Service manual
Schematic Diagrams
PCIE Card Reader/LAN JMC251 B - 31
B.Schematic Diagrams
PCIE Card Reader/LAN JMC251
Sheet 30 of 52
PCIE Card Reader/
LAN JMC251
R447
75_1%_04
SD_CLK
C293
10u_10V_X5R_08
C279
0.1u_16V_Y5V_04
R232 1M_04
C768
0.1u_16V_Y5V_04
Z2903
L28
*WCM2012F2S-161T03-SHORT
1
4
2
3
SD_D1
SD_BS
MS _I N S#
SD_CLK
SD_D0
VCC_CARD
SD_CD#
SD_D3
J_CR1
88025-200L
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
SD_D2
SD_WP
L29
*WCM2012F2S-161T03-SHORT
1
4
2
3
L30
*WCM2012F2S-161T03-SHORT
1
4
2
3
L31
*WCM2012F2S-161T03-SHORT
1
4
2
3
PCIE_C LK_JMB# 19
PCIE_C LK_JMB 19
3VS
3V3V
3V
3V
LAN_MDIN4
D03
LAN_MDIP3
3V
3V
3V
3V
MD IO14
MS_ IN S#
MD IO12
MD IO7
3V
3V
3VS
3V
S1
SHORT_1MM
21
CR1_PCTLN
30 mil
30 mil
MX3-
MX4+
MX1+
MX2+
MX2-
MX1-
MX4-
MX3+
LAN_MDIN1
LMX2-
LAN_MDIN3
CLOSE TO TRANSFORMER
LAN_MDIP1
SD_CD#
L35
LFE9219C-R
TCT1
1
TD1+
2
TD1-
3
TCT2
4
TD2+
5
TD2-
6
TCT3
7
TD3+
8
TD3-
9
TCT4
10
TD4+
11
TD4-
12
MX4-
13
MX4+
14
MC T4
15
MX3-
16
MX3+
17
MC T3
18
MX2-
19
MX2+
20
MC T2
21
MX1-
22
MX1+
23
MC T1
24
LAN_MDIN2
Z2908
LMX3-
3V6,12,13,15..17,20,21,25,28,29,34,35,37..41
3VS7..9,12,13,15..28,31..34,36,37,40,41
Z2905
Z2909
Z2901
LAN_LED2
CR1_LEDN
Z2904
Z2906
Z2907
LAN_MDIP4
.
L61
SWF2520CF-4R7M-M
LANXOUT
R446
75_1%_04
R444
75_1%_04
R445
75_1%_04
R5 61 * 200K_04
Z2912
Z2913
C263
0.1u_16V_Y5V_04
C100DB-10805_L
J_RJ45
DD-
8
DD+
7
DB-
6
DC-
5
DC+
4
DB+
3
DA-
2
DA+
1
shield
GND1
shield
GND2
C269
10u_10V_X5R_08
C305
22p_50V_NPO_04
C742
0.1u_16V_Y5V_04
C880
0.1u_16V_Y5V_04
C261
0.1u_16V_Y5V_04
R257 75_1%_04
C765 *0.1u_16V_Y5V_04
BUF_PLT_RST# 15,29,31,34
R560 0_04
X1 25MHz
12
C879
4.7u_25V_X5R_08
R537
12K_1%_04
R565 *0_04
C277
10u_10V_X5R_08
C280
22p_50V_NPO_04
RN6
8P4RX4.7K_04
1
2
3
4 5
6
7
8
R563 0_04
R5 62 10K_04
C262
0.1u_16V_Y5V_04
R564 *100K_04
R221 22_04
C295
0.1u_16V_Y5V_04
C753 0.1u_10V_X7R_04
Pin#38
Pin#62
C299
10u_6.3V_X5R_08
Pin#59
NC
NC
RN5
8P4RX10K_04
1
2
3
45
6
7
8
C566
C766
0.1u_16V_Y5V_04
Pin#7
C761 0.1u_10V_X7R_04
C770
0.1u_16V_Y5V_04
C289
0.1u_16V_Y5V_04
Pin#51
0
PCIe Differential
Pairs = 100 Ohm
MDIO Single
End = 50
Ohm
C767
0.1u_16V_Y5V_04
Function
R2 41 * 200K_04
C459
*10p_50V_NPO_04
C769
0.1u_16V_Y5V_04
For JMC251/261
only
7mm X 7mm
NC
Pin#26
(LQFP 64)
JMC251
JMC261
U41
JMC251
REXT
1
VDDX33
2
XIN
3
XOUT
4
GND
5
LX
6
FB12
7
VDDREG
8
CLKN
9
CLKP
10
AVDDH
11
RXP
12
GND
14
TXN
15
TXP
16
AVDDX
17
RSTN
18
WAKEN
19
MPD
20
CREQN
21
SMB_SCL/LED2
22
CR_CD1N
23
CR_CD0N
24
RXN
13
MDIO8
37
VDDIO
38
MDIO7
39
MDIO6
40
GND
41
MDIO5
42
MDIO4
43
MDIO3
44
VDDIO
45
MDIO2
46
MDIO1
47
MDIO0
48
MDIO9
36
MDIO10
35
MDIO11
34
MDIO12
33
GND
32
MD IO13
31
MD IO14
30
SMB_SD A/C R_LEDN
29
TE ST N
28
VDDIO
27
VDD
26
VCC3O
25
LED0
49
LED1
50
VDD
51
GND
52
VIP_1
53
VIN_1
54
AVDD12
55
VIP_2
56
VIN_2
57
GND
58
AVDD33
59
VIP_3(NC)
60
VIN_3(NC)
61
AVDD12(NC)
62
VIP_4(NC)
63
VIN_4(NC)
64
NC
Pin#55
Enable D3E(2)
C264
0.1u_16V_Y5V_04
JMC261--PN: 6-03-00261-0P2
R2 27 * 10K_04
(>20mil)
DVDD
(>20mil)
Place all capacitors closed to chip.
The subscript in each CAP incicates the pin
number of JMC251/JMC261 that should be
closed to.
NC
0
VCC_CARD
DVDD
DVDD
REGLX
DVDD
SD_D0
SD_D1
SD_D2
MD IO1 3
SD_CD#
MS_I N S#
DVDD
SD_CLK
VCC_CARD
ARF B12
LMX1+
LMX3+
LMX4-
LMX4+
DVDD
LAN_LED1
Z2911
LAN_LED0
LMX2+
LMX1-
LAN_MDIP1
LAN_MDIP2
LAN_MDIN1
LAN_MDIN3
LAN_MDIN2
DVDD
LAN_MDIN4
LAN_MDIP3
LAN_MDIP4
Pin#8
JMC251--PN: 6-03-00251-0P0
3V
3VSZ2910
XR ST N
Pin#2
VCC_CARD
R432
Disable D3E
VCC_CARD
JMC251 GIGA LAN
R178
SD_D3
NC
SD_WP
MDIO8
SD_BS
MDIO7
Card Reader
Power
DVDD
MDIO12
MDIO10
MDIO9
MDIO11
Pin#55
100K
Enable D3E(1)
LAN_CLKREQ#
LAN_LED2
Card Reader Pull
High/Low
Resistors
MD IO13
CR1_PCTLN
MD IO14
CR1_LEDN
Pin#59
REGLX
ARFB12
LANXOUT
LANXIN
MX4-
MX2-
MX1-
0.1u
MX4+
MX1+
MX2+
MX3-
MX3+
1. For JMC251/JMC261 only.
2. MPD connect to Main Power or
RSTN for D3E applicaion, to AUX
power otherwise.
Pin#7
NC
NC
Pin#11
Near Cardreader CONN
R188
Pin#27
Switching Regulator
Pin#8
For JMC251/261
only
LMX4+
LMX4-
LMX1-
LMX3+
LMX2-
LMX2+
LMX1+
LMX3-
C131
1000p_2KV_X7R_12_H125
Z2914
SD_BS
SD_WP
PE4_TX_JMB# 15
PE4_TX_JMB 15
PE4_RX_JMB# 15
PE4_RX_JMB 15
LAN_MDIP2
C699
0.01u_16V_X7R_04
Z2902
C696
0.01u_16V_X7R_04
Layout note:
Place under the common
choke body and same as
PHY layout requirment
C697
0.01u_16V_X7R_04
C698
0.01u_16V_X7R_04
LANXIN
PE_WAKE# 16,29, 34