Difference: AMC13UserManual (25 vs. 26)

Monitor Buffer

The AMC13 can store up to 1024 event blocks in SDRAM memory pages (aka buffers) each occupying 512k bytes. The default mode at power-up is that up to 1024 blocks are stored (independent of DAQ outputs), storing stops and the bit STATUS.MONITOR_BUFFER.FULL is set. At any time the number of occupied buffers may be read from STATUS.MONITOR_BUFFER.UNREAD_EVENTS. Note that if any AMC payload is > 32k bytes the event will be segmented and the number of buffers will be greater than the number of events.

One buffer at a time may be read at MONITOR_BUFFER_RAM, which presents a window of up to 512k bytes (0x20000 32-bit words). Advance to the next buffer by writing to ACTION.MONITOR_BUFFER.NEXT_PAGE. Note that one buffer may contain only the first block of a segmented event. Generally a user should call AMC13::readEvent() to obtain the next event including all blocks/buffers as necessary. After reading an event the corresponding buffers are freed and new events may be stored.