IBM IC35L018UCDY10, Specifications

Page: 185 / 249

8.43 WRITE BUFFER (3Bh)
LINK FLAG Reserved = 0 VU = 0 9
(MSB)
Parameter List Length
(LSB)
6
7
8
(MSB)
Buffer Offset
(LSB)
3
4
5
Buffer ID 2
Mode Reserved = 0 1
Command Code = 3Bh 0
0 1 2 3 4 5 6 7
Bit
Byte
Figure 172. WRITE BUFFER (3B)
The WRITE BUFFER command is used in conjunction with the READ BUFFER command as a diagnostic
function for testing the memory of the drive and the SCSI bus integrity. This command does not alter the
medium of the drive. Additional modes are provided for downloading microcode and for downloading and
saving microcode.
This command will cause the entire cache to be emptied.
The function of this command and the meaning of fields within the command descriptor block depend on
the contents of the mode field.
MODE Description
0000 Write combined header and data
0010 Data
0100 Download Microcode
0101 Download Microcode and Save
0111 Download Microcode and Save (Single Binary Chunked)
1010 Write Data to Echo Buffer
No other modes are supported by the drive.
Ultrastar 146Z10 hard disk drive specifications
169