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208 Fibre Channel Interface Manual, Rev. D
Field definitions (listed alphabetically)
Block Descriptor Length
The length (in bytes) of the Block Descriptor. It is equal to the number of bytes in the Block Descriptor (either 0 or 8) and
does not include the page headers and mode parameters.
0 No block descriptors are included in the parameter list. This condition is not considered an error.
Block Length
The length (in number of bytes) for each logical block described by the Block Descriptor. Set to desired sector size before a
Format. Valid values are even numbered sizes from 180 (B4h) to 4,096 (1000h). Not all drives can format down to 180;
some have a minimum of 256. A typical block length value is 512 (200h).
Density Code
Must be 00h to define the default density of the medium.
Note. For drives with capacities over 5 Gbytes, this byte is used for the Most Significant Byte (MSB) of the Number of
Blocks field.
Medium Type
00h Define the default type direct access device.
Table 139: Mode Select (6) parameter list
Bit
Byte
76543210
000000000
Reserved
100000000
Medium Type
200000000
Reserved
3
Block Descriptor Length Either 00h or 08h
Block descriptor
000000000
Density Code
100000000
Number of Blocks (MSB)
200000000
Number of Blocks
300000000
Number of Blocks (LSB)
400000000
5
Block Length (MSB)
6
Block Length
7
Block Length (LSB)
Parameter information
0–n
Mode Select Page Headers And Their Parameters (see tables 140 and 145)
Table
number
139
139
139
139