GE IS200RAPAG1BAA BD rack power supply

Description

GE General Electric Technical Specifications: IS200RAPAG1BAA

MDX-SASI-2 is designed to IS200RAPAG1BAA support the operation of

multiple DMA devices in a system. Two signals — BAI (Bus

Acknowledge In) and BAD (Bus Acknowledge Out) —

provide for the connection of a priority DMA daisy chain.

Figure 6 shows their locations on connector J2. As an

example, suppose a system IS200RAPAG1BAA requires the use of four MDX

SASI-2 boards. As shown in Figure 7, the highest priority

board would be DMA device 1, while the lowest priority

board would be DMA device 4. Thus, MDX-SASI-2 boards

are prioritized for multiple DMA operation by their electrical

position in a system, as determined by their J2

interconnections, Typically, twisted pairs (signal + ground)

are used to connect the bus priority chain.

Pin 8 of J2 provides an external request input (/EXT REO),

whereby other STD-Z80 I/O cards without on-board DMA

capability can ‘borrow’ it from MDX~SASI-2. This is done by

feeding a card’s DMA request signal through IEXT REO to

the READY pin of the MK3883 Z80-DMA chip on MDX

SASI-2. IEXT REO can be active low or active high (strap

J4).

IS200RAPAG1BAA module designed to simplify the implementation of serial

communications networks. The board contains a micro

processor and required support hardware, a DMA

controller, and a two port serial communications controller.

The local processor and its support components make up

the Local Intelligence Bus (LIB). The MDX-ISIO will appear

to the STD-ZaO bus as a block of 1/0 mapped registers.

Commands, command parameters, and status information

may be passed between the STD-ZaO bus and the LIB

IS200RAPAG1BAA through these registers. The on-board DMA controller may

be used for transferring data between the serial

communications controller and the local memory in a high

speed communications link (intra-bus transfer), or for

transferring data between the local memory and STD-Zao

system memory (inter-bus transfer).

The architecture of the MDX-ISIO allows the user to

implement any level of control through his firmware and

software. As a minimum, the local processor may be used to

initialize the on-board components and take care of “house

keeping” tasks. At the other extreme, the user might

implement a high level algorithmic controller for the

industrial environment.

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