Chapter 4 SCSI Commands
WRITE BUFFER Command (3Bh)
DLT-S4 Interface Reference Guide
341
WRITE BUFFER Command (3Bh)
4
The
WRITE BUFFER
command works with the
READ BUFFER
command
as a diagnostic function for testing the device data buffer, DMA engine,
interface hardware, and interface network integrity. It is also used to
download and update microcode (firmware).
Figure 172
WRITE BUFFER
Command Descriptor Block
—
Data Format
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation Code (3Bh)
1
Reserved
Mode
2
Buffer ID (00h)
3 — 5
(MSB)
Buffer Offset
(LSB)
6 — 8
(MSB)
Parameter List Length
(LSB)
9
Control
