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The Jentech Dual E can be configured to support four independent half duplex interfaces or two independent full duplex interfaces in a single VMEbus slot providing twice the number of interfaces per chassis when compared with older NTDS products.  These two interfaces independently provide the highest data throughput and the lowest transfer latency for any of the products currently available in the market.  The Dual E board also provides the capability to simultaneously drive four AEGIS clocks from a single board.

The same number of Type E interfaces provided by Jentech use only 1/2 of the chassis space of other NTDS products, allowing easier expansion of existing systems, and eliminating the need in many cases for a VMEbus repeater card and additional chassis.  Smaller chassis systems can be used in areas where space considerations are important. The use of low voltage (3.3v) and ultra-low voltage (2.5v) components allows the Dual E board to be clocked at much higher rates, producing the high performance needed to support two interfaces while still maintaining low power consumption, low noise and minimal heat dissipation and cooling requirements.  Use of FLASH memory on the Dual E board allows on-board storage of all the firmware and data needed to reconfigure the board “on-the-fly” for any combination of operating modes as listed below:

a)

 Up to 2 full duplex interfaces simultaneously

b)

 Up to 4 half duplex interfaces simultaneously

c)

 One full duplex interface and up to 2 half-duplex interfaces simultaneously

This simple reconfiguration capability also minimizes the need for spare boards, since a single Dual E board can be used to replace multiple full or half duplex interface boards.

Much of the hardware and software resources on the Dual E board are dedicated to giving this product the “look and feel” of two separate boards.  This allows for a true 2-for-1 replacement and helps to provide a seamless transition from older products.  In the past, two boards were synonymous with two interfaces, but with the advent of the Jentech Dual E board this is no longer the case.  Multiple independent interfaces can now be supported with a single board product.  The independent nature of these interfaces is supported in part by the features listed below:

FOR USER INSTRUCTION PROCESSING:

-

2 user command registers (CARs) and associated command chains, one for each interface

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 2 Real-time Clocks (RTCs), one for each interface

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 2 Status Registers, one for each interface

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 2 sets of I/O chains (IN, OUT, EI, EF),  four I/O chains per interface

 

FOR VMEbus HANDLING:

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2 VMEbus requester modules, one for each interface

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 2 sets of VME request levels(0 - 3), one of four levels separately selectable for each I/F

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 2 sets of VME interrupt levels(1-7), one of seven levels separately selectable for each I/F

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 2 separate 32-bit VME Interrupt Acknowledge Vectors, one for each interface

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 2 separate 32-bit VME Interrupt Request Status Registers, one for each interface

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 8 VME DMA I/O channels, four DMA channels per interface

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 Fair mode .v. Prioritized bus request type, each interface separately selectable

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 VME64 Block Mode .v. Standard Mode, each interface separately selectable

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 Master .v. Slave Mode, each interface separately selectable

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 High Speed Bus controller, provides fast bus acquisition and efficient use of bandwidth

 

FOR NTDS DATA:

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3 DSP processors, one for each interface and one for non-NTDS processing

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 2 NTDS FPGAs, one for each interface

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 2 sets of NTDS I/O buffers (IN, OUT, EI, EF), four per interface

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 4 NTDS transceivers, two for each full duplex I/F or one for each half duplex I/F

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 4 sets of analog hardware, two for each full duplex I/F or one for each half duplex I/F

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 4 triax connectors, two for each full duplex I/F or one for each half duplex I/F

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 NTDS interface protocols (SIF, parity, burst), each interface separately configurable

 

A row of LEDs viewable from the front panel report back GO-NOGO status independently for each of the two Type E interfaces supported.

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