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Note 1. "Busy" signal indicates that stack processing is in progress, with Camac operations
not being completed. "Busy" is asserted when event readout is triggered and deasserted as
soon as Camac operations are completed.
Note 2. "Acquire" idicates that the data acquisition mode is active.
Note 3. "USB Trigger" is generated in response to writing to bit 1 of Action Register.
Note 4. "Event Trigger" indicates that event readout has been triggered.
Note 5. Invert bit causes the signal to be inverted
Note 6. Latch bit causes the signal to be latched. To release the latch one must toggle the bit.
3.1.6 LAM Mask Register
The LAM Mask Register is a 24-bit register that stores the LAM Mask defining what
combination of LAM's triggers event readout during the data acquisition. When zero, the
readout is triggered by a signal applied to the NIM input.
3.1.7 Action Register
Bit 0 of the Action Register activates data acquisition in list mode, when event readout is
triggered either by a start signal applied to the User NIM input I1 or a combination of LAMs
coinciding with the LAM mask.
Writing "1" to Bit 1 of the Action Register generates an internal signal of 150ns duration,
called USB Trigger. The bit is, in actuality, never set, i.e., requires no resetting. This signal
can be routed to user NIM output O1 or O3 and/or displayed on user Red or Yellow LED.
Bit 2 of the Action Register clears a number of internal registers and is intended for primarily
for use during firmware debugging.
3.1.8 Serial Number Register
The Serial Number Register is a Read-Only register containing the serial number of the CC-
USB. The serial number can be also obtained during the initialization of the USB port, e.g.,
by calling the libxxusb library function xxusb_devices_find.
3.2 CAMAC Command Stacks
3.3 CAMAC NAF Generator
3.4 USB In FIFO
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