SanDisk SDCFH-004G Product Manual - Page 43

I/O Transfer Function

Get SanDisk SDCFH-004G - ULTRA 4GB Compact Flash CF Card 30MB/s 200x Hassle Free PDF manuals and user guides
UPC - 878587001044
View all SanDisk SDCFH-004G manuals
Add to My Manuals
Save this manual to your list of manuals

Page 43 highlights

SanDisk CompactFlash Card OEM Product Manual Interface Description Pin replacement changed bit/mask values are contained in Table 3-21. Table 3-21 Pin Replacement Changed Bit/Mask Bit Values Initial Value of (C) Status 0 1 X X Written by Host "C" Bit X X 0 1 "M" Bit 0 0 1 1 Final "C" Bit 0 1 0 1 Comments Unchanged Unchanged Cleared by host Set by host 3.4.5 Socket and Copy Register (Address 206h in Attribute Memory) This register contains additional configuration information. This register is always written by the system before writing the card's Configuration Index Register. Operation D7 D6 D5 Read Reserved 0 0 Write 0 0 0 D4 Drive# Drive# (0) D3 D2 D1 D0 0 0 0 0 X X X X Bit D7 D4 D3-D0 (write) Name Reserved Drive# X Description This bit is reserved for future standardization. This bit must be set to "0" by the software when the register is written. This bit indicates the drive number of the card if twin card configuration is supported. The socket number is ignored by the card. 3.5 I/O Transfer Function The following sections provide valuable information for the I/O Transfer function. 3.5.1 Common Memory Function The Common Memory transfer to or from SanDisk CompactFlash memory cards can be either 8 or 16 bits. The card permits both 8- and 16-bit accesses to all of its Common Memory addresses. Table 3-22 Common Memory Function Function Code Standby Byte Read Access (8 bits) Byte Write Access (8 bits) -REG -CE2 -CE1 A0 -OE -WE D15-D8 X H H X X X High Z H H L L L H High Z H H L H L H High Z H H L L H L Don't Care H H L H H L Don't Care D7-D0 High Z Even Byte Odd Byte Even Byte Odd Byte © 2007 SanDisk Corporation 3-25 Rev. 12.0, 02/07

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
SanDisk CompactFlash Card OEM Product Manual
Interface Description
Pin replacement changed bit/mask values are contained in Table 3-21.
Table 3-21
Pin Replacement Changed Bit/Mask Bit Values
Written by Host
Initial Value of
(C) Status
“C” Bit
“M” Bit
Final “C” Bit
Comments
0
X
0
0
Unchanged
1
X
0
1
Unchanged
X
0
1
0
Cleared by host
X
1
1
1
Set by host
3.4.5
Socket and Copy Register (Address 206h in Attribute Memory)
This register contains additional configuration information. This register is always written by
the system before writing the card's Configuration Index Register.
Operation
D7
D6
D5
D4
D3
D2
D1
D0
Read
Reserved
0
0
Drive#
0
0
0
0
Write
0
0
0
Drive# (0)
X
X
X
X
Bit
D7
D4
D3-D0
(write)
Name
Reserved
Drive#
X
Description
This bit is reserved for future standardization. This bit must be set to "0" by
the software when the register is written.
This bit indicates the drive number of the card if twin card configuration is
supported.
The socket number is ignored by the card.
3.5
I/O Transfer Function
The following sections provide valuable information for the I/O Transfer function.
3.5.1
Common Memory Function
The Common Memory transfer to or from SanDisk CompactFlash memory cards can be either
8 or 16 bits. The card permits both 8- and 16-bit accesses to all of its Common Memory
addresses.
Table 3-22
Common Memory Function
Function Code
-REG
-CE2
-CE1
A0
-OE
-WE
D15-D8
D7-D0
Standby
X
H
H
X
X
X
High Z
High Z
Byte Read Access
H
H
L
L
L
H
High Z
Even Byte
(8 bits)
H
H
L
H
L
H
High Z
Odd Byte
Byte Write Access
H
H
L
L
H
L
Don’t Care
Even Byte
(8 bits)
H
H
L
H
H
L
Don’t Care
Odd Byte
© 2007 SanDisk Corporation
3-25
Rev. 12.0, 02/07