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4.3 SCSI Commands
C156-E224-01EN 4-13
4.3.3 READ CAPACITY command
Table 4.7 READ CAPACITY command
Bit
Byte
76543210
0 Operation Code (25h)
1LUN Reserved
2-7 Reserved
8 Reserved PMI
9Reserved
The READ CAPACITY command transfers data related to the media capacity to
INIT. Any value specified for the Partial Medium Indicator (PMI) bit is ignored.
The transfer data is listed in Table 4.8.
Table 4.8 READ CAPACITY data
Bit
Byte
76543210
0-3 Last Logical Block Address
4-7 Block Length in Bytes
Last Logical Block Address indicates the address of the last block that can be
accessed.
Block Length in Bytes indicates the number of bytes per block.
4.3.4 MODE SELECT command
Table 4.9 MODE SELECT command
Bit
Byte
76543210
0 Operation Code (15h)
1 LUN PF Reserved SP
2-3 Reserved
4 Parameter List Length
5Reserved
The MODE SELECT command sets various device operating modes.
The Page Format (PF) bit must be 1. If the PF bit is 0, the command responds
with Check Condition. If the Save Pages (SP) bit is 1, the ODD saves all
parameter values transferred to flash ROM. Parameter List Length specifies the
number of bytes in the mode parameter to be transferred. If the value is 0, the
command ends normally without transferring any data. If the transferred mode