Electronicdesign 14151 Promosurvivalkit 622980566
Electronicdesign 14151 Promosurvivalkit 622980566
Electronicdesign 14151 Promosurvivalkit 622980566
Electronicdesign 14151 Promosurvivalkit 622980566
Electronicdesign 14151 Promosurvivalkit 622980566

Will ISA Survive?

March 20, 2017
Is it time to Industry Standard Architecture (ISA) and Peripheral Component Interconnect (PCI) to go away?

How long does old tech need to survive? It might be half an hour in the consumer space, but on the embedded side it is measured in multiple decades, and in the form of interfaces like serial ports and RS-232.

The Industry Standard Architecture (ISA) Peripheral Component Interconnect (PCI), and Versa Module Europa (VME) are the parallel buses that once dominated the embedded and PC space. But these days PCI’s successor, PCI Express (PCIe), runs faster and uses fewer circuit board traces because of its serial nature. Even Ethernet has joined PCIe on some backplanes.

Form factors like PC/104 have been utilizing multiple interfaces like Diamond System’s Aries PC/104-Plus (Fig. 1) with an Intel E3800 Atom that supports PCI Express. Compare this to the latest Diamond System’s Venus (Fig. 2) that has a PCI, two Mini-PCIes, and OneBank Plus sockets. Two of the three interfaces use PCIe. FPGAs or bridge chips are needed to handle interfaces like PCI and ISA when the processor only provides PCIe. Chip availability has become an issue for these parallel platforms, even as they continue to thrive because of the long-term nature of embedded systems.

1. Diamond System’s Plus uses an Intel E3800 Atom that supports PCI Express, but it has ISA and PCI parallel busses requiring bridge interfaces.

The challenge is that even availability of compatible support chips is waning despite their prices rising. One VME support chip has been discontinued, which forced many vendors to buy a supply to support their customers for another decade.

2. The Venus also has PCI, but the two Mini-PCIe and OneBank Plus sockets can take advantage of the processor’s native PCIe support.

The other problem with something like ISA is that it is a 5 V system, so buffers need to provide level shifting. These days it is not uncommon to have this on the processor and peripheral boards that use the latest processor and interface chips. Likewise, peripherals like flash memory typically do not run at 5 V without their own level shifters. The latter take up board space and use more power in an era when both are at a premium.

So, where does your design fit into this discussion?

Sponsored Recommendations

Article: Meeting the challenges of power conversion in e-bikes

March 18, 2024
Managing electrical noise in a compact and lightweight vehicle is a perpetual obstacle

Power modules provide high-efficiency conversion between 400V and 800V systems for electric vehicles

March 18, 2024
Porsche, Hyundai and GMC all are converting 400 – 800V today in very different ways. Learn more about how power modules stack up to these discrete designs.

Bidirectional power for EVs: The practical and creative opportunities using power modules

March 18, 2024
Bidirectional power modules enable vehicle-to-grid energy flow and other imaginative power opportunities. Learn more about Vicor power modules for EVs

Article: Tesla commits to 48V automotive electrics

March 18, 2024
48V is soon to be the new 12V according to Tesla. Size and weight reduction and enhanced power efficiency are a few of the benefits.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!