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EE-196 데이터시트(HTML) 5 Page - Analog Devices

부품명 EE-196
상세내용  ADSP-BF535 Blackfin® EZ-KIT Lite™ CompactFlash® Interface
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EE-196 데이터시트(HTML) 5 Page - Analog Devices

 
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Long file names are not supported in this
software interface.
For FAT12 and FAT16 file systems, the root
directory immediately follows the last FAT and
has a fixed location and fixed size on the disk.
The first sector of the Root Directory is
computed as:
FirstRootDirSec = ReservedSectors + (FATCount *
SectorsPerFAT)
For FAT32 file systems, the root directory can be
of variable size and is a cluster chain.
Software Accesses to the CompactFlash
In Common Memory Mode, accesses to the
CompactFlash are done through a set of memory-
mapped registers. The following lists them out
(last two columns of Table 5) as well as the state
of the pins required to access them:
Table 5. Memory Mapped Decoding
PLEASE NOTE – Since we have A[0] tied to ground, we can only do 16-bit accesses to the
CompactFlash with this interface.
Detailed information of these registers can be
found in the CF and CF+ standard.
The ADSP-BF535 is connected to the CF via
Asynchronous Bank 1 (ASYNC Bank 1) of the
External Bus Interface Unit (EBIU). The starting
location of ASYNC Bank 1 is memory mapped
to address 0x2400 0000 and uses AMS[1] as the
memory bank select line.
From Table 5, we can see that each read/write
access on the ADSP-BF535 will affect two CF
registers. For example, the following piece of
code shows how to set up the Cylinder registers
Blackfin External
Memory Address
ASM[1]
[ CE2 ] [ CE1 ]
A[11]
[ REG ]
A[10]
A[9:4]
A[3:0]
(HEX)
AOE [ OE ] = 0
ATA Read Register
AWE [ WE ] = 0
ATA Write Register
0x2400 0800
D[7:0]
0
0
1
0
XX
0
Even RD Data
Even WR Data
0x2400 0800
D[15:8]
0
0
1
0
XX
0
Error
Feature
0x2400 0802
D[7:0]
0
0
1
0
XX
2
Sector Count
Sector Count
0x2400 0802
D[15:8]
0
0
1
0
XX
2
Sector Number
Sector Number
0x2400 0804
D[7:0]
0
0
1
0
XX
4
Cylinder Low
Cylinder Low
0x2400 0804
D[15:8]
0
0
1
0
XX
4
Cylinder High
Cylinder High
0x2400 0806
D[7:0]
0
0
1
0
XX
6
Select Card / Head
Select Card / Head
0x2400 0806
D[15:8]
0
0
1
0
XX
6
Status
Command
0x2400 0808
D[7:0]
0
0
1
0
XX
8
Dup. Even RD Data
Dup. Even WR Data
0x2400 0808
D[15:8]
0
0
1
0
XX
8
Dup. Odd RD Data
Dup. Odd WR Data
0x2400 080C
D[15:8]
0
0
1
0
XX
C
Dup. Error
Dup. Features
0x2400 080E
D[7:0]
0
0
1
0
XX
E
Alt. Status
Device Control
0x2400 080E
D[15:8]
0
0
1
0
XX
E
Drive Address
Reserved
0x2400 0C08
D[7:0]
0
0
1
1
XX
8
Even RD Data
Even WR Data
0x2400 0C08
D[15:8]
0
0
1
1
XX
8
Odd RD Data
Odd WR Data
ADSP-BF535 Blackfin® EZ-KIT Lite™ CompactFlash® Interface (EE-196)
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