5.3 Host Commands
C141-E104-02EN 5-45
Word 47
Bit 7-0 = 10:
Word 59 = 0000:
= 01xx:
Maximum number of sectors that can be transferred per interrupt
by the READ MULTIPLE and WRITE MULTIPLE commands.
The READ MULTIPLE and WRITE MULTIPLE commands are
disabled.
The READ MULTIPLE and WRITE MULTIPLE commands are
enabled. “xx” indicates the current setting for number of sectors
that can be transferred per interrupt by the READ MULTIPLE and
WRITE MULTIPLE commands.
e.g. 0110 = Block count of 16 has been set by the SET
MULTIPLE MODE command.
(16) SET MAX (F9)
Each SET MAX command is determined by the Features Register value.
SET MAX Features Register Values
Value Command
00h Obsolete
01h SET MAX SET PASSWORD
02h SET MAX LOCK
03h SET MAX UNLOCK
04h SET MAX FREEZE LOCK
05h - FFh Reserved
• SET MAX ADDRESS
This command allows the maximum address accessible by the user to be set in
LBA or CHS mode. Upon receipt of the command, the device sets the BSY bit
and saves the maximum address specified in the DH, CH, CL and SN registers.
Then, it clears BSY and generates an interrupt.
The new address information set by this command is reflected in Words 1, 54, 57,
58, 60 and 61 of IDENTIFY DEVICE information. If an attempt is made to
perform a read or write operation for an address beyond the new address space, an
ID Not Found error will result.
When SC register bit 0, VV (Value Volatile), is 1, the value set by this command
is held even after power on and the occurrence of a hard reset. When the VV bit is
0, the value set by this command becomes invalid when the power is turned on or
a hard reset occurs, and the maximum address returns to the value (default value if
not set) most lately set when VV bit = 1.