SOS !
Tang, Jian
jtang at ie0.ie.ac.cn
Mon Jun 23 01:29:34 PDT 1997
* From the SCSI Reflector (scsi at symbios.com), posted by:
* "Tang, Jian" <jtang at ie0.ie.ac.cn>
*
Dear Sir/Madam,
I am an Engineer of Institute of Electronics,
Chinese Academy of Sciences (Beijing, China).
I am very happy to have this opportunity to send e-mail to you,
and pleased to know you are one expert in SCSI-2/3
Protocol Standards from SCSI-3 Working Set, Gloabal
Engineering Documents (1995).
Now, I have some questions to ask you, would you please
offer me some advice and helps ?
Thank you a lot in advance.
Problems are as follows:
We are designing and Debuging a High-rate data recording system,
with one 80c186 CPU & one NCR 53C720-SE(single-ended) SCSI-2
Protocol Controler, and we use SCSI-2 HARD DISK for
recording the data of about 10Mbytes/sec.
The Problem we meet is that we Can NOT add the Synchronouse
Data Transfer Protocal to the system, thus we can NOT nearly
double the transmision speed.
*******
We can NOT add the feature of Synchronouse Data
Transfer, though we have succeeded in finishing the
Wide and Asynchronous Data Transfer for SCSI-2 Hard DISK.
So, the Highest date rate of our system is about 2Mbytes/sec,
and is far to reach the 10Mbytes/Sec of SCSI-2 Standards.
We use 80c186 ASM Language, NCR 53c720 NASM Assemble,
and SCSI SCRIPTS Languages.
Our main References are SYM52C720/SE/53C770 SCSI I/O
Processor - Programming Guide 1.0 and DATA Manual,
SCSI-2 and SCSI-3 Standards and Data Manual, etc.
Would you please help me add the Synchronous Data Transfer
in SCSI-2 Hard Disk?
Your any advice on it is highly appreciated !
I am looking forward to hearing from you.
My contact e-mail is: jtang at ie0.ie.ac.cn
Many Thanks,
Yours,
Tang, Jian
*
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