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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.
6.24 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 48 defines the Set Multiple Mode command Byte sequence.
Table 48: 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: 1.41
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
F-100_data_sheet_CA-HxBR_Rev141.doc
Page 32 of 51
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