Quantum DLT 4000 Manual Pagina 259

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SCSI Commands
Quantum DLT 4000 Tape Drive 5-159
5.27 WRITE BUFFER COMMAND (3BH)
The WRITE BUFFER command is used with READ BUFFER as a diagnostic
function for testing the device data buffer, DMA engine, SCSI bus interface
hardware, and SCSI bus integrity. It is also used for downloading and updating
DLT microcode (firmware).
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (3Bh)
1 Logical Unit Number Reserved Mode
2 Buffer ID (00h)
3 - 5
(MSB)
Buffer Offset (000000h)
(LSB)
6 - 8
(MSB)
Parameter List / Data Length
(LSB)
5 Unused Reserved Flag Link
Figure 5–79 WRITE BUFFER Command Descriptor Block - Data Format
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