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AN11001

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© NXP B.V. 2011. All rights reserved.

Application note

Rev. 1 — 7 March 2011

14 of 17

NXP Semiconductors

AN11001

CBTL02042A switching application for mSATA, PCIe Mini-Card

Circuits in

show automatic hardware selecting the SEL pins on the

multiplexers utilizing an AND gate and an inverter, or a single 74LVC1G98. Logic is based
on pin 43 and pin 21 on the Mini-Card/mSATA connector. This detection logic can also be
implemented using a GPIO output from a processor based on the CARD_DET and SEL
signal status. However, this is beyond the scope of this design guideline, and will not be
discussed here.

To simplify the circuit diagrams, XSD pins on the multiplexers are also permanently tied to
ground disabling device shutdown function. One can utilize pin 21 on Mini-Card connector
and S1 or S7 pin on the SATA HDD connector to implement this shutdown feature on the
multiplexers as shown below.

6. Conclusion

mSATA and PCI Express Mini-Card are sharing the same physical connector type with
minor pin definition modification. Automatic card detection and signal multiplexing function
between SATA interface and PCI Express interface can be implemented using
CBTL02042A. PCB design should account for the insertion loss by the multiplexer, and
reduce the trace length accordingly.

Table 4.

Mini-Card/mSATA and SATA HDD device possible insertion combination

SATA HDD connector

None

SATA HDD

Mini-Card/mSATA

connector

None

possible

possible

Mini-Card

possible

possible

mSATA

possible

impossible

(mSATA active)

Table 5.

Multiplexer SEL pin logic table

CARD_DET signal state (pin 21)

SEL signal state (pin 43)

SEL pin on multiplexers

0

card inserted

0

Mini-Card

0

PCIe



Mini-Card

SATA



HDD

inverted



1

0

card inserted

1

mSATA

1

PCIe



X

SATA



Mini-Card

inverted



1

1

card absent

X (1)

card absent

0

PCIe



X

SATA



HDD

inverted



0

1

card absent

X (1)

card absent

0

PCIe



X

SATA



HDD

inverted



0

Fig 11. Multiplexer XSD signal implementation

019aab381

to XSD pins

R2

33 k

Ω

R3

33 k

Ω

V

DD

V

DD

pin 21 on Mini-Card connector

S1/S7 pin on HDD connector

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Содержание AN11001

Страница 1: ...ss Mini Card SATA SATA IO mSATA Abstract mSATA and PCI Express Mini Card are sharing the same physical connector type with minor pin definition modification Automatic card detection and signal multipl...

Страница 2: ...1 7 March 2011 2 of 17 Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com NXP Semiconductors AN11001 CBTL0...

Страница 3: ...h mSATA from SATA IO and Mini Card from PCI SIG share the same form factor and similar electrical pinout assignments on their connectors Mini Cards are PCI Express or PCIe based devices and PCIe inter...

Страница 4: ...P25 B host receiver differential signal pair PERp0 P26 GND return current path GND P27 GND return current path GND P28 1 5 V 1 5 V source 1 5 V P29 GND return current path GND P30 Two Wire Interface...

Страница 5: ...essor or CPU can utilize this information to enable either a SATA or a PCIe host controller on a notebook motherboard Figure 2 illustrates a typical block diagram of Mini Card mSATA sub system impleme...

Страница 6: ...or similar to a card detect signal found in most card based sub systems Pin 21 is chosen such that this pin is grounded on the device side When there is no device inserted in the connector socket the...

Страница 7: ...chip set to a Mini Card connector The PCIe interface is an x1 link and can be routed to different devices at varied locations of the board it is practical to route TX signals and RX signals of each l...

Страница 8: ...ching for either transmit or receive pair occurs within the same layer It is also recommended to not to use vias whenever possible A maximum of four vias are allowed on the path inclusive of the thoug...

Страница 9: ...1 inch 2 54 cm of PCB trace on FR4 material at frequency of 1 5 GHz At this frequency CBTL02042A exhibits signal loss of less than 1 dB or translating to 3 inches 7 62 cm to 4 inches 10 16 cm of PCB...

Страница 10: ...re 7 however it is strongly suggested for a PCB designer to route the main route on the top layer as shown in Figure 6 by moving the second via which is close to the AC coupling capacitor to the break...

Страница 11: ...pology a designer should pay special attention to the insertion loss caused by the multiplexers and adjust the trace length accordingly The SATA interface signals to Mini Card mSATA connector go throu...

Страница 12: ...1_P A1_N n c SEL GND A2_P A2_N VDD GND A3_P A3_N GND n c XSD23 V DD GND B0_P B0_N B1_P B1_N C0_P C0_N C1_P C1_N VDD B2_P B2_N B3_P B3_N C2_P C2_N C3_P C3_N V DD XSD01 V DD GND CBTL04082A 10 nF A A B B...

Страница 13: ...e configuration shown in Figure 10 keeps signals to the controllers and to the connectors on the opposite sides of the multiplexers and fits this layout profile perfectly When an mSATA device is not i...

Страница 14: ...on the multiplexers as shown below 6 Conclusion mSATA and PCI Express Mini Card are sharing the same physical connector type with minor pin definition modification Automatic card detection and signal...

Страница 15: ...application for mSATA PCIe Mini Card 7 Abbreviations Table 6 Abbreviations Acronym Description CPU Central Processing Unit ECN Engineering Change Notice EMI ElectroMagnetic Interference ESR Equivalen...

Страница 16: ...orized or warranted to be suitable for use in life support life critical or safety critical systems or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can r...

Страница 17: ...escribed herein have been included in section Legal information 9 Contents 1 Introduction 3 2 Mini Card and mSATA applications 3 3 Switching circuit schematic 6 4 Mini Card mSATA routing guidelines su...

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