Transcend Information miniSDHC Card Series manual Taac, Nsac, Transpeed

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miniSDHC Card series

4GB High Capacity miniSD Card

CSD Register Structure

•TAAC

This field is fixed to 0Eh, which indicates 1 ms. The host should not use TAAC, NSAC, and R2W_FACTOR to calculate timeout and should uses fixed timeout values for read and write operations (See 4.6.2).

•NSAC

This field is fixed to 00h. NSAC should not be used to calculate time-out values.

•TRAN_SPEED

The following table defines the maximum data transfer rate per one data line - TRAN_SPEED:

Transcend Information Inc.

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Contents Features Placement4GB High Capacity miniSD Card Description Pin Definition4GB High Capacity miniSD Card Mtbf 4GB High Capacity miniSD Card Information4GB High Capacity miniSD Card Architecture Current Consumption Power Supply VoltageBus Signal Line Load Single card capacitance Parameter Symbol Min Max Unit Remark 4GB High Capacity miniSD Card Bus Signal Levels4GB High Capacity miniSD Card Bus Timing Output Delay time during Data Transfer Mode 4GB High Capacity miniSD Card Bus Timing High Speed Mode Output Hold time 4GB High Capacity miniSD Card Reliability and Durability OCR register 4GB High Capacity miniSD Card Register Information OID MID PNM PRVCRC PSNMDT CSD Register Fields CSD Version CsdstructureTranspeed TaacNsac Readbllen CCCReadblpartial WriteblkmisalignCsize WpgrpenableEraseblken SectorsizePermwriteprotect CopyTmpwriteprotect FileformatRCA Register Datastataftererase ScrstructureSdspec Sdbuswidths SdsecurityMechanical Description Top View MiniSDHC Card series MiniSDHC Card series 4GB High Capacity miniSD Card MiniSD Card package dimensions