cavo ata e udma

[dasoca]

Ciao raga scusate la profonda ignoranza , mi dite la differenza tra un cavo ide ata 133 80 poli e un cavo ultra dma 133?
grazie

[Max_R]

Ma non è la stessa cosa? IDE e UDMA non sono sinonimi?

[Max_R]

Assieme ad ATA naturalmente...

[af624726]

i cavi sono pressocchè identici, la differenza stava tra i cavi a 40 fili e quelli da 80
"A drive setting called cable select was described as optional in ATA-1 and has come into fairly widespread use with ATA-5 and later. A drive set to "cable select" automatically configures itself as master or slave, according to its position on the cable. Cable select is controlled by pin 28. The host controller grounds this pin; if a device sees that the pin is grounded, it becomes the master device; if it sees that pin 28 is open, the device becomes the slave device.

With the 40-wire cable it was very common to implement cable select by simply cutting this wire between the two device connectors. This puts the slave device at the end of the cable, and the master on the "middle" connector. This arrangement eventually was standardized in later versions of the specification. Unfortunately, if there is just one device on the cable, this results in an unused "stub" of cable. This is undesirable, both for physical convenience and electrical reasons: The stub causes signal reflections, particularly at higher transfer rates.

When the 80-wire cable was defined for use with UDMA4, these details were changed. The master device now goes at the end of the cable, so if there is only one device on the cable, there is no cable "stub" to cause reflections. Also, cable select is now implemented in the slave device connector, usually simply by omitting the contact from the connector body. Since 80-wire cables require special connectors anyway, this was a small additional effort. The standard also dictates color-coded connectors for easy identification by both installer and cable maker."
da: http://en.wikipedia.org/wiki/UDMA

[Max_R]

Ottimo approfondimento Af
Comunque ribadisco... ATA IDE ed UDMA sono sinonimi

[af624726]

Ottimo approfondimento Af
Comunque ribadisco... ATA IDE ed UDMA sono sinonimi

grazie

[dasoca]

Grazie per le delucidazioni!!!!

[Max_R]

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