If it does not, the gap between header blocks may be 3 seconds, to get back into sync. If it is on, every 4 bytes of data in the memory have a 1-byte ECC added. This does not affect the data formats, only the memory capacity. The JET-X packet boundaries will normally be aligned with the telemetry block boundaries. In addition to the above, the general format is presented as a sequence of bytes with an 8 bit mask indicating which bits are valid and invalid for each parameter in question.
All bits are valid.
Bits 11-0 are valid. B.2 XRT data record format B.2.1 Introduction Prior to final formatting, the raw input stream to the DMA buffers is processed by the telescope processors into a stream of CCD events, each marked with an event type. The last pixel of the event is the pixel with the highest y value, and the highest x value for that y. The data in each XRT science data record consists of an integer number of whole CCD events and markers, tightly packed and in strict readout sequence. The interval between the current and previous event.