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Zeus

IOPS

3.5-Inch Fibre Channel Solid State Drive 51

READ BUFFER (3Ch)

The READ BUFFER (3Ch) command is complementary to the WRITE BUFFER command as a

diagnostic function for testing logical unit memory in the SCSI device and the integrity of the service

delivery subsystem. Only Mode 2 (Data) and Mode 3 (Descriptor) are supported. The BUFFER_ID,

OFFSET and CONTROL fields are not supported and must be set to 0 (zero).

Table 33. Read Buffer (3Ch) CDB

Notes:

1 The capacity of the buffer is 4,096 bytes. This is the length that is returned if the Descriptor

mode is set (Mode 3).

2 If the Data mode is set (Mode 2), then command is rejected unless the Allocation Length

is a multiple of 4 bytes. The maximum allocation length is 2,097,152 (2 megabytes).

3 If the allocation length is greater than 4,096, the buffer will wrap and the data that is

returned is the last 4K that was written using the WRITE BUFFER command, repeated as

many times as necessary.

Bit

Byte76543210

0 Operation Code (3Ch)

1 Reserved Mode

2 Buffer ID

3 (MSB)

Buffer Offset

5 (LSB)

6 (MSB)

Allocation Length

8 (LSB)

9 Control

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 109 110

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SimpleTech ZeusIOPS Manual Pagina 53