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7.1.2.1 Secure Digital/Multimedia Card Socket Connector
For SD/MMC applications, a Yamaichi FPS009-2203-10 or equivalent is recommended. If a
socket connector other than the recommended Yamaichi is desired, then care must be taken to
ensure that the chosen socket connector has built-in support for the write-protect (SD_WP) pin.
If one without the SD_WP support is chosen, then the SD/MMC write-protection is not functional.
In addition, 0.01-µF and 10-µF capacitors placed close to the connector are recommended to
eliminate any noise on the SD/MMC electrical interface. Due to variations on layout constraints,
series resistors are placed on the interface between the PCIXX20 controller and the SD/MMC
socket connector in case signal integrity tuning is required. A series resistor on SD_CLK is
required due to the internal feedback circuitry of the controller; series resistors on other
SD/MMC signals are recommended but not required. These tuning series resistors must be
placed as close to the socket connector as possible. Trace lengths on all SD/MMC interface
signals must be kept similar to each other to minimize the difference in propagation delay and
capacitance.
SD_DAT3
SD_CMD
SD_CLK
SD_DAT0
SD_DAT1
SD_DAT2
MC_CD_0#
SD_WP
Figure 10. SD/MMC Socket Connector Implementation
Table 9.
SD/MMC Terminals
Name
MC_CD_0
SD_CLK
SD_CMD
SD_DAT0
SD_DAT1
SD_DAT2
SD_DAT3
SD_WP
MC_PWR_CTRL_0
VCC_SD/MMC
SD_SKT_DAT3
R2
0
SD_SKT_CMD
R3
0
SD_SKT_CLK
R4
0
SD_SKT_DAT0
R5
0
SD_SKT_DAT1
R6
0
SD_SKT_DAT2
R7
0
SKT_MC_CD_0#
R8
0
SD_WP
R9
0
PCI7620/PCI7420/PCI6620/PCI6420 Implementation Guide
GHK Terminals
E02
H01
H02
H03
J07
J01
J02
J03
F01
Place close to socket
VCC_SD/MMC
CN1
1
DAT3
2
CMD
3
13
VSS1
GND
4
14
VDD
GND
5
CLK
6
VSS2
7
DAT0
8
DAT1
9
15
DAT2
GND
10
16
CD
GND
11
COMMON
12
SD_WP
SD_CONNECTOR
SCPU019
C38
C37
10uF
.01uF
23
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