SanDisk CompactFlash - ATA Drive Register Set and Protocol

CompactFlash Memory Card Product Manual
SanDisk CompactFlash Memory Card Product Manual © 1998 SANDISK CORPORATION46
5.0 ATA Drive Register Set Definition and Protocol
The CompactFlash Memory Card can be
configured as a high performance I/O device
through:
a.) 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).
b.) Any system decoded 16 byte I/O block
using any available IRQ.
c.) 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 PCMCIA
interface connects peripherals to the host using
four register mapping methods. The following is a
detailed description of these methods:
Table 5-1 I/O Configurations
Standard Configurations
Config
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