Viper 60s Theory Of Operation And Maintenance Manual page 123

VIPER SCSI COMMANDS
5.23 SEND DIAGNOSTIC (1 Dh)
The SEND DIAGNOSTIC Command causes Viper drive to perform diagnostic self-tests on
the buffer memory. The tests are part of the Viper drive resident firmware. No data is
transferred between the Viper drive and the Initiator during this command.
Good Status is returned if the tests ran successfully.
5.23.1 SEND DIAGNOSTIC Command Descriptor Block
I
BITS
7
I~
5
I
4-+3
i
2
I
1
f1
BYTE
i
..-~-~
.....
· 0 i . . . . . . . . .
;-1
0 0
i
0 0
1 . 1
1
---1
1
I
0 0 0 0 0 1 o •
0
-- 0ct8
2 0 0 0 0 0 0
I
3 0 0 0 0 0 0
0 0 ·
0 0 0 0 0
--
.~-----j
4
i i
•
0
0
•
0
I
5
i
x
I
x
0 0
i
0
•
0
I I
i i
5.23.2 Command Descriptor Block Field Descriptions
Self Test Bit
UnitOfl and
Devall Bits
3-4
2
o
to 1
5-65
DESCRIPTION
This bit must be set to one. It indicates that
drive is to perform its self-test procedures and
that a parameter list is not used.
These bits must be set to zero. They are
inapplicable since the Viper drive self-test does
not use the medium during testing.
These fields must be set to zero. They are
inapplicable when the Self Test bit is set to one.