SPI-2 Rev08 Questions (forwarded)

[John Lohmeyer - SCSI]

* From the SCSI Reflector, posted by:
* John Lohmeyer - SCSI <jlohmeye>
*
I found this posting bounced to the administrator account
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Please direct your responses to either the reflector address
scsi at symbios.com or to Paul A. Levin (palevin at netcom.com).

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> Date: Tue,  2 Jul 96 21:53:21 PDT
> Subject: SPI-2 Rev08 Questions
> To: scsi at symbios.com
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> Dear SCSI-ites,
> 
> Could someone please help me to understand some of the timing specifications found
> in Rev08? Page 35 specifies minimum assertion and negation periods for FAST-40 to
> be 8.0 nsec at the driver connector and 6.5 nsec at the receiver connector. 
> 
> Figure 20 (on page 36) seems to indicate minimum setup and hold times (or is it a
> setup time plus a hold time?) of 9.25 nsec at the driver connector and 4.75 nsec
> at the receiver connector. There are similar discrepancies for FAST-80.
> 
> What, pray tell, are the correct timings?
> 
> Also, is there any differential transceiver available which meets the FAST-40 spec?
> 
> Thank you for any information.
> 
> _________________________________________________
> Paul A. Levin
> (palevin at netcom.com)
> 
>