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EE-196 데이터시트(HTML) 2 Page - Analog Devices

부품명 EE-196
상세내용  ADSP-BF535 Blackfin® EZ-KIT Lite™ CompactFlash® Interface
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EE-196 데이터시트(HTML) 2 Page - Analog Devices

 
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The EBIU is clocked by the system clock
(SCLK) of the ADSP-BF535 Blackfin processor.
On the ADSP-BF535 Blackfin EZ-KIT Lite,
SCLK is set to 120MHz, which will be more
than sufficient for accesses to CompactFlash
cards.
Read/Write
access
times
on
CompactFlash cards are defined between 250ns –
300ns (~ 3 – 4 MHz).
To find interface/bus
timing, please refer to the CF/CF+ standard.
CompactFlash cards function in three basic
modes:
• PC Card ATA using Common Memory Mode.
• PC Card ATA using I/O Mode.
• True IDE Mode.
This EE-Note will only deal with 16 bit transfers
using Common Memory Mode.
ADSP-BF535 CompactFlash Interface Pin
Mapping
Figure 3: CF Interface Pin Mapping
Figure 3 shows the main pin-to-pin connections
between the ADSP-BF535 and the CompactFlash
card.
CompactFlash Signal Descriptions – Common
Memory Mode
• A[10:1]: Address Lines
• D[15:0]: Data Lines
• /WE (Write Enable): This signal is driven by
the ADSP-BF535 and used for strobing
memory write data to the registers of the
CompactFlash.
• /OE (Output Enable): This strobe is generated
by the ADSP-BF535 and used to read data
from the CompactFlash.
• REG (Attribute Memory Select): This signal
is to distinguish between Common Memory
and Register (Attribute) Memory accesses.
High for Common Memory, Low for Attribute
Memory.
• /CE1, /CE2 (Card Enable): These signals are
used both to select the card and to indicate to
the card whether a byte or a word operation is
being performed. Since both of these signals
are tied to AMS[1] of the ADSP-BF535, we
will be doing word (16-bit) accesses only.
ADSP-BF535
Vcc
CompactFlash
10 kOhm
• /CD1 (Card Detect): This signal is used by
the ADSP-BF535 to determine that the
CompactFlash is fully inserted into its socket.
PF8
CD1
AOE
OE
• A[0]: Address line 0 is connected to ground
since this interface supports word accesses
only.
AWE
WE
AMS[1]
CE2
A[11]
REG
Software Implementation
A[10:2]
Address Bus
A[10:2]
Since we are using the CompactFlash as a PC
card ATA using memory mode, it will be seen by
the ADSP-BF535 as a standard ATA disk drive.
The following gives a brief explanation of the
file system used on standard disk drives.
A[1]
ABE[3] / A[1]
A[0]
GND
D[15:0]
D[15:0]
Data Bus
FAT file system
Standard
disk
drives
use
the
FAT
(File
Allocation Table) file system.
Currently there
are three types of FAT file systems:
FAT12,
FAT16, and FAT32. In a FATnn file system, nn
ADSP-BF535 Blackfin® EZ-KIT Lite™ CompactFlash® Interface (EE-196)
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