CAMAC - 2917
VME Interface to 3922 Controller |
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ABOUT 2917
The Model 2917 interfaces between a VMEbus system and as many as eight CAMAC crates using Model 3922 Parallel Bus Crate Controllers. Connection between the 2917
and the 3922s is made via a Model 5843-Txyz 40-conductor, twisted-pair ribbon cable.
(Order this cable separately.) Balanced RS-485 signaling enhances performance and
provides noise immunity. Data throughput rates for a 16-bit data transfer, using a 5
meter cable between the 2917 and a 3922, result in 920 kbyte/s for CAMAC Double
Buffer Read operations; 890 kbyte/s for CAMAC Write operations can be achieved.
The maximum total signaling distance of the interconnection bus is 90 meters (300
feet). The last 3922 terminates the Parallel Bus with a termination card (provided with
the 3922).
CAMAC operations are executed from a 16-bit 8192 word deep, on-board command
list memory. CAMAC data to and from the VMEbus can be transferred with the 2917
acting as either bus master or slave. All data transfers between the 2917 and the
VMEbus are 16 bits wide. 32-bit addresses are generated by the 2917 during DMA
transfers. Block transfers based on the CAMAC Q-response are supported.
The 2917 can generate an interrupt on the VMEbus when a CAMAC Look-At-Me
(LAM) occurs or when the entire command list has been executed. The request level at
which the interrupt is made is programmable from VMEbus, as is the generated
interrupt vector.
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