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Table 86: Identifier and Security Level Bit Interaction
Identifier Level
Command result
User
User
Master
High
Maximum
High or
Maximum
The password supplied with the command shall be saved as the new User password. The lock mode
shall be enabled from the next power-on or hardware reset. The CF card shall then be unlocked by
either the User password or the previously set Master password.
The password supplied with the command shall be saved as the new User password. The lock mode
shall be enabled from the next power-on or hardware reset. The CF card shall then be unlocked by
only the User password.
The Master password previously set is still stored in the CF card shall not be used to unlock the CF
card.
This combination shall set a Master password but shall not enable or disable the Lock mode. The
security level is not changed.
10.25 Security Unlock (F2h)
This command requests transfer of a single sector of data from the host. Table 80 defines the content of this
sector of information. If the identifier bit is set to Master and the device is in high security level, then the
password supplied shall be compared with the stored Master password. If the device is in the maximum security
level, then the unlock command shall be rejected. If the identifier bit is set to user, then the device compares the
supplied password with the stored User password. If the password compare fails then the device returns
command aborted to the host and decrements the unlock counter. This counter is initially set to five and is
decremented for each password mismatch when Security Unlock is issued and the device is locked. Once this
counter reaches zero, the Security Unlock and Security Erase Unit commands are command aborted until after a
power-on reset or a hardware reset is received. Security Unlock commands issued when the device is unlocked
have no effect on the unlock counter.
Table 87: Security Unlock
Task File Register
7
6
5
4
3
2
1
0
COMMAND
F2h
DRIVE/HEAD
1
LBA
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
10.26 Set Features (Efh)
Table 88: Set Features
nu
nu
nu
nu
nu
Task File Register
7
6
5
4
3
2
1
0
COMMAND
Efh
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
Config
Feature
nu
Table 89: Features Supported
Feature
01h/81h
02h/82h
03h
Operation
Enable/Disable 8-bit data transfers.
Enable/Disable write cache.
Set transfer mode based on value in Sector Count register.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.20
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-320_data_sheet_CF-HxBO_Rev120.doc
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