Ebos, Read Buffer command Echo buffer descriptor

(5)Mode = 1, 0, 1, 0 : Echo buffer

In this mode the IDD transfers data to the INIT from the echo buffer. The echo buffer shall transfer the same data as when the WRITE BUFFER command with the mode field set to echo buffer was issued. The BUFFER ID and BUFFER OFFSET fields are ignored in this mode.

(6)Mode = 1, 0, 1, 1 : Echo buffer descriptor

In this mode, a maximum of four bytes of READ BUFFER descriptor information is returned. The device server shall return the descriptor information for the echo buffer. The "Buffer Offset" field is reserved in this mode. The allocation length should be set to four or greater. The device server shall transfer the lesser of the allocation length or four bytes of READ BUFFER descriptor. The READ BUFFER descriptor is defined as shown in Figure 3.27.

Byte	Bit	7	6		5		4	3		2	1	0
		7	6		5		4	3		2	1	0


	0						Reserved					EBOS

	1						Reserved

	2			Reserved					Echo Butffer Capacity (MSB)

	3					Echo Buffer Capacity (LSB)

Figure 3.27 READ BUFFER command: Echo buffer descriptor

The IDD return one in EBOS field, and the IDD verifies that echo buffer data from each initiator is the same as that previously written by the same initiator.

The "Buffer Capacity" field returns the size of the echo buffer X'0200' in bytes aligned to a four-byte boundary.

3 - 128

C141-E124-01EN

MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

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Fujitsu MAN3735, MAN3367, MAN3184 specifications Ebos, Read Buffer command Echo buffer descriptor

Models: MAN3735 MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES MAN3367 MAN3184

Reserved

EBOS

Reserved

Figure 3.27 READ BUFFER command: Echo buffer descriptor

MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications