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参数资料
| 型号： | CME8000-DB |
| 厂商： | C-Max |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR CME8000 |
| 标准包装： | 1 |
| 系列： | * |
| 模块/板类型： | 演示板 |
| 适用于相关产品： | CME8000 |
| 其它名称： | 561-1006 |
C-MAX Time Solutions
Data Sheet
CME8000
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: 1- 16, 52;
WWVB: 4, 10 ,11, 14, 20 ,21, 24, 34-38, 40-44,54
JJY: 4, 10, 11, 14, 20, 21, 24, 34, 35, 53-58
DCF: no special treatment for unused bits
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
SPEC No.
CME8000
Revision
B.15
State
09.03.07
C-MAX printed
03.05.2007
Version
English
Page
13 of 22
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