IBM IC35L036UWDY10 Hard Drive Specifications - Page 185

WRITE BUFFER 3Bh, Reserved = 0, VU = 0, Parameter List Length, Buffer Offset, Buffer ID

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8.43 WRITE BUFFER (3Bh) Byte 0 1 2 3 4 5 Bit 7 6 5 4 3 2 1 0 Command Code = 3Bh Reserved = 0 Mode Buffer ID (MSB) Buffer Offset (LSB) 6 (MSB) 7 8 Parameter List Length (LSB) 9 VU = 0 Reserved = 0 FLAG LINK 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 0000 0010 0100 0101 0111 1010 Description Write combined header and data Data Download Microcode Download Microcode and Save Download Microcode and Save (Single Binary Chunked) Write Data to Echo Buffer No other modes are supported by the drive. Ultrastar 146Z10 hard disk drive specifications 169

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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