Aviation Buses and Descriptions

Here is the main page that covers the topic of Avionics Data Buses. Normally an Avionic Interface is a cable bus, either copper or fiber. However; there are a number of Backplane buses used in the Avionics Industry.

Anyway I added more data to the Commercial Standard Digital Bus [CSDB]. CSDB is an Avionics data bus based on RS422 interface. The CSDB standard was released in 1983, while the last release or revision I've found is 1993. I'm sure that this copper wire interface is still in common use, if only based on the length of time planes are kept flying.

I also updated the page that lists data buses by letter; Interface Buses 'C'.

Data, information and specifications are hard to find for avionics buses.

The attached pic is under a GNU license, a 727 which were retrofitted with the then new CSDB interface. Of course there are other planes that used the CSDB interconnect.

Weight is the main issue, you want a serial bus using Fiber, not Copper wire.....

USB IC Interface Buses

The USB 2.0 standard contains provisions for two different Integrated Circuit interfaces, [IC-to-IC buses] ~ Chip-to-Chip Bus.

The first interface bus is an implementation of the USB protocol using LVCMOS as the electrical interface. HSIC or High-Speed Inter-Chip uses DDR as the data transfer method, and operates at 240MHz, which is the only speed. A link was added off the Interface Buses 'H' page, and USB page.

The second USB IC interface is called Inter-IC USB, or IC_USB. This interface bus resembles USB more than the HSIC interface. A link was added of the Interface Buses 'I' page, and the USB page. This interface is a transition from the cable USB interface to the IC, after the connector.

Neither new page was listed to the IC Buses page, I'll need to do that later. The 'all buses' page is already getting to large, so the listing will not be added.

I used the 1-wire bus page as the starting point for both pages, which was also updated today.

In almost all cases a chip-to-chip interface only operates between two IC's on the same Printed Wiring Board [PWB], some times more than one IC. Normally an IC-to-IC bus will not drive a cable or a backplane, but there are always exceptions. LVDS is but one example that is both a chip-to-chip interface or cable interface, IEEE-644 is another.

I'll try and get these two pages into the sitemap before the end of the week.

Secure Digital Card Format

I made some small up-dates to the Secure Digital format family of pages. There is no root page, but the Secure Digital [SD] page is located on the Secure Digital Card Pinout page. The SD page provides the signal assignments and a very small description. The SD Card points to the Secure Digital I/O card page [SDIO]. The SDIO page again provides a card pin out.

Not sure which page point to the MiniSD card page, or the MicroSD card page. But, in all cases these are pinout pages with no real bus or interface description.

Looks like it's time to up-date these pages. The complete list of possible Flash Memory card formats. Which are all listed off the main Personal Computer Buses page.....

I think MicroSD is still the smallest card format you can get.

Again these are pin out tables [pinout] or sometimes called signal assignments ~ the pin out as seen from the interface or connector. A description is missing from any of the pages

Optimizing html Code

I've been out checking pages that have not been updated in a while, adding a Google Search Bar. On some of the pages I also check its status via Google Analytics ~ see how the page is doing.

I have 4 pages covering SGI interface pinouts, which also happen to be obsolete. They don't bring in much traffic, but the visits are pretty constant.
Silicon Graphics Inc [SGI] Monitor Port on a D-Sub 15 pin connector.
Silicon Graphics Inc [SGI] Digital Video Port for the O2Cam.
Silicon Graphics Inc [SGI] Digital Video Monitor Port with a DB-9 pin Connector.
Silicon Graphics Inc [SGI] Flat Panel Monitor Port for a Presenter 1280.
Those pages only list connector pinouts, some use the term Signal Assignments.

Another page I checked of interest was the Military Circular Connector page for MIL-DTL-83723 Connectors. This page helps to decode the part number, or generate one. A related page covering measuring EMI for Military users is MIL-STD-462. The MIL-462 page is linked of the Military Specifications page. While the MIL-83723 page is listed on the Military Spec Connectors page. However its link seems to be missing from the page that lists Military Connector Manufacturers page ~ I'll add it tonight.

These are minor up-dates, no content. I'm really just checking the pages and add the search bar, that is about it..

Then I see this page that covers Frequency Range vs Circular Connector Type. Hmm, only gets a few hits a day.....