COM Express Interfaces
2.23.2.2. Device-Down Example
Figure 60: PCI Device Down Example; Dual UART
PICMG
®
COM Express
®
Carrier Board Design Guide Draft Rev. 2.0 / December 6, 2013 150/218
PC I_A D 0
PC I_A D 1
PC I_A D 2
PC I_A D 3
PC I_A D 4
PC I_A D 5
PC I_A D 6
PC I_A D 7
PC I_A D 8
PC I_A D 9
PC I_A D 1 0
PC I_A D 1 1
PC I_A D 1 2
PC I_A D 1 3
PC I_A D 1 4
PC I_A D 1 5
PC I_A D 1 6
PC I_A D 1 7
PC I_A D 1 8
PC I_A D 1 9
PC I_A D 2 0
PC I_A D 2 1
PC I_A D 2 2
PC I_A D 2 3
PC I_A D 2 4
PC I_A D 2 5
PC I_A D 2 6
PC I_A D 2 7
PC I_A D 2 8
PC I_A D 2 9
PC I_A D 3 0
PC I_A D 3 1
PC I_A D 2 2
V C C _5 V 0
VC C _5V 0
V C C _5 V 0
VC C _5V 0
V C C _5 V 0
C E X
P C I _ A D [0 :31]
C E X
PC I_P E R R#
C E X
PC I_P A R
C E X
PC I_S E R R#
C E X
PC I_S T O P#
C E X
PC I_T R D Y#
C E X
PC I_IR D Y #
C E X
PC I_IR Q D #
C E X
PC I_IR Q C #
C E X
PC I_F R A ME #
C E X
PC I_D E V SE L #
C E X
PC I_C /B E 0 #
C E X
PC I_C /B E 1 #
C E X
PC I_C /B E 2 #
C E X
PC I_C /B E 3 #
C E X
PC I_R E S ET #
C E X
P C I_P M E #
TX 3
D T R 3#
R T S 3#
R X 3
D S R 3#
C T S 3#
D C D 3#
R I3 #
C E X
PC I_C L K
R X 4
D S R 4#
C T S 4#
D C D 4#
R I4 #
TX 4
D T R 4#
R T S 4#
D o N o t S tu ff
M O D E 0 = 1 : S i n g le fu n ct io n c o n fig u ra tio n (n o L P T )
Do No t S t u ff
F I F O S E L = 0 : 1 6 b y te s F I F O
F I F O S E L = 1 : 1 2 8 b y te s F IF O
C 1 4 2
100 u
C 1 4 2
100 u
12
R 1 1 1 3 3 0 RR 1 1 1 3 3 0 R
R 1 0 5 10 kR 1 0 5 10 k
R 1 0 7 10 kR 1 0 7 10 k
C 1 5 3 6 8 pC153 68p
R 1 0 6 10 kR 1 0 6 10 k
C 1 4 5
100n
C 1 4 5
100n
R 1 1 2 10 kR 1 1 2 10 k
R 1 0 3 3 3 0 RR 1 0 3 3 3 0 R
C 1 4 4
100n
C 1 4 4
100n
C 1 4 8
100n
C 1 4 8
100n
R 1 0 8 10 kR 1 0 8 10 k
Y 1
1M 8 43 2
Y 1
1M 8 43 2
R 1 1 6 4 7 0 RR 1 1 6 4 7 0 R
C 1 5 1
1 0 0 n
C 1 5 1
1 0 0 n
R 1 1 7
10k
R 1 1 7
10k
R 1 0 4 10 kR 1 0 4 10 k
R10 2
10 k
R10 2
10 k
C 1 4 7
100n
C 1 4 7
100n
R 1 1 0 2 2 RR 1 1 0 2 2 R
C15 0
100n
C15 0
100n
R 1 0 9 2 2 RR 1 0 9 2 2 R
R10 1
10 k
R10 1
10 k
O X 1 6 P C I9 5 2
P C IX T A L
U A R T 0U A R T 1
P a ralle l P ort
E E P R O M
U 1 2
O X 1 6PC I95 2
O X 1 6 P C I9 5 2
P C IX T A L
U A R T 0U A R T 1
P a ralle l P ort
E E P R O M
U 1 2
O X 1 6PC I95 2
A D 0
5 2
A D 1
5 1
A D 2
5 0
A D 3
4 9
A D 4
4 8
A D 5
4 7
A D 6
4 4
A D 7
4 3
A D 8
4 1
A D 9
4 0
A D 1 0
3 9
A D 1 1
3 6
A D 1 2
3 5
A D 1 3
3 4
A D 1 4
3 3
A D 1 5
3 2
A D 1 6
1 5
A D 1 7
1 4
A D 1 8
1 3
A D 1 9
1 2
A D 2 08
A D 2 17
A D 2 26
A D 2 35
A D 2 42
A D 2 5
1 2 7
A D 2 6
1 2 6
A D 2 7
1 2 5
A D 2 8
1 2 4
A D 2 9
1 2 3
A D 3 0
1 2 2
A D 3 1
1 2 1
ID S E L4
C /B E # 0
4 2
C /B E # 1
3 1
C /B E # 2
1 6
C /B E # 33
P C I_ C L K
1 1 7
D E V S E L #
2 4
F R A M E #
1 7
IN T A #
1 1 3
IN T B #
1 1 4
IR D Y #
1 8
T R D Y #
2 3
P A R
2 8
P E R R #
2 6
S E R R #
2 7
S T O P #
2 5
P M E #
1 2 0
R S T #
1 1 5
X T L I
9 1
X T L O
9 0
G N D 19
G N D 2
1 1
G N D 3
1 9
G N D 4
2 0
G N D 5
2 2
G N D 6
2 9
G N D 7
3 7
G N D 8
4 5
G N D 9
5 3
G N D 1 0
5 4
G N D 1 1
5 7
G N D 1 2
6 1
G N D 1 3
6 7
G N D 1 4
7 6
G N D 1 5
8 2
G N D 1 6
9 2
G N D 1 7
9 3
G N D 1 8
1 0 2
G N D 1 9
1 1 2
G N D 2 0
1 1 6
G N D 2 1
1 1 9
G N D 2 2
1 2 8
V C C 1 1
V C C 2
1 0
V C C 3
2 1
V C C 4
3 0
V C C 5
3 8
V C C 6
4 6
V C C 7
5 8
V C C 8
7 7
V C C 9
8 9
V C C 1 0
1 0 3
V C C 1 1
1 1 8
F IF O S E L
8 8
T X D 0 / Ir D A _ O U T 0
1 1 1
D T R 0 # / 4 8 5 _ E N 0 / T X _ C L K _ O U T 0
1 0 9
R T S 0#
1 1 0
R X D 0 / IrD A _ IN 0
1 0 4
D S R 0 # / R x _ C L K _ IN 0
1 0 7
C T S 0#
1 0 8
D C D 0 #
1 0 6
R I0 # / T X _ C L K _ IN 0
1 0 5
T X D 1 / Ir D A _ O U T 1
1 0 1
D T R 1 # / 4 8 5 _ E N 1 / T X _ C L K _ O U T 1
9 9
R T S 1#
1 0 0
R X D 1 / IrD A _ IN 1
9 4
D S R 1 # / R x _ C L K _ IN 1
9 7
C T S 1#
9 8
D C D 1 #
9 6
R I1 # / T X _ C L K _ IN 1
9 5
P D 0
7 5
P D 1
7 4
P D 2
7 3
P D 3
7 2
P D 4
7 1
P D 5
7 0
P D 6
6 9
P D 7
6 8
P E
8 6
B U S Y / W A IT #
8 5
S L I N # / A D D R S T B #
8 1
S E L E C T
8 4
E R R O R #
8 3
IN IT #
8 0
A C K # / IN T R #
8 7
A F D # / D A T A S T B #
7 9
S T B # / W R IT E #
7 8
L O C A L _ T R A N S _ E N
6 6
E E _ C K
6 5
E E _ C S
6 4
E E _ D O
6 3
E E _ D I
6 2
T E S T
5 5
M O D E 0
5 6
M IO 0
5 9
M IO 1
6 0
R 1 1 5 10 kR 1 1 5 10 k
C 1 4 3
4.7 u
C 1 4 3
4.7 u
R 1 1 3 10 kR 1 1 3 10 k
R 1 1 4
220k
R 1 1 4
220k
Q 5
2N 7 0 0 2
Q 5
2N 7 0 0 2
1
23
C 1 5 2 2 2 pC152 22p
C 1 4 6
1 0 0 n
C 1 4 6
1 0 0 n
C1 4 9
100n
C1 4 9
100n
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