Quantum DAT 24 Drive Guía de usuario descargar pdf (Pagina 146)

Page 134 DDS-4 SCSI Interface Manual, Rev. B

Byte

Bits

7 6 5 4 3 2 1 0

15 SKSV C/D 0 0 BPV | Bit Pointer

16 MSB—Field Pointer

17 Field Pointer—LSB

Sense Data Field Descriptions

The Sense Data field descriptions are shown in the following table.

Field Name Bytes Bits Description

Valid bit 0 7 The Valid Bit indicates that the Information field (Bytes 3 to 6)

contains a valid residual length. If the Valid Bit is 1, Residual Length

is the requested length minus the actual length in blocks or bytes.

For example:

If: Write Transfer Length = 1000 blocks

Residual Length = 896 blocks

Blocks transferred to drive = 192

Then: Transfer Length – Residual Length = Data written to tape

1000–896 = 108

And: Blocks transferred to drive – Data to tape = Data trapped

in buffer; 192 –108 = 84

Error Code 0 0-6 70h: Indicates current errors

71h: Indicates a deferred error

FM bit 2 7 The FM bit indicates that the current command has read a Filemark

or a Setmark (if the RSMK bit is set).

EOM bit 2 6 The EOM bit indicates one of the following:

Early-warning has been reached or passed in the forward direction.

The command could not be completed because BOP was

encountered in a space reverse command.

Incorrect

Length

Indicator

(ILI)

2 5 If this bit is 1, a block was read that has a length different than that

which is specified.

Sense Key 2 0-3 This field indicates the status of the last command and provides a

generic error category.

Information 3-6 See Valid bit.

Additional

Sense

Length

7 A number greater that zero in this field indicates that bytes 8 through

N contain information.

Additional

Sense

Code

12 This field provides further detail for the current Sense Key.

Additional

Sense

Code

Qualifier

13 This field provides further detail for the current Additional Sense

Code.

SKSV bit 15 7 If the Sense Key Specific Valid (SKSV) bit is set (1), bytes 15-17

may be used to determine the first illegal parameter that caused an

Illegal Request sense key (as defined below).

C/D bit 15 6 If the Command/Data (C/D) bit is set (1), the illegal parameter is in

the CDB. Otherwise, it is in the parameters sent in the Data-Out

Phase.

BPV bit 15 3 When the Bit Pointer Valid (BPV) bit is set (1), the Bit Pointer field

indicates the bit field in error.

Bit Pointer 15 0-2 This field points to the most significant bit of the field in error.

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 180 181

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