[ubuntu-it] Masterizzatore e DMA

m.garavaglia a siscat.it m.garavaglia a siscat.it
Mer 6 Ago 2008 13:12:53 BST


> Message: 2
> Date: Wed, 06 Aug 2008 03:20:35 +0200
> From: Corrado <manyskills a libero.it>
> Subject: [ubuntu-it] Masterizzatore e DMA
> To: UbuntuLinux-it <ubuntu-it a lists.ubuntu.com>
> Message-ID: <1217985635.9834.9.camel a USSVoyager>
> Content-Type: text/plain; charset=ISO-8859-15
>
>
> Sul mio sistema ho, sul canale IDE secondario, un masterizzatore DVD e
> un lettore DVD, il primo settato come master, il secondo come slave, anche tramite i jumper (in maniera specifica master e slave, no modalitÓ
> automatica); ho proceduto alla sostituzione del vecchio cavo IDE 40 pin con uno a 80 pin. Ciononostante, il messaggio che ricevo tramite
>
> dmesg | grep DMA
>
> Ŕ sempre lo stesso:
>
> ATAPI: DVDRW IDE 16X, VER A07M, max UDMA/66
> ata2.00: limited to UDMA/33 due to 40-wire cable
>
>
> Mi sembra che dal punto di vista hardware la procedura seguita sia
> corretta, Ŕ possibile il problema sia altrove...?
>
>
> --
> Corrado
E la scheda madre che deve capire se il cavo e a 40 o 80 conduttori ( non pin, sempre 40)
da:  http://www.pcguide.com/ref/hdd/if/ide/confCable80-c.html

In the ATA/ATAPI-4 standard that introduced the Ultra DMA transfer mode set, a new cable was introduced to replace the old standby: the 80-conductor
IDE/ATA cable. The name is important: the new cable has 80 conductors (wires)--it does not have 80 pins on each connector, though, just 40. This
means that the new cable is pin-compatible with the old drive. No change has been made to the IDE/ATA connectors, aside from the color-coding issue
(see below).

e


Detection: Since the cable is mandatory for high-speed modes, the system has to have some way of knowing it is installed. This is done by having the
/PDIAG:/CBLID signal, carried on pin #34 of the interface, grounded in the connector that attaches to the motherboard. Since the older 40-conductor
cable would not have this pin grounded, by looking for the grounding on this pin at startup the host can determine if the 80-conductor cable is
installed

Ciao

Marco




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