GE IS200JGNDG1A GROUND TERMINATION CARD

Description

GE General Electric Technical Specifications: IS200JGNDG1A

The level of access to the IS200JGNDG1A SASI is determined by the state of.

the U/S bit in the CSR register. When the U/S bit is ‘0’, only

the supervisor may access the SASI. When the U/S bit is

‘1 ” both the user and supervisor may access the SASI.

When both the user and supervisor are allowed access, the

mode of the DMA operation is the IS200JGNDG1A same as the mode of the

master that programmed the SASI to do the DMA operation.

That is, if the SASI is programmed in the user mode to do a

DMA transfer, then the address modifier code used for the

DMA transfer will be a user code. If the SASI is programmed

in the supervisor mode, the address modifier codes for the

DMA will be a supervisory code.

The SASI provides a diagnostic test mode which allows the

SASI to test the SASI IS200JGNDG1A interface and perform DMA

operations without a controller connected. The test mode

should be used only when the controller is disconnected.

When the TEST ENABLE bit in the CSR is set high, the test

mode is selected and the SASI signals are controlled as

follows:

REQ* -‘

BSY*-

1/0-

C/O –

MSG* –

RESET* –

ACK* is connected to REQ*

SEL* and TBSY are logically or’ed and inverted

and then connected to BSY*

R/W is connected to I/O

TC/D is inverted and then connected to C/O

TMSG is inverted and then connected to MSG*

RESET* is controlled normally through the CSR

register. The RESEP signal itself is read through

the DMA STATUS register.

.

When the TEST ENABLE bit is selected, a DMA read or write

transfer may be performed by setting the SASI signals to the

proper state and then IS200JGNDG1A enabling the DMA. Since the SASI

data bus is not connected to anything, all ‘O’s will be written

into write DMA’s. During read DMA’s, the data at the SASI

bus ry during is’ going out and cannot be checked.

This test mode allows the user to verify most of the DMA

master logic used during an actual DMA operation.

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