Toshiba Pbdp-110 Manuale Utente

 

  

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•  If the request was a read, and the read was performed successfully, 

this will be indicated to the master by Resp1:Resp0 changing from 0:0 
to 0:1.  The parameter number response will equal the accessed 
parameter number, and the resulting data read will be placed in the 
data / error code response word. 

•  If the request was a write, and the write was performed successfully, 

this will be indicated to the master by Resp1:Resp0 changing from 0:0 
to 1:0.  The parameter number response will equal the accessed 
parameter number, and the data written to the drive will be reflected in 
the data / error code response word. 

•  If an error occurred during the read or write request, this will be 

indicated to the master by Resp1:Resp0 changing from 0:0 to 1:1.  
The parameter number response will equal the parameter number 
that the master was attempting to access, and an error code reflecting 
the failure cause will be placed in the data / error code response 
word.  For a list of possible error codes, refer to section 10.4. 

6.  In order to perform another parameter read or write, the master must once 

again send a “no action” code (Req1=0 and Req0=0), and the PBDP-110 
must once again respond with an idle state acknowledge (Resp1=0 and 
Resp0=0) before the next read or write action can take place.  Until a “no 
action” code is sent to the PBDP-110, the interface will ignore all data in 
the action bits, parameter number and parameter write data words.  Also, 
as long as the master sends the “no action” code, the PBDP-110 will loop-
back in the parameter number response word and parameter data / error 
code response word whatever data is sent to it in the corresponding 
output words. 

 

The above procedure explanation holds true for both drives A and B, using the 
respective request and response locations in the output and input data 
structures. 

 
 

When a parameter read or write error occurs, one of the following error codes 
will be returned in the parameter data response word: 
 
  Error Code 

 0x0000 ......................cannot 

execute 

 

0x0001 ......................data error (written data value outside of valid range) 

 

0x0002 ......................invalid parameter number 

 

0x0064 ......................attempt to write to a read-only parameter 

 

0x0065 ......................attempt to read from a write-only parameter 

 

0x0066 ......................other / unclassified error