FPGA Register Reference
Last updated
Last updated
Although the user has access to all FGPA registers, only those which provide user-accessible functionality are documented in this manual. Most FPGA registers in the full register map are reserved for Axsun internal purposes. FPGA registers with which a user might interact via the API are listed here:
Register#[bit]
Description
Notes (“0x” prefix indicates a hexadecimal value)
2[2] & 19[15]
Imaging control (Ethernet interface only)
both bits = 1 for Live Imaging
= 0 for Imaging Off
(control PCIe operation via axImagingCntrlPCIe() in AxsunOCTCapture)
2[9, 11]
Image_sync input selection
20[4]
Raw data source selection
= 1 for Test Vector raw data source
= 0 for ADC raw data source
20[5, 13]
Channel select
20[6]
Windowing function load applies to both channels
20[14]
Real/Imaginary select for windowing function load
23[15..0]
Offset
See Offset and Gain
24[15..0]
Gain
See Offset and Gain
25[15..0]
Windowing function
Write 2048 consecutive U16 values representing the windowing function (Real or Imaginary depending on Reg 20 [bit 14]). See Setting the Apodization Window Function
26[15..0]
Test Vector
Write 2048 consecutive U16 values representing the desired test vector. (Enable Reg 20[4] to turn on Test Vector raw data source)
30[15..0]
Pre-FFT Background Subtraction
Write 2048 consecutive I16 values representing the background signature. See Background Subtraction.
31[0]
Burst Record control (Ethernet interface only)
= 1 for Burst Record imaging ON
= 0 for Burst Record OFF
(control PCIe operation via axImagingCntrlPCIe() in AxsunOCTCapture)
33[15..0]
Burst Record # of images (Ethernet interface only)
37[15..0]
Post-FFT Background Subtraction
Write 1024 consecutive U16 values representing the background signature. See Background Subtraction.
60[15..0]
Sub-sampling Factor
The desired Subsampling Factor minus one (M-1). See Raw Data / Bypass Modes and A-line Subsampling
61[15..0]
Bypass Select
Write two consecutive values according to Bypass Modes table