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Pentek Model 6526 Operating Manual Page 17

Rev. A

Chapter 2: Installation and Connections

2.1 Inspection

After unpacking, inspect the unit carefully for possible damage to connectors or compo−

nents. If any damage is discovered, contact Pentek at (201) 818−5900. Please save the

original shipping container and packing material in case re−shipment is required.

The Model 6526 contains two printed circuit (PC) assemblies. The board with the VME−

bus P1 and P2 connectors (the VME board, Pentek part # 004.65260) contains the VME

interface, the ‘C31 DSP, its associated memory resources, and the FIFOs. The other board

(the Mezzanine board, Pentek part # 004.65261), houses the input connectors and the

Digital Receiver circuitry. Drawings of the component and solder sides of both PC

assemblies are shown in Figures 2−2 through 2−5, on the next four pages.

2.2 VMEbus A16 Base Address Switches

Three separate address spaces are defined for the VMEbus environment. These three

regions are known as A16, A24, and A32. Each device in your VMEbus card cage must

have a unique address in any address space in which it must be accessible. On the

Model 6526, the A16_base address (the lowest address in the A16 region occupied by

this device) is set by two rotary switches. These switches, SW1 and SW2, are located on

the VME board and are accessible through a notch at the rear of the Mezzanine board.

Set these switches for the desired A16_base address before installing the Model 6526 in

the VMEbus card cage. Figure 2−1, below, shows what these switches look like, and

Figure 2−2, on the next page, shows the location of these switches on the VME board.

The settings of these 16−position rotary switches each defines four bits of the Model

6526’s A16_base address. Each of the 16 positions on the switches denotes a hex digit (0

to F), whose four−bit binary value is used as part of the device’s base address. SW2

defines the four most significant bits (MSBs) of the address (A15 – A12), and SW1

defines the next four bits (A11 – A8). Thus, with 16 settings available on each of two

switches, 256 different base addresses may be selected. Figure 2−1, above, illustrates

the switches set for an A16_base address of 0x8C00.

Figure 2−1: Model 6526 − Rotary Switches

SW2 SW1

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 195 196

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VXI?Corporation F80 Especificaciones Pagina 17