It is a VME bus expander slave board can be used in combination with the Advme 1524 board (master board) to expand the number of VME bus slots.
It bridges the read/write cycle and interrupt acknowledge cycle of the VME bus on the master side to the VME bus on the slave side.
There is a bus arbiter function and a bus master function, so there is no need for a CPU board or similar component on the slave side.
It supports bus cycles for 16-bit data buses and 24-bit address buses, and is ideal when there is the need to expand the number of slots in a system that uses a large number of DI, DO, AI, AO and other I/O boards.
It can be used to expand the number of VME bus slots.
Daisy-chain connections
Daisy-chain connections can be created and this allows I/O boards to be distributed to multiple VME racks.
Daisy-chain connections allow overall cable length to be extended to 30m, and up to 16 slave boards can be connected to one master board.
Inserting an I/O board with an interrupter function into the slot on the slave side enables the execution of an interrupt process with the CPU board on the master side.
A setting can be specified so that only interrupt requests of a certain level are sent to the master board.

Architecture:

• VME compliant

Signal System:

• RS-485 multidrop
• interrupt request line only RS-485 point-to-point daisy chain

Transmission Method:

• Parallel, Multiplex, Source synchronous forwarding

Input Voltage:

• Up to 7V

Maximum Number of Boards Connectable:

• Up to 16 Advme1525 boards can be connected to one Advnme1524 board

Maximum Overall Cable Length:

• Up to 30m

Number of Actual Signals:

• 39 pairs

Connector:

• 80-pin half-pitch connector

Cable:

• Two 20 pair flat-ribbon type twisted cables

Termination:

• 130Ohms (only required for last slave board)
• Terminator board available in daughter board format (Advme1524-TERM)

Power-down Process:

• Power up/down information received from Advme1524 board to control receiver

Synchronous Clock Settings:

• 125ns, 250ns, 500ns or 1µs selectable by jumper pin

Bus:

• VME bus
• Width complies with A24/A16 D16/D08 (EO) Rev.C.3

RoHS:

• Lead-free

Power Supply:

• Single +5V DC

Mechanical:

• Dimensions: 6U – 262 x 160 mm (10.31” x 6.30”)
• Pitch: Single slot – 20.02mm (0.79”)
• Weight: 270g