Symmetricom bc350VXI, User Manual

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CHAPTER ONE
1-6 bc635VME/bc350VXI Time and Frequency Processor (Rev. E) Symmetricom Inc
1.5.1.7 DAYS
When a time source signal is not present at board power up, the board will begin counting at day
000. The TFP can be operated to count days in two modes. For the default Day 000 Invalid
Mode, the TFP will not accept an input day of 000. Table 1 shows the possible combinations of
input source data and current board state on the left side, and the result of the day rollover on the
right side. Note that the table includes such combinations as where the board is set to a non-leap
year, but the source is in a leap year.
Table 1 Day 000 Invalid Mode
Combination
number Board
year Input mode Source
Year Source day Board year Board day Notes
1.1.1 99 Timecode N/A 000 99 Freerun lost track
1.1.2 99 Timecode 99 365 – 001 99 - 00 365 – 001
1.1.3 99 Timecode 00 366 – 001 99 - 00 366 – 001
1.2.1 99 Freerun N/A 365 99 - 00 365 – 001
1.2.2 99 Freerun N/A 366 99 - 00 366 – 001
2.1.1 00 Timecode 00 365 – 366 00 365 – 366
2.1.2 00 Timecode 99 365 – 001 00 365 – 001 1
2.1.3 00 Timecode 00 366 – 001 00 - 01 366 – 001
2.2.1 00 Freerun N/A 365 00 365 – 366
2.2.2 00 Freerun N/A 366 01 366 – 001
Note 1: Day went to 366 for about one second, then went to day 001
For the optional Accept Day 000 Mode, the TFP will accept an input source with an input day of
000. Table 2 shows the possible combinations for this mode.
Table 2 Accept Day 000 Mode
Combination
number Board
year Input mode Input Year Input day Board year Board day Notes
3.1.1 99 Timecode N/A 000 99 000 – 001
3.1.2 99 Timecode 99 364 – 365 99 364 – 365
3.1.3 99 Timecode 99 365 – 001 99 – 00 365 – 001
2
3.1.4 99 Timecode 00 365 – 366 99 – 00 365 – 366 2
3.1.5 99 Timecode 00 366 – 001 99 – 00 366 – 001 2
3.2.1 99 Freerun N/A 000 99 000 – 001
3.2.2 99 Freerun N/A 364 99 364 – 365
3.2.3 99 Freerun N/A 365 99 – 00 365 – 000
3.2.4 99 Freerun N/A 366 99 – 00 366 – 000
4.1.1 00 Timecode N/A 000 – 001 00 000 – 001
4.1.2 00 Timecode 00 365 – 366 00 365 – 366 2
4.1.3 00 Timecode 00 366 – 001 00 – 01 366 – 001 2
4.1.4 00 Timecode 99 365 – 001 00 365 – 001 2
4.2.1 00 Freerun N/A 000 00 000 – 001
4.2.2 00 Freerun N/A 365 00 365 – 366
4.2.3 00 Freerun N/A 366 00 - 01 366 – 367
Note 2: Day went to 000 for about one second, then went to day 001
1.5.2 TIME CODE
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