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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 set max address can be locked/unlocked and secured by password with following features:
Table 83: Set max features
Feature register
00h
01h
02h
03h
04h
05-FFh
Command
Obsolete
SET MAX SET PASSWORD
SET MAX LOCK
SET MAX UNLOCK
SET MAX FREEZE LOCK
Reserved
Typical use of the Set max address (F9h) and Read native max address (F8h) commands would be:
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.
10.22 Set Multiple Mode (C6h)
This command enables the Card 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 Card 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 84 defines the Set Multiple Mode command Byte sequence.
Table 84: Set Multiple Mode
Task File Register
7
6
5
4
3
2
1
0
COMMAND
C6h
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
Sector Count
nu
nu
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.51
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-300_data_sheet_CF-HxBK_Rev151.doc
Page 77 of 99
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