Summary of Contents for Safran CDM-7
- Page 1 ELECTRONICS & DEFENSE CDM-7 User Manual CDM-7 User Manual Page 1 of 12 Revision: 1 16 April 2025...
- Page 2 CDM-7 User Manual, Rev 1 1. Introduction The CDM-7 clock distribution and timing reference module is a PCIe card that provides 10MHz and 1PPS signals for up to seven devices that need precise synchronization. The CDM-7 is ideal for PCIe-based Software-Defined Radios (SDR) installed in rack-mounted or desktop PCs, and can also be used for any other application that requires a precise timing reference.
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Page 3: Specifications
CDM-7 User Manual, Rev 1 2. Specifications 2.1. Timing 2.1.1. Internal Oscillator Disciplined on-board clock Accuracy to UTC (locked to GNSS @ 1 sigma): 325 ns Holdover (constant temp after 2 weeks GNSS lock): After 4 hours: 1 μs After 24 hours: 25 μs 2.1.2. -
Page 4: Operating Modes
PCIe: Full-height mounting bracket provided; bus interface: low-profile PCIe x1, Rev 1.1 2.4.3. Safety & EMI Certifications: RoHS, CE, FCC Class A 3. Operating Modes The 6 total operating modes within the CDM-7 can be changed using API commands (see next section). The 6 modes are: TRIGGER MODE TRIG_IN... -
Page 5: Api Commands
4.1. API Basics Note: The CDM-7 API is based on the TSync API calls. Some commands currently have responses that may need to be reinterpreted using this guide. The CDM-7 API supports multiple devices. Most commands begin with the <device index>... - Page 6 CDM-7 User Manual, Rev 1 RS_GetEntry 0 0 | Pri | Time | 1PPS ------------------------------ DIS | 1 | gps0 | gps0 4.2.3. Enable the first reference (gps0): RS_SetEnable Usage: RS_SetEnable <device index> <index> <enable> Valid values for <enable>: •...
- Page 7 CDM-7 User Manual, Rev 1 GR (0) Survey Progress: 51% 4.2.7. Get current oscillator stats: XO_GetState Usage: XO_GetState <device index> Example output: XO_GetState 0 XO State: 4 The numbers received at output correspond to the following states: warm up 2. calibration 3.
- Page 8 CDM-7 User Manual, Rev 1 LS_GetMessage 0 Log: 2000 002 21:35:49 000 CDM Mode set to A (0) for instance 0 4.3.2. Read the current offset IR_GetOffset Usage: IR_GetOffset <device index> <index> Example output: IR_GetOffset 0 0 IR (0) Offset: 12855...
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Page 9: Calibration Procedure
CDM-7 User Manual, Rev 1 Using LS_GetMessage to read the CDM7 log would show: LS_GetMessage 0 Log: 2000 002 21:31:51 000 CDM Status : Mode-F PPS out+in 10 MHZ out+in+ 5. Calibration Procedure If this unit is field installed, it is recommended to perform this calibration procedure to properly align all features and systems. - Page 10 CDM-7 User Manual, Rev 1 GR (0) Survey Progress: 100% f) Wait for GNSS reference to become valid (indicated by Time and 1PPS both returning 1). Example command and expected result: GR_GetValidity 0 0 GR (0) Reference Validity: Time: 1 1PPS: 1 2) Enable oscillator calibration.
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Page 11: Upgrade Procedure
CDM-7 User Manual, Rev 1 6. Upgrade Procedure Safran will occasionally issue upgrades to your device as needed. To install upgrades. you will need to use the US_Upgrade command. Safran will provide 2 files for upgrade purposes: a) rt_fw.bin b) rt_fpga.bin These files will need to be uploaded to your Linux system before upgrade. - Page 12 Information furnished by Safran is believed to be accurate and reliable. However, no responsibility is assumed by Safran for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Safran reserves the right to make changes without further notice to any products herein.
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