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LAN/BT System Integration Manual

SD_DAT_3 DAT3 I/O

SDIO4‐bitmode:Datalinebit[3]

SDIO1‐bitmode:Notused

SDIOSPImode:Chipselect(Negativetrue)

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 2.1.2SDIOConnection/Function

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Figure1.1SDIOPhysicalConnection–4bitmode

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Note:In4‐bitSDIOmode,dataistransferredonall4datapins(DAT[3:0]),andtheinterruptpinisnot

availableforexclusiveuseasitisutilizedasadatatransferline.Thus,iftheinterruptfunctionisrequired,

aspecialtimingisrequiredtoprovideinterrupts.The4‐bitSDIOmodeprovidesthehighestdatatransfer

possible,upto100Mbps.

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2.2UARTInterface

ThemodulesupportsahighspeedUARTinterface,complianttotheindustrystandard16550

specification.Highspeedbaudratesaresupportedtoprovidethephysicaltransportbetweenthe

deviceandthehostforexchangingBluetoothdata.

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2.2.1SignalBehavior

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TXD

Serialdataoutputtotheperipheraldevice.

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RXD

Serialdatainputfromtoperipheraldevice.

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