dCS 904 User Manual

Manual for Software Version 1.5x and 1.36

dCS Ltd

June 2000

 

 

Check Master Clock has changed frequency. If it has not go back to step 5.

Transmit -> [1][REQUEST_FS], request actual frequency Responds -> [ACK immediate][1], actual frequency

The system is now set up with the Master Clock configured for 96k operation and the ADCs and DACs locked in PCM mode to 96k.

Example: Switching to P3D

Change the Master Clock frequency to 44.1k prior to changing the ADC and DAC operating mode to DSD. Change the DAC operating mode prior to the ADC. When changing the Master Clock frequency the system should be allowed to settle to the new frequency before any further RS-232 activity.

6)Command Master Clock to change frequency. Allow the system time to settle after this command with no RS-232 activity, three seconds should be sufficient.

Transmit -> [1][SEL_FS], change to 44.1k Responds -> [ACK 3 seconds][1], requested frequency Wait for 3 seconds

7)Check Master Clock has changed frequency. If it has not go back to step 6.

Transmit -> [1][REQUEST_FS], request actual frequency Responds -> [ACK immediate][1], actual frequency

8)Command DACs 6, 7, 8 and 9 to change mode, the units may take up to 15 seconds to complete this command (if the previous mode had been PCM the FPGAs need to be re-loaded, which takes time). There is also no need to wait prior to moving on to step 9.

Transmit -> [6][DSD_MODE], to change mode to P3D of unit 6 Responds -> [ACK 15 seconds][6], requested mode Transmit -> [7][DSD_MODE], to change mode to P3D of unit 7 Responds -> [ACK 15 seconds][7], requested mode Transmit -> [8][DSD_MODE], to change mode to P3D of unit 8 Responds -> [ACK 15 seconds][8], requested mode Transmit -> [9][DSD_MODE], to change mode to P3D of unit 9 Responds -> [ACK 15 seconds][9], requested mode

9)Command ADCs 2, 3, 4 and 5 to change mode, the units may take up to 15 seconds to complete this command (if the previous mode had been DSD the FPGAs need to be re-loaded, which takes time). There is also no need to wait prior to moving on to step 10.

Transmit -> [2][DSD_MODE], to change mode to P3D of unit 2 Responds -> [ACK 15 seconds][2], requested mode Transmit -> [3][DSD_MODE], to change mode to P3D of unit 3 Responds -> [ACK 15 seconds][3], requested mode Transmit -> [4][DSD_MODE], to change mode to P3D of unit 4 Responds -> [ACK 15 seconds][4], requested mode Transmit -> [5][DSD_MODE], to change mode to P3D of unit 5 Responds -> [ACK 15 seconds][5], requested mode

Manual part no: DOC135904 iss 2B2

Page 58

135904ma2b2.pdf file available from website

Contact dCS on + 44 1799 531 999

email to: more@dcsltd.co.uk

(inside the UK replace + 44 with 0)

web site: www.dcsltd.co.uk