Viper 60s Theory Of Operation And Maintenance Manual page 116

VIPER SCSI 60, 125
&
150 THEORY OF OPERA TlON AND MAINTENANCE
5.21 MODE SENSE (1 Ah)
The MODE SENSE command provides a means for Viper drive to report its current mode
settings to the Initiator.
5.21.1 MODE SENSE Command Descriptor Block
6 5 4 2
o
o
0
o o o
o o o
5.21.2 Command Descriptor Block Field Description
I
BIT
I
I
. NAME BYTES
!.
BITS
I
DESCRIPTION
4
- - -
This byte specifies the number of bytes the Viper
drive returns in the Data-In Phase. An Allocation
Length of zero means no MODE SENSE data is
transferred. This condition is not considered to
be an error. When non-zero, the number of bytes
specified in Allocation Length is transferred up to
a maximum of 12
5.21.3 MODE SENSE Header Data Format
The MODE SENSE response data consists of a four-byte header followed by an eight-byte
block descriptor.
ModeSense Data Length (OBh)
Buffered
Block Descriptor Length (OSh)
5-58