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On reset
BIOS receives control after a system reset;
1.
2.
BIOS issues a READ NATIVE MAX ADDRESS command to find the max capacity of the device;
BIOS issues a SET MAX ADDRESS command to the values returned by READ NATIVE MAX ADDRESS;
3. BIOS reads configuration data from the highest area on the disk;
4. BIOS issues a READ NATIVE MAX ADDRESS command followed by a SET MAX ADDRESS command to reset the
device to the size of the file system.
On save to disk
1.
2.
BIOS receives control prior to shut down;
BIOS issues a READ NATIVE MAX ADDRESS command to find the max capacity of the device;
3. BIOS issues a volatile SET MAX ADDRESS command to the values returned by READ NATIVE MAX ADDRESS;
4. Memory is copied to the reserved area;
5. Shut down completes;
6. On power-on or hardware reset the device max address returns to the last non-volatile setting.
These commands are intended for use only by system BIOS or other low-level boot time process.
Using these commands outside BIOS controlled boot or shutdown may result in damage to file systems on the
device. Devices should return command aborted if a subsequent non-volatile SET MAX ADDRESS command is
received after a power-on or hardware reset.
6.34 Set max address Ext (37h) 48bit LBA
The Set Max Address Ext command sets the max address of the drive in 48bit LBA mode. It is related to the Host
protected Area feature set and 48bit feature set. Table 55 defines the Set max address command Byte sequence.
Table 57: Read nativ e max address
register write
previous
current
Task File Register
15:8
7
6
5
4
3
2
1
0
COMMAND
-
37h
DRIVE/HEAD
-
1
1
1
Drive
Reserved
LBA High
LBA Mid
LBA Low
LBA (47:40)
LBA (39:32)
LBA (31:24)
LBA (23:16)
LBA (15:8)
LBA (7:0)
SECTOR COUNT
FEATURES
nu
nu
nu
nu
VV
The LBA bit shall be set to one to specify the address is an LBA. DEV shall specify the selected device.
Prerequisites
DRDY set to one. A successful READ NATIVE MAX ADDRESS command shall immediately precede a SET MAX ADDRESS
command.
VV =Value volatile. If bit 0 is set to one, the device shall preserve the maximum values over power-up or
hardware reset. If bit 0 is cleared to zero, the device shall revert to the most recent nonvolatile maximum
address value setting over power-up or hardware reset.
The output is the same as for Readout Native max address Ext (see Table 35).
6.35 Set Multiple Mode (C6h)
This command enables the Drive to perform Read and Write Multiple operations and establishes the block count
for these commands. The Sector Count Register is loaded with the number of sectors per block. Upon receipt of
the command, the Drive sets BSY and checks the Sector Count Register.
If the Sector Count Register contains a valid value and the block count is supported, the value is loaded for all
subsequent Read Multiple and Write Multiple commands and execution is enabled. If a block count is not
supported, an Aborted Command error is posted, and Read Multiple and Write Multiple commands are disabled.
If the Sector Count Register contains ‘0’ when the command is issued, Read and Write Multiple commands are
disabled. At power on the default mode is Read and Write Multiple disabled, unless it is disabled by a Set
Feature command. Table 58 defines the Set Multiple Mode command Byte sequence.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 0.92
CH-9552 Bronschhofen
Switzerland
F-240_data_sheet_CA-HxBV_Rev092.doc
Page 37 of 56
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