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[ The PC Guide | Systems and Components Reference Guide | Hard Disk Drives | Hard Disk Interfaces and Configuration | Integrated Drive Electronics / AT Attachment (IDE/ATA) Interface | IDE/ATA Configuration and Cabling ]
Configuration Using Cable Select
An alternative to the standard master/slave jumpering system used in the vast majority of PCs is the use of the cable select system. As the name implies, with this system the cable--or more correctly, which connector on the cable a device is attached to--determines which device is master and which is slave. The goal of cable select is to eliminate having to set master and slave jumpers, allowing simpler configuration.
To use cable select, both devices on the channel are set to the "cable select" (CS) setting, usually by a special jumper. Then, a special cable is used. This cable is very similar in most respects to the regular IDE/ATA cable, except for the CSEL signal. CSEL is carried on wire #28 of the standard IDE/ATA cable, and is grounded at the host's connector (the one that attaches to the motherboard or controller). On a cable select cable, one of the connectors (the "master connector") has pin #28 connected through to the cable, but the other (the "slave connector") has an open circuit on that pin (no connection). When both drives on the channel are set cable select, here's what happens:
If you switch the devices between the two connectors, they swap configuration, the master becoming the slave and vice-versa. Not a very complicated arrangement, and a good idea, it would seem. In fact, if cable select had actually caught on, it would have been great. The problem is that it has never been widely used, and this lack of universality has made cable select unattractive, which is a bit of a chicken and egg situation. Since cable select was never accepted in the industry, most drives come, by default, with the drive jumpered as a master or single drive. This means that to enable cable select, you have to change a jumper anyway, which obviously negates some of the advantage.
But the biggest reason why cable select never caught on was the cable itself. From the very beginning, all 40-conductor IDE/ATA cables should have been made so that they would work with cable select. There's actually no need to have different cable types, because if you set a drive to "master" or "slave" explicitly, it just ignores the CSEL setting. So a cable select cable can be used either way: regular jumpering or cable select.
Unfortunately, regular 40-conductor IDE/ATA cables don't support cable select. (Why this came about I do not know, but I suspect that some bean counter determined they could save five cents on each PC by doing this.) So to use cable select you need a special cable, and these are of course non-standard, making them a special purchase. Also, many people don't understand cable select, nor do they realize it needs a special cable. If you set both drives to "CS" and then use them on a regular (non-cable-select) IDE cable, both drives will configure themselves as "master", causing a configuration conflict.
Making matters worse, the 40-conductor IDE/ATA cable select cables have the "master connector" as the middle device and the "slave connector" as the device at the end of the cable, farthest from the host. For signaling reasons, it's best to put a single drive at the end of a cable, not put it in the middle leaving a "stub" of wire hanging off the end of the channel. But if you do this, that single drive sets itself as a slave with no master, a technically illegal configuration. Worse, suppose you do this, and your hard disk sets itself as a slave, and the system boots from it without problem, as most would. Then, you decide to add a new hard disk. You set it to cable select and attach it to the middle connector. The new drive then becomes the master, and thus moves ahead of the old drive in precedence! The system will try to boot from it instead of your old drive (which some people might want, but many do not.)
To get around this problem, a second type of 40-wire cable select cable was created, the so-called "Y-shaped" cable. On this one, the connector to the system is in the middle, and the slave and master connectors are on the two opposite ends of the cable. This certainly makes things less confusing, but has its own difficulties. For starters, IDE/ATA cables are very limited in length, which means this "Y-shaped" cable was hard to use in large tower systems. All your drives had to be mounted very close to the motherboard or controller card so the cable would reach. And again, the cable was a special item.
As you can see, the traditional way of doing cable select was a total mess, which was why it was never widely adopted. The key reason for this mess was--once again--lack of standardization. I rather expected cable select to eventually wither away. However, when the 80-conductor Ultra DMA cable was introduced, the cable select feature was much improved, changing the potential of this feature. The two key changes were:
These two changes mean a world of difference for the future of cable select. Since these cables will eventually completely replace all of the 40-conductor cables, all systems will be capable of running cable select without any special hardware being needed. As I mentioned before, you can still explicitly set drives to master or slave if you want to, and the CSEL signal will be ignored by the drives. So the bottom line is that these cables work either way, cable select or not. What will finally make cable select catch on? If drive manufacturers and systems integrators widely agree to use it, and the manufacturers start shipping drives with the "CS" jumpers on by default. We'll have to see if this happens.
IDE/ATA cables are often said to be compatible with 40-conductor cables. That's true of normal
40-conductor cables with drives jumpered as master and slave, but not cable select cables.
If you swap a regular (non-"Y-shaped") 40-conductor cable select cable with an
80-conductor IDE cable, the master and slave drives will swap logical positions. If you
don't that to happen, you'll need to change the order that the devices connect to the
Note: A special thanks to
Hale Landis of www.ata-atapi.com for his
assistance in deciphering the mysteries of cable select, especially with the 80-conductor