Jumpers and Termination

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Factory

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There are eight blocks of jumpers on the RF3570 board.

Three of the blocks should remain factory set. You will need to consider each of the other five blocks to determine whether your application requires changes from the default settings.

The location of the blocks on the board are shown below:

SCSI Configuration

9DOI' •

..., 'II'D

~fClMAt

...

H .J K

us Request/Grant

1 __ ... -

^Sysfail

Exact Burst VMEAddress

Figure 3-1: Locations of Rimfire 3570 Jumpers

Factory-set Jumpers

SCSI Configuration Jumpers

Each of the jumper blocks shown above will be discussed in the following pages.

These jumpers should be left as set by the Ciprico factory.

They are used by the technicians who test the board before shipping; if you change the setting of any of these jumpers the board will not work.

This block of jumpers is used to select power-up defaults for:

Hardware Installation

The jumper block is illustrated below:

2

... ..

I

Figure 3-2: SCSI Configuration Jumper Block The default settings of the jumper block are shown in

Figure 3-2 and Table 3-1.

1-2

3-4 ^Reserved

5-6

OUT OUT OUT 7-8 Enable SCSI Parity Checking OUT = Selected 9-10

11 -12 13-14 15-16

SCSI bus Reset at OUT =Selected

SCSI 10 Bit 2 OUT=O

SCSI 10 Bit 1 OUT=O

SCSI 10 Bit 0 OUT=O

Table 3-1: Default Jumper Settings

Rimfire 3570 User's Guide 3-7

Bus Request/Grant Jumper

This jumper block is used to select the level at which the RF3570 adapter can request and be granted access to the VMEbus by the ARBITER. The four sets of BUS/GNT signals are daisy-chained separately on the VMEbus backplane. Only one of the four levels can be used by a single REQUESTER. The BUS/GNT signals that are not used are passed through to the next board on the

backplane. The BUS/GNT signal will be gated on the adapter for whichever level you choose. If the RF3570 adapter has a request for the bus pending, it will take control of the VMEbus. If it has no request pending it will pass the BUS / GNT signal to the next board. The Bus Request/Grant jumper block is illustrated below.

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Figure 3-3: Bus Request/Grant and Sysfail Jumpers The setting shown in Figure 3-3 is the default from the factory. It indicates level 3 for Bus Grant/Request.

To select a Request/Grant level, place three jumpers down the level you wish to use. The unused levels should have jumpers placed from pin 4 to 5.

Hardware Installation

Bus Request and Grant on Level 0

The VMEbus Sysfail signal is (according to standards) to be asserted during Power-on Self-test to indicate Self-test is occurring. Some systems instead interpret the signal as a failure. For this reason, the RF3570 adapter jumpers the signal on the board.

IN Sysfail signal asserted on bus during Self-test.

OUT Sysfail signal not asserted on bus.

Figure 3-3 on the previous page illustrates the location of the Sysfail Jumper, underneath the Bus Request/Grant Jumpers. As shown, the default for this jumper is IN.

With this jumper you can choose one of two ways for the RF3570 to perform DMA operations:

IN This setting will minimize the number of times that the RF3570 arbitrates for control of the VMEbus. The adapter will not initiate a VMEbus DMA operation until ready to transfer a complete burst of data (based on the bus Throttle Count setting in the General Options command as described in Chapter 6). The RF3570 will initiate a DMA transfer of less than a complete burst of data only when it is finishing a transfer that was not an even multiple of complete bursts.

• •

Rimfire 3570 User's Guide 3-9

VMEbus Address Jumpers

OUT This setting usuq.1ly provides the highest level of performance. In this mode the RF3570 will intitiate a VMEbus DMA operation as soon as it is ready to transfer any data.

Default for this jumper is OUT. Refer to Figure 3-4 for location of this jumper block.

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3-4: Exact Burst and VMEbus Address This set of jumpers is used to select the address at which the RF3570 adapter can be addressed by the system. The jumpers set the upper 7 bits of the 16-bit address, thereby reserving 512 bytes of address space.

Also available to be set is bit 2 of the address modifier lines. With this jumper in you can elect to have the RF3570 adapter reserved for short supervisory access only. If the jumper is out, the board will be in short non-privileged access mode.

The VMEbus Address jumpers are illustrated in Fig. 3-4.

The default address setting of EEOOH, with address modifier of 2DH is shown.

Hardware Installation

For the Address Modifier Jumper:

IN Is equal to Address Modifier 29H.

OUT Is equal to Address Modifier of 2DH.

The VMEbus Address Jumper block pins correspond to the VMEbus address lines as follows:

• •

_A15

• _•

_A14

• • • • • • • •

_{A13 A12}

• • • •

_{All Al0 A9 AM2}

Below is a table of some common RF3570 Base Addresses.

The table demonstrates the settings of the VMEbus Address Jumpers and the VMEbus Address Modifier Jumper for each of the addresses.

Example Addresses

Table 3-2: Example Base Address Jumper Settings

Rimfire 3570 User's Guide 3-11

SCSI bus Termination

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Each end of the SCSI bus cable must be terminated to prevent corruption of the data and control signals. The RF3570 adapter has terminator packs on the board. These are removable in the case that the adapter is not at the end of the SCSI cable.

The adapter provides termination power on the SCSI bus cable. This line is fused on the board. The fuse is

replaceable.

The location of the terminators and removable termination power fuse are shown in the following illustrations. The number of terminators depends on whether the board is single-ended or differential.

Figure 3-5 illustrates a single-ended board.

SCSI Bus Terminators (3)

Pin 1

4 5

1· ... 1· •••••••• a

H ..J K L H

I

^,

_.

Pi ^{N T}

Figure 3-5: Single-ended Board Fuse and Terminators

Hardware Installation

Figure 3-6 illustrates the terminators and fuse on a differential board.

SCSI Bus Terminato

Fuse

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H .J

K L 11

I

^{!!!1 "'1} I Pi ^N

Figure 3-6: Terminators and Fuse on Differential Board

Replacement Fuse

In the event that the termination power fuse is blown, replace it with:

Littlefuse PIN 273-01.5 or equivalent

It is very important to replace the termination fuse with an exact equivalent. If you replace the termination fuse with a value lower or higher, you risk continued problems or damage to the RF3570 and attached equipment.

NOTE:

Rimfire 3570 User's Guide 3-13

Step 3: Board

Im Dokument Rimfire 3570 SCSI (Seite 55-63)