SanDisk SDCFH-004G Product Manual - Page 68

Idle Immediate-95H, E1H, Initialize Drive Parameters-91H

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ATA Command Description SanDisk CompactFlash Card OEM Product Manual 5.1.7 Idle Immediate-95H, E1H This command causes the card to set BSY, enter the Idle (Read) mode, clear BSY and generate an interrupt. Table 5-14 Idle Immediate Bit 7 6 5 4 3 2 1 0 Command (7) E1H or 95H C/D/H (6) X Drive X Cyl High (5) X Cyl Low (4) X Sec Num (3) X Sec Cnt (2) X Feature (1) X 5.1.8 Initialize Drive Parameters-91H This command enables the host to set the number of sectors per track and the number of heads per cylinder. Only the Sector Count and the Card/Drive/Head registers are used by this command. NOTE: SanDisk recommends not using this command in any system because DOS determines the offset to the Boot Record based on the number of heads and sectors per track. If a CompactFlash Memory Card is "Formatted" with one head and sector per track value, the same card will not operate correctly with DOS configured with another heads and sectors per track value. Table 5-15 Initialize Drive Parameters Bit Command (7) C/D/H (6) Cyl High (5) Cyl Low (4) Sec Num (3) Sec Cnt (2) Feature (1) 7 6 5 4 3 2 1 0 91H X 0 X Drive Max. Head (no. of heads - 1) X X X Number of Sectors X 02/07, Rev. 12.0 5-14 © 2007 SanDisk Corporation

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ATA Command Description
SanDisk CompactFlash Card OEM Product Manual
5.1.7
Idle Immediate–95H, E1H
This command causes the card to set BSY, enter the Idle (Read) mode, clear BSY and generate
an interrupt.
Table 5-14
Idle Immediate
Bit
7
6
5
4
3
2
1
0
Command (7)
E1H or 95H
C/D/H (6)
X
Drive
X
Cyl High (5)
X
Cyl Low (4)
X
Sec Num (3)
X
Sec Cnt (2)
X
Feature (1)
X
5.1.8
Initialize Drive Parameters–91H
This command enables the host to set the number of sectors per track and the number of heads
per cylinder. Only the Sector Count and the Card/Drive/Head registers are used by this
command.
NOTE
:
SanDisk recommends not using this command in any system because
DOS determines the offset to the Boot Record based on the number
of heads and sectors per track. If a CompactFlash Memory Card is
"Formatted" with one head and sector per track value, the same card
will not operate correctly with DOS configured with another heads
and sectors per track value.
Table 5-15
Initialize Drive Parameters
Bit
7
6
5
4
3
2
1
0
Command (7)
91H
C/D/H (6)
X
0
X
Drive
Max. Head (no. of heads - 1)
Cyl High (5)
X
Cyl Low (4)
X
Sec Num (3)
X
Sec Cnt (2)
Number of Sectors
Feature (1)
X
02/07, Rev. 12.0
5-14
© 2007 SanDisk Corporation