Transcend Information miniSDHC Card Series 4GB High Capacity miniSD Card Register Information

Page 13

miniSDHC Card series

4GB High Capacity miniSD Card

Register Information

Within the card interface six registers are defined: OCR, CID, CSD, RCA, DSR and SCR. These can be accessed only by corresponding commands (see Chapter 4.7). The OCR, CID, CSD and SCR registers carry the card/content specific information, while the RCA and DSR registers are configuration registers storing actual configuration parameters.

1. OCR register

The 32-bit operation conditions register stores the VDD voltage profile of the card. Additionally, this register includes status information bits. One status bit is set if the card power up procedure has been finished. This register includes another status bit indicating the card capacity status after set power up status bit. The OCR register shall be implemented by the cards. The 32-bit operation conditions register stores the VDD voltage profile of the card. Bit 7 of OCR is newly defined for Dual Voltage Card and set to 0 in default. If a Dual Voltage Card does not receive CMD8, OCR bit 7 in the response indicates 0, and the Dual Voltage Card which received CMD8, sets this bit to 1.

Additionally, this register includes 2 more status information bits. Bit 31 - Card power up status bit, this status bit is set if the card power up procedure has been finished. Bit 30 - Card capacity status bit, this status bit is set to 1 if card is High Capacity SD Memory Card. 0 indicates that the card is Standard Capacity SD Memory Card. The Card Capacity status bit is valid after the card power up procedure is completed and the card power up status bit is set to 1. The Host shall read this status bit to identify a Standard or High Capacity SD Memory Card.

The OCR register shall be implemented by the cards.

OCR Register Definition

Transcend Information Inc.

13

Page 12 Page 14
Image 13
Page 12 Page 14
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 Bus Signal Line Load Power Supply VoltageCurrent Consumption 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 InformationOID MIDPNM PRVMDT PSNCRC CSD Register Fields CSD Version CsdstructureNsac TaacTranspeed Readbllen CCCReadblpartial WriteblkmisalignCsize WpgrpenableEraseblken SectorsizePermwriteprotect CopyTmpwriteprotect FileformatRCA Register Sdspec ScrstructureDatastataftererase Sdbuswidths SdsecurityMechanical Description Top View MiniSDHC Card series MiniSDHC Card series 4GB High Capacity miniSD Card MiniSD Card package dimensions
Top Page Image Contents