SMCXXXAF Datasheet, PDF (66/82 Pages) Numonyx B.V – 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte and 512 Mbyte 3.3 V / 5 V supply CompactFlash™ card

CF-ATA command description
SMCxxxAF
Table 65. Set Features
Bit
7
6
5
4
3
2
1
0
Command (7)
C/D/H (6)
X
Cyl High (5)
Cyl Low (4)
Sect Num (3)
Sect Cnt (2)
Feature (1)
EFh
Drive
X
X
X
X
Config
Feature
Table 66. Features supported
Feature
Operation
01h Enable 8 bit data transfers.
03h Set transfer mode based on value in Sector Count register.
55h Disable Read Look Ahead.
69h NOP Accepted for backward compatibility.
81h Disable 8 bit data transfer.
96h NOP accepted for backward compatibility.
97h Accepted for backward compatibility. Use of this feature is not recommended.
9Ah
Set the host current source capability. Allows trade-off between current drawn and
read/write speed.
Table 67. Transfer mode values
Mode
Bits (7:3)
PIO default mode
PIO default mode, disable
IORDY
PIO flow control transfer
mode
00000b
00000b
00001b
1. Mode = transfer mode number.
Bits (2:0)
000b
001b
Mode⁽¹⁾
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