Date: 14 Dec 1998 12:36:04 +0100 From: Martin Recktenwald <mreckt@wurzelausix.CS.Uni-SB.DE> To: Gerald Heinig <heinig@hdz-ima.rwth-aachen.de> Cc: freebsd-isdn@FreeBSD.ORG Subject: Re: ISAC & HSCX questions Message-ID: <wtz7lvvufa3.fsf@wurzelausix.cs.uni-sb.de> In-Reply-To: Gerald Heinig's message of "Sun, 13 Dec 1998 18:21:32 %2B0100" References: <3673F79C.DC25867@hdz-ima.rwth-aachen.de>
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Gerald Heinig <heinig@hdz-ima.rwth-aachen.de> writes: > Why do they refer to the data read and write registers as FIFOs? There > doesn't seem to be anything queue-like about them. Maybe because you can write at the FIFO where you want but it will alway store the bytes in the order you wrote them? For example, write to fifo addr 04 value 11, then to 02 value 22 and ISAC/HSCX will store in its fifo value 11 as first byte and value 22 as second ... (well this sounds really difficult to understand :-), forget it, they are no fifo's, but they are also not some kind of storage you can write/read as you want.) > Why isn't there any documentation about the HSCX specifically? I > downloaded the HSCX docs from Siemens, but there they talk about > upgrading the ISAC-S TE to a larger FIFO and other stuff. The last time I looked at there were docs about the HSCX. What you found seems like some kind of "upgrade" information to the IPAC. Try downloading the HSCX documentation directly. Siemens obviously uses the same naming scheme for all ISDN related chips, so if you use something like doc2286psb.pdf to download the isac documentation, use doc82525psb.pdf to get the HSCX documentation :-) If you can't find the docs, send me mail, I have at least the HSCX 82525 docs still lying around (maybe even the HSCX-TE docs). > How do you find out things like a Fritz! card having 0x05 in the low > order bits of <some register> (I forget) and an AVM A1 having 0x04 or > 0x05 in the same place? > That's card-specific, isn't it? Yes, it is. All HSCX/ISAC boards I saw use a third (custom) chip and getting docs about it is quite likely a very difficult task. > Does the Fritz! driver use the > IOM functionality? This doesn't depend on the driver but on the hardware. The AVM Fritz! uses IOM-2 mode for communication between HSCX and ISAC. Martin. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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