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AS3524 数据表(PDF) 46 Page - ams AG |
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AS3524 数据表(HTML) 46 Page - ams AG |
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46 / 124 page  AS3524 C21 / C22 austriamicrosystems Data Sheet, Confidential © 2003-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.11 46 - 124 5.3.5 MCI – SD / MMC Card Interface Features • Conformance to Multimedia Card Specification v2.11 • Conformance to Secure Digital Memory Card Physical Layer Specification, v0.96 • uses multimedia card bus or SD card bus. The PrimeCell™ MCI provides an interface between the APB system bus and multimedia and/or secure digital memory cards. It consists of two parts: • The PrimeCell™ MCI adapter block includes the clock generation unit, the power management control, command and data transfer • the APB interface provides access to the MCI adapter registers, and generates interrupt and DMA request signals. Figure 19 Multimedia Card Interface Block Diagram The connections to the Multimedia Card Interface are shared with the General Purpose I/O port-D (GPIO xpd[0:7]). Following diagram shows the external circuit elements for connection to a SD card adapter. Note that a feedback clock must be routed back to xpd[6]/mci_fbclk. Figure 20 Connecting SD / MC to GPIO-D |
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