发明申请
US20090204732A1 Single-Chip Multi-Media Card/Secure Digital (MMC/SD) Controller Reading Power-On Boot Code from Integrated Flash Memory for User Storage
有权
单芯片多媒体卡/安全数字(MMC / SD)控制器从用于存储用户的集成闪存中读取上电引导代码
- 专利标题: Single-Chip Multi-Media Card/Secure Digital (MMC/SD) Controller Reading Power-On Boot Code from Integrated Flash Memory for User Storage
- 专利标题(中): 单芯片多媒体卡/安全数字(MMC / SD)控制器从用于存储用户的集成闪存中读取上电引导代码
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申请号: US12426378申请日: 2009-04-20
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公开(公告)号: US20090204732A1公开(公告)日: 2009-08-13
- 发明人: I-Kang Yu , Abraham C. Ma , Charles C. Lee
- 申请人: I-Kang Yu , Abraham C. Ma , Charles C. Lee
- 申请人地址: US CA San Jose
- 专利权人: SUPER TALENT ELECTRONICS INC.
- 当前专利权人: SUPER TALENT ELECTRONICS INC.
- 当前专利权人地址: US CA San Jose
- 主分类号: G06F13/28
- IPC分类号: G06F13/28 ; H03M13/09 ; G06F12/02 ; G06F13/00
摘要:
A Multi-Media Card/Secure Digital (MMC/SD) single-chip flash device contains a MMC/SD flash microcontroller and flash mass storage blocks containing flash memory arrays that are block-addressable rather than randomly-addressable. MMC/SD transactions from a host MMC/SD bus are read by a bus transceiver on the MMC/SD flash microcontroller. Various routines that execute on a CPU in the MMC/SD flash microcontroller are activated in response to commands in the MMC/SD transactions. A flash-memory controller in the MMC/SD flash microcontroller transfers data from the bus transceiver to the flash mass storage blocks for storage. Rather than boot from an internal ROM coupled to the CPU, a boot loader is transferred by DMA from the first page of the flash mass storage block to an internal RAM. The flash memory is automatically read from the first page at power-on. The CPU then executes the boot loader from the internal RAM to load the control program.