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
*
* For SCSI Reflector information, send a message with
* 'info scsi' (no quotes) in the message body to majordomo at symbios.com




More information about the T10 mailing list