Manual
Introduction to Cactus Technologies Industrial
Grade CF -3XX/-3XX-P1/-3XX-WP1 Series Products
01
220 Series Commercial Grade CF Product Manual v2.0Cactus Technologies
®
25
The CompactFlash Memory Card can be congured as a high performance I/O device through the
following ways:
• Standard PC-AT disk I/O address spaces 1F0h-1F7h, 3F6h-3F7h (primary); 170h-177h, 376h-377h
(secondary) with IRQ 14 (or other available IRQ).
• Any system decoded 16-byte I/O block using any available IRQ.
• Memory space.
The communication to or from the CompactFlash Memory Card is done using the Task File registers,
which provide all the necessary registers for control and status information. The PC Card interface
connects peripherals to the host using four register mapping methods. Table 4-19 is a detailed
description of these methods.
I/O Primary and Secondary Address Congurations
4.1.
Table 4-19. I/O Congurations
Table 4-20. Primary and Secondary I/O Decoding
Standard Congurations
Cong Index IO or Memory Address Drive # Description
0 Memory 0-F, 400-7FF 0 Memory Mapped
1 I/O XX0-XXF 0 I/O Mapped 16 Contiguous Registers
2 I/O 1F0-1F7, 3F6-3F7 0 Primary I/O Mapped Drive 0
2 I/O 1F0-1F7, 3F6-3F7 1 Primary I/O Mapped Drive 1
3 I/O 170-177, 376-377 0 Secondary I/O Mapped Drive 0
3 I/O 170-177, 376-377 1 Secondary I/O Mapped Drive 1
-REG A9-A4 A3 A2 A1 A0 -IORD=0 -IOWR=0 Note
0 1F(17) 0 0 0 0 Even RD Data Even WR Data 1, 2
0 1F(17) 0 0 0 1 Error Register Features 1
0 1F(17) 0 0 1 0 Sector Count Sector Count
0 1F(17) 0 0 1 1 Sector No. Sector No.
0 1F(17) 0 1 0 0 Cylinder Low Cylinder Low
0 1F(17) 0 1 0 1 Cylinder High Cylinder High
0 1F(17) 0 1 1 0 Select Card/Head Select Card/Head
0 1F(17) 0 1 1 1 Status Command
0 3F(37) 0 1 1 0 Alt Status Device Control
0 3F(37) 0 1 1 1 Drive Address Reserved
ATA Drive Register Set
Denition and Protocol04