It is a VME bus expander master board which can be used in combination with the Advme 1525 board (slave 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.
It functions as an interrupter when an interrupt request is received from a VME slot expanded via an Advme1525 board and it issues an interrupt request to the VME bus on the master side.
It supports bus cycles for 16-bit data buses and 24-bit address buses, and it 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 are possible, allowing 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.
Multiple Configurations
Multiple Advme1524 boards can be inserted in the VME racks on the master side, allowing a further expansion of the number of slots.

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 DC

Maximum Number of Boards Connectable:

• Up to 16 Advme1525 boards can be connected to one Advme1524 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:

• 130 Ohms

Bus Floating:

• Built-in pull-up and pull-down resistance towards negotiation
• Negotiation and floating support
• After drive is complete, bus is driven towards negotiation and then floated

Power-down Process:

• Notification of Advme1524 power up/down to all Advme1525 boards

Synchronous Clock Settings:

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

Bus Interface:

• 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 20.02 mm (0.79”)
• Weight: 270g