Phytec phyCORE-PXA255, Руководство по оборудованию

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Development Board for phyCORE-PXA255
36 
PHYTEC Meßtechnik GmbH 2004 L-657e_0
5.3.2 Compact Flash Interface
The PXA255 controller supports two PCMCIA interfaces. The second
interface is used on the Development Board as a CompactFlash
socket. PLD U7 provides all the control logic to operate the
CompactFlash interface. The connector is located on the
corresponding Expansion Board.
U S B
O T G
M u l t i M e d i a C a r d
C o m p a c t F l a s h - C a r d
D 5 D 4
D 2 D 1
T a s t e r R e s e t
G P I O - T a s t e r
D 3 S o u n d
Figure 16: Compact Flash Interface on the Expansion Board
The CompactFlash card is operated in TrueIDE mode. The interface is
decoupled from the buffered data and address bus on the
Development Board with 74LVC245 line driver ICs.
P C M C I A - C o n t r o l
U 7
C o m p a c t
F l a s h
A 0 - 2 5
D 0 - 1 5
C o n t r o l
X D 0 - 1 5
X A 0 - 1 0
C o n t r o l
F r o n t p l a t i n e B a s i s p l a t i n e
F l a s h 3 2 - b i t
D 0 - D 1 5
V C C _ C O R E
U 1 0
D 0 - D 1 5
U 1 3
S D R A M
B a n k 0
D 1 6 - D 3 1
U 1 5
S D R A M
B a n k 0
F l a s h 3 2 - b i t
D 1 6 - D 3 1
U 1 2
U 5
P X A 2 5 5
X 1
M M C - C a r d
3 2 k H z
U 2 0
R T C
U 2
E G P I O
U 1 9
C A N
U 3
U S B
Figure 17: Compact Flash Circuitry
Caution!
The CompactFlash connector can only be operated at 3.3 V when
using the Development Board with PCB revision 1220.1.