Acromag 9412/9460 Digital I/O Board


The 9412 board has 32 outputs accessible from the front panel from connectors P3 and P4. The outputs can be configured as four 8-bit ports or two 16-bit ports.

The 9460 board has 64 inputs or output points accessible from the front panel from connectors P1, P2, P3 and P4. The outputs can be configured as eight 8-bit ports or four 16-bit ports.

The purpose of these boards is to pass a 16-bit event tag from the trigger VME crate to the Silicon VME crate TOF Fastbus crate.

Installation

The jumper positions are:

J6 - IN (only for 9412)
J10 - IN (only for 9412)
J17 - Set Base Address for short (A16) memory map. For the 9412, we set it to 0x0400 i.e pins 1-2 IN, all others OUT. For the 9460, we set it to 0x0800 i.e pins 3-4 IN, all others OUT. J18 - Set Base Address for standard (A24) memory map. Not applicable for our use.
J19 - VME Bus Address Modifier codes. We use short (A16) supervisory/non-privileged access (AM codes 0x29 and 0x29). So pins 1-2 are IN, 3-4 are OUT.

Note: Board asserts SYSFAIL upon power-up. This is due to jumper J20 which is factory-installed.

Memory Map

On the MVME16X boards, the VME A16 address space is accessible locally at 0xffff0000.

On the MVME2X PPC boards, the VME A16 address space is accessible locally at 0xfbff0000.

With the Acromag 9412 base address set at 0x0400, the memory map in terms of an offset from the base is:

0x01 - 0x3F (odd addresses): Module ID PROM (Read-only)

0x81: Status/Control Register (Read-write)

0x100 - 0x103: Output Ports 0-3 (write only) for 9412
0x100 - 0x107: Output Ports 0-7 (read-write) for 9460


The contact person at ACROMAG for technical help with the board is:

Louis A. Brugman, Applications Engineer
248-624-1541 ext. 243 phone
248-624-9234 fax
LBrugman@acromag.com

and at the distributor (J&L Computer Sales) is Dave Garvey: (860)491-3585.


Ashutosh Sanzgiri