GE VMIVME-5576 REFLECTIVE MEMORY BOARD

Product Overview

-The Reflective Memory concept provides a very fast and efficient way to share data between distributed computer systems.

VMIC's VMIVME-5576 Reflective Memory interface allows data to be shared between up to 256 independent systems (nodes) at rates of up to 6.2 Mbyte/s. Each Reflective Memory board can be configured with up to 256 nodes.

Each Reflective Memory board can be configured with 256 Kbytes to 1 Mbyte of on-board SRAM. local SRAM allows fast reads of stored data.

Write data is stored in the local SRAM and broadcast to other Reflective Memory nodes via a high-speed fiber optic data path.

Data transfers between nodes are software transparent, so there is no I/O overhead.

Transmit and receive FIFOs buffer data during peak data rates to optimize CPU and bus performance and maintain high data throughput.

Reflective memory also allows interrupts to one or more nodes by writing to byte registers.

These interrupt (tertiary, user-definable) signals can be used to synchronize system processes or to follow any previous data.

Interrupts always follow the data to ensure that the data is received before the interrupt is acknowledged.

ANALOG OUTPUTS

Number of Output Channels:

Thirty-Two: One S&H per channel

Full-Scale Analog Output

(Jumper-Selectable):

Unipolar: 0 to +10 V, 0 to +5 V

Bipolar: ±2.5 V, ±5.0 V, ±10.0 V

Analog Output Code: The 12-bit digital-to-analog

converter (DAC) accepts digital codes in straight

binary, offset binary, or two’s complement

Output Load Current: ±10 mA, over the entire

output voltage range of ±10 V

Resolution: 12 bits

Output Impedance: <0.1 Ω, online

>10 MΩ, offline

Total Error: ±0.05 percent of full-scale range

Maximum Settling Time to 1 LSB: 3.4 ms

The VMIVME-5576 does not need to be initialized unless interrupts are used.

If interrupts are used, vectors and interrupt levels must be written to on-board registers and interrupts must be set.

Each node on the system has a unique identification number between 0 and 255.

The node number is determined by placing jumpers on the board during hardware system integration.

The node number can be read by software by accessing the on-board registers. In some applications, the node number helps determine the function of the node.

The PMC-5565PIORC Reflective Memory node card provides a high-speed, low latency, 

deterministic interface that allows data to be shared between up to 256 independent systems (nodes) 

at rates up to 170 Mbyte/s. Each Reflective Memory board may be configured with 128 MB or 256 MB of onboard SDRAM. 

The local SDRAM provides fast Read access times to stored data. 

Writes are stored in local SDRAM and broadcast over a high-speed fiber-optic data path to other Reflective Memory nodes. 

The transfer of data between nodes is software transparent, so no I/O overhead is required. 

Transmit and receive FIFOs buffer data during peak data rates to optimize the host computer and bus performance to maintain high data throughput. 

FUNCTIONAL CHARACTERISTICS

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