Quantum DLT-S4 Podręcznik Użytkownika Pobierz pdf (Strona 301)

100

101

Chapter 4 SCSI Commands

READ BUFFER Command (3Ch)

DLT-S4 Interface Reference Guide 267

Combined Header and

Data Mode (00h)

In this mode, the drive returns a 4-byte header followed by data bytes.

The drive terminates the DATA IN phase or FCP_DATA IU when the

Allocation Length bytes of header and data have been transferred or

when all available data has been transferred to the initiator, whichever is

less.

The 4-byte

READ BUFFER header is followed by data bytes from the

target data buffer. Figure 130

illustrates the format of the header.

Figure 130 READ BUFFER

Header — Data Format

Table 149 READ BUFFER

Header — Field Description

Data Mode (02h) 4 In this mode, the DATA IN phase or FCP_DATA IU sent to the initiator

contains only buffer data. This mode can be used to check the diagnostic

read buffer to see if an unexpected error has occurred.

Bit

7 6 5 4 3 2 1 0

Byte

0 Reserved

1 — 3

(MSB)

Available Length

(LSB)

Field Description

Available Length Specifies the total number of data bytes available in

the target’s buffer. This number is neither reduced

to reflect the allocation length nor to reflect the

actual number bytes written using the

WRITE

BUFFER

command. Following the READ BUFFER

header, the drive transfers data from its data

buffer.

1 2 ... 296 297 298 299 300 301 302 303 304 305 306 ... 385 386

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