Motorola MVME712A/D3 User Manual download pdf (Page 211)

NCR 53C710 SCSI I/O Processor (NCR) Tests

MVME167BUG/D3 3-167

SCRIPTs Processor - SCRIPTS

This test initializes the test structures and makes use of the diagnostic registers

for test, as follows:

Verifies that the following registers are initially clear:

Sets SCSI outputs in high impedance state, disables interrupts using the

ÒMIENÓ, and sets NCR device for Single Step Mode.

The address of a simple ÒINTERRUPT instructionÓ SCRIPT is loaded into the

DMA SCRIPTs Pointer register. The SCRIPTs processor is started by hitting

the ÒSTDÓ bit in the DMA Control Register.

Single Step is checked by verifying that ONLY the first instruction executed

and that the correct status bits are set. Single Step Mode is then turned off and

the SCRIPTs processor started again. The ÒINTERRUPT instructionÓ should

then be executed and a check for the correct status bits set is made.

The address of the ÒJUMP instructionÓ SCRIPT is loaded into the DMA

SCRIPTs Pointer register, and the SCRIPTs processor is automatically started.

JUMP Òif TRUEÓ (Compare = True, Compare = False) conditions are checked,

then JUMP Òif FALSEÓ (Compare = True, Compare = False) conditions are

checked.

The ÒMemory Move instructionÓ SCRIPT is built in a script buffer to allow the

ÒSource AddressÓ, ÒDestination AddressÓ, and ÒByte CountÓ to be changed by

use of the ÒconfigÓ command. If a parameter is changed, the only check for

validity is the ÒByte CountÓ during test structures initialization.

The ÒMemory MoveÓ SCRIPT copies the specified number of bytes from the

source address to the destination address.

SIEN SCSI Interrupt Enable

DIEN DMA Interrupt Enable

SSTAT0 SCSI Status Zero

DSTAT DMA Status

ISTAT Interrupt Status

SFBR SCSI First Byte Received

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Motorola MVME712A/D3 User Manual Page 211