VME to CAMAC System

VME is the modern, industry conform bus standard (ISO, IEEE) dominating physics experiment control and read-out systems. Using the VMECAMAC system it is possible to link "existing" CAMAC electronics into the VME world. Direct memory mapping guarantees maximum date transfer performance. The WIENER VMECAMAC system consists of the CC32 CAMAC crate controller and the VC32/VMEADA interface card. Both units are connected via a 32-bit parallel cable (SCSI2-type). Despite being a "one-to-one connection" up to 20 CAMAC crates can be controlled from a single VME crates using multiple VC32/VMEADA modules in it.

Performance: Due to the asynchronous nature of the VME bus protocol the maximum data throughput depends on the performance of the used VME master as well of the slave response time. The presented table states typical access times (DS0 to DTACK) achieved by the VMEADA.

CC32 CAMAC controller

• Two unit wide CAMAC crate controller
• 32-bit wide computer interface
• 16 and 24 (32) bit data transfer supported
• 24-bit programmable LAM mask register
• 2 interrupts for LAM and time-out 
• Programmable S1 strobe time tuning for each station
• LED display for +6V, CAMAC or local access, Inhibit and LAM
• Build In CAMAC dataway display (N, F, A, R / W Data, Q, X, C, Z)
• Implemented test functions for LAM, Q and X response
• FAST CAMAC LEVEL 1 support (up to 5MB/s in dual word, auto-read)
• Performance for individual NAF read & write operations (DSO to DTACK):

  Access type (32 bit)	READ	WRITE
  VME to CC32 internal	500 ns	600 ns
  VME to CAMAC RW24	500 ns	1050 ns
  VME to CAMAC FCL1 R24	-	600 ns
  VME to CAMAC+ Auto Read R24 (D32)	-	125 ns

VMEADA Interface CC32

• VME interface for CAMAC crates equipped with CC32 controller
• 6U VME slave module, A24 D8/D16/D32
• block read (auto-read function)
• selectable base address and interrupt / interrupt vector (jumpers), ROAK and RORA mode
• 32kB memory area for addressing / direct data mapping to CC32 and CAMAC dataway
• differential bus driver and receiver
• available software, C libraries, test and demonstration program