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100

101

SCSI-2 Drive Command Set

Pre-Fetch (34H)

Chapter 22-94

Pre-Fetch (34H)

The Pre-Fetch command is used to transfer the specified number of data

blocks starting from the specified logical block address to cache memory.

Immed An Immediate bit of 1 indicates that the drive returns a

status as soon as the command descriptor block is

validated.

An Immed bit of 0 indicates that the status is not

returned until the operation is completed.

Transfer

Length This field indicates the number of contiguous logical

blocks of data to be transferred.

Rel Adr A relative address bit of one indicates that logical block

address specified is a two’s complement offset from the

last logical block address accessed.

A value of 0 indicates that the logical block address is an

absolute address.

Table 2-81 Pre-Fetch Command

Byte 7 6 5 4 3 2 1 0

0 Operation Code (34H)

1 Reserved (0) Immed RelAdr

2 Logical Block Address (MSByte)

3 Logical Block Address

4 Logical Block Address

5 Logical Block Address (LSByte)

6 Reserved (0)

7 Transfer Length (MSByte)

8 Transfer Length (LSByte)

9 Reserved (0) Flag Link

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 377 378

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