Resumo do conteúdo contido na página número 1
SanDisk SD-ROM Product Manual
Revision 1.0
SanDisk Corporation
Corporate Headquarters . 601 McCarthy Boulevard . Milpitas, California 95035
Phone: 408-801-1000 . Fax: 408-801-8657
www.sandisk.com
SanDisk Confidential
Resumo do conteúdo contido na página número 2
SanDisk® Corporation general policy does not recommend the use of its products in life support applications where in a failure or malfunction of the product may directly threaten life or injury. Per SanDisk Terms and Conditions of Sale, the user of SanDisk products in life support applications assumes all risk of such use and indemnifies SanDisk against all damages. See "Disclaimer of Liability." This document is for information use only and
Resumo do conteúdo contido na página número 3
1 SD-ROM Card Overview 1.1 Introduction SanDisk SD-ROM Cards provide permanent and secure read-only data storage for consumer electronic and personal computer applications. SanDisk SD-ROM Cards are based on SanDisk’s unique 3D one-time programmable (OTP) memory devices which safely store data for 100 years. This compares favorably with cards based on flash memory devices, which are typically rated to store data for 10 years or less. And unlike cards based on mask ROM memory devices, Sa
Resumo do conteúdo contido na página número 4
2 SanDisk SD-ROM Card Functional Description SanDisk SD-ROM Cards are compatible with the SD specifications, with some changes necessary for a read-only memory. In an SD host system, the host controls all communication between itself and the cards. For detailed information, refer to Section 4 of the SDA Physical Layer Specification, Version 2.00. This chapter contains the functional description for SanDisk SD-ROM Cards. 2.1 SD Bus Protocol Communication over the SD bus is based on comman
Resumo do conteúdo contido na página número 5
2.7 Card State Transitions SanDisk SD-ROM Cards operate the same as standard SD cards, where the state transition is dependent on the received command along with responses sent on the command line. The transitions are defined in Section 4.8 of the SDA Physical Layer Specification, Version 2.00 In Card Identification Mode, the host operates the card at a slower frequency as it identifies and initializes the card. For more information see Section 4.2 in the SDA Physical Layer Specification
Resumo do conteúdo contido na página número 6
3 SanDisk SD-ROM Card Specifications 3.1 Operating Specifications The table below summarizes the SD-ROM operating specifications. Parameter Value Notes Supply Voltage 2.0 – 3.6v during card identification for version 1.1 cards 2.7 – 3.6v all supported commands Operating Temperature -25 – 85 °C Storage Temperature -40 – 85 °C Data Retention 100 years minimum 9 Data Endurance 1x10 read cycles Interface speed 0 – 25MHz variable clock rate Read Bandwidth 1.8MB/s minimum sequential
Resumo do conteúdo contido na página número 7
Register Abbreviation Width (in bits) Register Name CID 128 Card IDentification CSD 128 Card-Specific Data SCR 64 SD Configuration Register RCA 16 Relative Card Address OCR 32 Operation Condition Register SSR 512 SD Status Register CSR 32 Card Status Register All card registers are also accessible in SPI Mode. Their format is identical to the format in the SD Bus Mode; however, a few fields are not used in SPI Mode. In SPI Mode, the Card Status Register has a different, shorter format
Resumo do conteúdo contido na página número 8
Field Value Comments CSD_STRUCTURE 1.0 CSD structure Reserved Reserved TAAC 1.5ms Data read access time – 1 Data read access time – 2 in CLK cycles NSAC 0 (NSAC*100) TRANS_SPEED 25MHz Maximum data transfer rate CCC 0x5F5 Card Command Classes READ_BL_LEN 512 bytes Maximum read data block length READ_BL_PARTIAL Yes Partial blocks for read allowed WRITE_BLK_MISALIGN No Write block misalignment READ_BLK_MISALIGN No Read block misalignment DSR_IMP No DSR implemented Reserved
Resumo do conteúdo contido na página número 9
3.3.4 Card Status Register The Card Status Register (CSR) transmits the card's status information to the host. The CSR is defined in Section 4.10.1 in the SDA Physical Layer Specification, Version 2.00. 3.3.5 SD Status Register The SD Status Register (SSR) contains status bits that are related to the SD Card proprietary features and may be used for future applications. The SD Status structure is described in Section 4.10.2 in the SDA Physical Layer Specification, Version 2.00. 3.3.6 Rel
Resumo do conteúdo contido na página número 10
connect external pullup resistors to all data lines even if only DAT0 is to be used. Otherwise, non-expected high current consumption may occur due to the floating inputs of DAT1 and DAT2 (in case they are not used). For more details regarding the SD Bus topology, refer to Section 3.5.1 of the SDA Physical Layer Specification, Version 2.00. For more details regarding the SPI Bus topology, refer to Section 3.5.2 of the SDA Physical Layer Specification, Version 2.00. 3.5 Electrical Interf
Resumo do conteúdo contido na página número 11
SanDisk Confidential
