CME8000-DB C-Max, CME8000-DB Datasheet - Page 13

• Manufacturer Part Number: CME8000-DB
• Description: BOARD DEMO FOR CME8000
• Manufacturer: C-Max

Specifications of CME8000-DB

• Module/board Type: Demonstration Board
• For Use With/related Products: CME8000
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 561-1006

C-MAX
Behaviour of the Hardware Logic
DCF77 Signal: at minimum 1µV input voltage all 60 bit of the signal are decoded without
failure and the frame marker (no modulation at bit 60) is recognized also. A pulse of
~200ms is recognized as binary 1 and a pulse of ~100ms is recognized as a binary 0.
After the reception of a complete string, including the frame marker, all bit are stored in the
equivalent place in the shift register (bit 1 in cell1, bit 60 in cell 60)
WWVB Signal: at minimum 1µV input voltage all 60 bit of the signal are decoded without
failure and the frame marker and the position markers (800ms) are recognized also. A
pulse of ~500ms is recognized as a binary 1 and a pulse of ~200ms is recognized as a
binary 0. After reception of a complete string, including the frame marker, all bit are stored
in the equivalent place in the shift register (bit 1 in cell1, bit 60 in cell 60).
MSF Signal: at minimum 1µV input voltage all 60 bit of the signal are decoded without
failure and the frame marker (500ms) is recognized also. A pulse of ~200ms is recognized
as a binary 1 and a pulse of ~100ms is recognized as a binary 0. After reception of a
complete string, including the frame marker, all bit are stored in the equivalent place in the
shift register (bit 1 in cell 1, bit 60 in cell 60)
The bits 53 - 58 (parity checks bits) have a special treatment, a pulse of ~300msec is
recognized as a binary 1 and a pulse of ~200msec as a binary 0.
JJY Signal: At minimum 1µV input voltage all 60 bit of the signal are decoded without
failure and the frame marker and the position markers (200ms) are recognized also. A
pulse of ~500ms is recognized as binary 1 and a pulse of ~800ms is recognized as a
binary 0. After reception of a complete string, including the frame marker, all bit are stored
in the equivalent place in the shift register (bit 1 in cell 1, bit 60 in cell 60).
Every unused bit will be stored with the same condition as the normal bits of this protocol
(e.g. for MSF ~100msec is stored as a binary 0, and a ~200msec pulse as binary 1)
Unused bits are listed as follows:
MSF:
WWVB:
JJY:
DCF:
Storage of Position Markers and Frame start Bits
These bits will be stored as a 1, if the pulse is about the expected length ( WWVB
800msec), otherwise a binary 0 is stored.
List of position markers, and frame start bits:
WWVB, JJY: 0, 9, 19, 29, 39, 49, 59
MSF: 0
DCF: 59
CME8000
SPEC No.
Time Solutions
1- 16, 52;
4, 10 ,11, 14, 20 ,21, 24, 34-38, 40-44,54
4, 10, 11, 14, 20, 21, 24, 34, 35, 53-58
no special treatment for unused bits
Revision
B.15
09.03.07
State
03.05.2007
C-MAX printed
English
Data Sheet
Version
CME8000
13 of 22
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