READ BUFFER

Table 63. READ BUFFER Command

 

7

6

5

 

4

 

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Operation Code (3Ch)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Logical Unit Number (0)

 

Reserved

 

 

Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

Buffer ID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

:

 

 

 

 

Buffer Offset

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

:

 

 

 

 

Allocation Length

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The READ BUFFER command reads data from the memory on the drive and sends it to the initiator.

Modes 000b, 010b and 011b are supported. If it is set to 010b, then just the data is returned. If it is set to 011b, just the descriptor is returned.

If the Mode is set to 0111b and the Buffer ID is 0, the descriptor returned is for the Main Data buffer. The format of the 4-byte descriptor is shown in Table 64. The Buffer ID indicates which buffer is to be read. The Buffer Offset field may be set to any address in the buffer.

Note: The Main Data buffer is larger than capacity of the read buffer offset and capacity fields to express (32 megabytes). To compensate for this, the buffer offset and capacity fields for the Main Buffer (buffer ID = 0) are interpreted and expressed such that each unit represents 64 bytes. This is only true for buffer modes 000b, 001b, 010b, 011b, and 111b.

Table 64. READ BUFFER Descriptor

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

0

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

:

Buffer Capacity

3

Chapter 2. Command Support 49

Page 63
Image 63
IBM T200F manual Read Buffer Command, Read Buffer Descriptor, Reserved

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