Hardware Secrets

Home | Camera | Case | CE | Cooling | CPU | Input | Memory | Mobile | Motherboard | Networking | Power | Storage | Video | Other
First Look
Gabriel’s Blog
Main Menu
About Us
Awarded Products
Manufacturer Finder
On The Web
RSS Feed
Test Your Skills
Subscribe today!

Home » Storage
CE-ATA Standard
Author: Gabriel Torres
Type: Articles Last Updated: August 23, 2005
Page: 2 of 2

CE-ATA connector has four data pins, and because of that is also called ”4x CE-ATA“ or ”4-bit CE-ATA“. At first engineers tried to use the same connector used by MMC cards, but one problem emerged: crosstalk.

Crosstalk is basically when a signal carried in one wire interferes or even corrupts the signal that is being transmitted in the wire adjacent to it. Physically speaking, this happens because when we have a data being transmitted over a wire, it generates a electromagnetic field around it, and a wire inside this field acts like an antenna, capturing the signal thus modifying the signal that was being originally transmitted in that particular wire.

This is also a very particular problem on CE-ATA drives because both CF+ and MMC standards were originally created to be used by memory cards. As you know, memory cards don’t use a flat-cable to be connected to the host device (card reader): you just plug in the card inside the reader and that’s it. On CE-ATA drives, however, the engineers decided to allow them to use a small flat-cable, allowing better accommodation for the hard drive inside the consumer electronics device. However, this flat-cable helps the antenna-factor problem.

In Figure 4, you can see data being transmitted from a CE-ATA drive to a CE device using the standard MMC connector. The crosstalk was of 375 mV, which is very high.

CE-ATA Crosstalk
click to enlarge
Figure 4: Crosstalk problem on CE-ATA using MMC connector.

The solution was to change the position of the signals on the connector. Instead of putting data signals side-by-side, engineers changed that approach and put a voltage or a ground signal between data signals, which are immune to the electromagnetic interference and work as a shield, solving the cross-talk issue.

CE-ATA Connector Pinout
click to enlarge
Figure 5: CE-ATA connector pinout compared to MMC connector pinout.

The result was a crosstalk of only 59.6 mV, as you can see in Figure 6. A crosstalk that low doesn’t interfere on the drive’s communication.

CE-ATA Crosstalk
click to enlarge
Figure 6: Signal transmission on CE-ATA using its final connector.

« Previous |  Page 2 of 2
Print Version | Send to Friend | Bookmark Article | Comments (0)

Related Content
  • Everything You Need to Know About Serial ATA
  • Recovering Hard Disks with Bad Blocks
  • Everything you Need to Know About ATA-66, ATA-100 and ATA-133 Hard Disks
  • Everything you need to know about RAID
  • How to Install Hard Drives over 8 GB in Older PCs

  • RSSLatest News
    LUXA2 Releases New P1-PRO Battery Power Pack
    October 1, 2013 - 7:23 AM PST
    MSI unveils GP70 and GP60 Laptops
    September 30, 2013 - 7:23 AM PST
    AMD Unveils Next-Generation Radeon Graphics Cards
    September 27, 2013 - 5:33 AM PST
    Genius Introduces Energy Mouse in North America
    September 27, 2013 - 5:32 AM PST
    Apple Updates iMac
    September 25, 2013 - 5:27 AM PST
    .:: More News ::.

    2004-13, Hardware Secrets, LLC. All rights reserved.
    Advertising | Legal Information | Privacy Policy
    All times are Pacific Standard Time (PST, GMT -08:00)