Read Long (3E) - IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications

7.19 READ LONG (3E)

Byte
7 6
0
1 LUN
2 (MSB)
3
4
5
6
7 (MSB)
8
9 VU = 0
Figure 100. R E A D L O N G (3E)
The R EAD LONG command requests the file to transfer one block of data to the initiator. The transfer
data includes 512 bytes of data and ECC field data.
CORT bit of ZERO causes the logical block to be read without any correction made by the file. A
C O R T bit of one is not supported by the Target (A corrected bit of one causes the data to be corrected
by ECC before transferring the data to the initiator).
Logical Block Address field specifies the logical block at which the read operation shall occur.
Byte Transfer Length. This field must exactly specify the number of bytes of data that are available for
transfer. If a non-zero byte transfer length does not match the available data length, the target terminates
the command with CHECK CONDITION status, the sense key is set to ILLEGAL REQUEST and
an additional sense code set to INVALID FIELD IN CDB. The valid and ILI bits is set to one and the
information field is set to the difference of the requested length minus the actual length in bytes. Nega-
tive values is indicated by two's complement notation.
The transfer length is calculated as follows:
transfer length = logical block size + 34
RelAdr Relative Block Address is not supported by the file.
130
O E M Spec. of DDRS-3xxxx
Bit
5 4 3
Command Code = 3Eh
Reserved = 0
Logical Block Address
Reserved = 0
Byte Transfer Length
Reserved = 0
2 1 0
CORT RelAdr
= 0 = 0
(LSB)
(LSB)
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