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4-22 C156-E224-01EN
4.3.5 MODE SENSE command
Table 4.31 MODE SENSE command
Bit
Byte
76543210
0 Operation Code (1Ah)
1 Reserved DBD Reserved
2 PC Page Code
3 Reserved
4 Allocation Length
5 Reserved
The MODE SENSE command transfers a mode parameter list to INIT.
If Disable Block Descriptor (DBD) is 1, the command does not return a block
descriptor. If DBD is 0, the command returns a block descriptor.
Allocation Length specifies the number of bytes of the mode parameter to be
transferred. If Allocation Length is 0, the command ends normally without
transferring any data.
Page Control (PC) specifies the type of page to be sent.
Table 4.32 Page control field
Bit 7 Bit 6 Parameter type
0 0 Current value
0 1 Variable value
1 0 Default value
1 1 Saved value
Page Code specifies a mode page to be transferred. If Page Code is 3Fh, all mode
pages are transferred. Table 4.10, "Mode page codes" lists the mode pages that are
supported.
Mode pages are transferred in ascending order of page code.
If 0 is specified for both Page Code and Page Control, the command transfers
Mode Parameter Header and Block Descriptor (only if the DBD bit is 0).
Table 4.33 is a list of mode parameters.