table 44.
Bit Name Description
PC[9:0] 10-bit program counter address
RS[1:0] Select the register to be transferred to the data capture output
RS[1:0] Register
00 Multiplier X input (Mult_X_input)
01 Multiplier Y input (Mult_Y_input)
10 Multiplier-accumulator output (MAC_out)
11 Accumulator feedback (Accum_fback)