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lbaops:expres:mark5bformat [2007/01/31 11:48]
chris.phillips
lbaops:expres:mark5bformat [2015/12/18 16:38] (current)
Line 1: Line 1:
-=====  Mark5B disk data format\\\\ ===== +=====  Mark5B disk data format ===== 
-\\\\ + 
-Taken from Mark5B System User's Manual (9 June 2006) Section 5.\\\\ +Taken from Mark5B System User's Manual (9 June 2006) Section 5. 
-\\\\ + 
-Data on disk is divided into equal-length disk frames (DF). Each DF has a header of 4 32-bit words followed by 2500 32-bit words of data (10000 bytes). The DF boundary is aligned with the UT second tick.\\\\ +Data on disk is divided into equal-length disk frames (DF). Each DF has a header of 4 32-bit words followed by 2500 32-bit words of data (10000 bytes). The DF boundary is aligned with the UT second tick. 
-\\\\ + 
-==== Disk Frame Header\\\\ ==== +==== Disk Frame Header ==== 
-\\\\ + 
-World 0  |Synchronization word //(WHAT IS IT??)// |\\ +Word 0  |Synchronization word (//0xABADDEED//
-World 1  |Bits 31-16: User specifed |\\\ +Word 1  |Bits 31-16: User specifed | 
-|          |Bit 15: T - tvg data |\\ +|          |Bit 15: T - tvg data (test data if set)
-|          |Bits 14-0: DF # within second |\\\\ +|          |Bits 14-0: DF # within second | 
-| Word 2-3 |VLBA BCD Time code and 16 bit CRC |\\\\ +| Word 2-3 |VLBA BCD Time code and 16 bit CRC | 
-\\\\+ 
 + 
 + 
 +| Sync word (32 bit) ||| 
 +| User-specifed (16 bits) | T | Frame# within second (starting at 0) | 
 +| VLBA BCD Time code word 1 ('​JJJSSSSS'​) ||| 
 +| VLBA BCD Time code word 2 (16 bit) ('​.SSSS'​) | CRC 16 bit || 
 + 
 +==== Disk Data Format ==== 
 + 
 +Raw VLBI data is packed within a 32 bit word, with the earliest time sample corresponding to the least significant bits .
  
-\\\\ 
-| Sync word |||\\ 
-| User-specifed (16 bits) | T | Frame# within second (starting at 0) |\\\\ 
-| VLBA BCD Time code word 1 ('​JJJSSSSS'​) |||\\\\ 
-| VLBA BCD Time code word 2 (16 bit) | CRC 16 bit ||\ 
  
  
lbaops/expres/mark5bformat.1170204522.txt.gz · Last modified: 2015/12/18 16:38 (external edit)