Recent technical history of Power1401-3 firmware

There are two types of firmware in the Power1401: software and hardware. The software firmware is the program code that tests the Power1401 when you switch it on and that then obeys instructions transmitted from the host. The hardware firmware includes controls for components such as the ADC and DACs, the clocks, the digital input and output, and the host ports.

Revision 05 - Freely down-loadable now.

Date Revision Summary
04/14 05 Monitor 5


  • Monitor: Improved interrupt behaviour. This significantly improves the worst case response time and slightly improves the average response time.
  • Added DAC0-ADC serial loopback controlled by FeatEn bit 7.
  • Clock3 now has own dividers (like clock4).
11/13 04 Monitor 4


  • Monitor: Host port idle time change; improves spike shape matching time latency in Spike2.
  • Cache invalidation change; improves Signal dynamic clamp model updates.
  • Improvements to the DAC updating on top boxes. 8-bit DAC mode corrected.
12/12 02 Monitor 2

Boot 1


  • Monitor: GAIN command adjusted to read back top box channel gains correctly.
  • Identifies top boxes correctly when more than 1 top box is fitted.
11/12 01 Monitor 1

Boot 1


  • Monitor: Improved handling of USB cable detection, single-channel ADC operation improved to allow up to 3 MHz.
  • Boot: Improved 200 MHz lock detection after a reset.
  • FPGA: Topbox DAC usage corrected. ADC overrun detection improved.
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  • Milton,
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  • Technical Centre,
  • 139 Cambridge Road,
  • Milton,
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Privacy policy

CED, through this site, does two things that relate to privacy. We would like to explain them.

Emails from down-loads

We offer free down-loads of many files on our site, from test programs to complete install files for updated versions of major packages like Spike2 and Signal.

When customers wish to take a down-load of a major package, we ask a few questions, including their name, email address, the serial number of the software for which they seek an upgrade and whether they would like an automatic email whenever we update the product. This information is emailed back to CED when they access the final down-load screen. Within this email, your browser transmits the type and version of browser you are using, and the screen resolution you are running.

The reasons why we take and keep this information are that it is useful for our software development team to know who has taken the latest versions, and it is useful for our web site development team to know which browsers people are using to view our site, and what resolution they have their screens set to.


When people down-load a major package, we try to write a cookie, a small file in your computer, that records your name, serial number of the software package, and the version you are down-loading. These files have a lifetime of one year.

The reasons for storing this information are firstly that if you ask for another down-load some other time, your details are read from the cookie and are pre-written into the form, to save you looking them up again. The other reason is that next time you access our site, your browser looks through your CED cookies and compares the versions down-loaded with the latest version numbers read from our site. If there is a later version of a product you have already down-loaded, we tell you on the home page screen, so you know that it is worth going to the down-load page again.

None of this information is ever given to anyone outside CED. ×