User manual
19 GR-LEON4-ITX Development Board
User Manual
2.15 SPI interface
In addition to the SPIM memory interface (ref section ), the LEON4 ASIC also provides an
SPI interface for user defined devices.
As shown in Figure 2-14 , the SPI interface pins of the LEON4 ASIC are connected to an 10
pin 0.1” header on the board to allow an external circuit SPI circuits to be hooked-up.
As an example SPI circuit, the GR-LEON4-ITX Board provides an AD7841, Temperature
monitor circuit on the board, which is selected with the SPIC_CS0 output of the ASIC.
© Aeroflex Gaisler AB August 2010, Rev. 0.3
Figure 2-13: I2C Interface Configuration
X 1
1
X 2
2
V B
3
G N D
4
S D A
5
S C L
6
R S T
7
V C C
8
U 1 5
D S 1 6 7 2
+ 3 V 3
D G N D
1
2 3
4
Y 1
3 2 . 7 6 8 k
I 2 C M 0 _ S C L
I 2 C M 0 _ S D A
I 2 C M 1 _ S C L
I 2 C M 1 _ S D A
I 2 C S _ S C L
I 2 C S _ S D A
I 2 C M 0
S C L
S D A
I 2 C
I 2 C M 1
I 2 C S
S C L
S D A
I 2 C
S C L
S D A
I 2 C
T P 6
R 2 4
1 0 k
R 2 3
1 0 k
+ 3 V 3
C 7 5
1 0 0 n
+ 3 V 3D G N D
R 2 6
1 0 k
R 2 5
1 0 k
+ 3 V 3
R 2 8
1 0 k
R 2 7
1 0 k
+ 3 V 3
1 2
3 4
J 1 8
H D R 2 X 2
1 2
3 4
J 1 7
H D R 2 X 2
+ 3 V 3
D G N D
+ 3 V 3
D G N D
D G N D
+
C 7 6
0 . 4 7 F
S U P E R C A P
I 2 C R e a l T i m e C l o c k c h i p w i t h p o w e r b a c k u p
H e a d e r f o r e x t e r n a l I 2 C f u n c t i o n s
12
34
J P 1 0
12
34
J P 9
H e a d e r f o r e x t e r n a l I 2 C f u n c t i o n s
I n s t a l l j u m p e r s 1 - 2 a n d 3 - 4 t o p r o v i d e p u l l u p s o n I 2 C s i g n a l s
I n s t a l l j u m p e r s 1 - 2 a n d 3 - 4 t o p r o v i d e p u l l u p s o n I 2 C s i g n a l s