Initialization Phase; Detail Of Basic Operation - Texas Instruments OMAP5910 Technical Reference Manual

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MMC/SD Host Controller

Figure 7–54. Initialization Phase

Figure 7–55. Detail of Basic Operation

In all modes (MMC, SD, SPI) a initialization phase is necessary at the begin-

ning. After the MMCSD adapter woks differently depending if the host sends

a command without data, with data, and, depending the type, the index of the

response and the direction.

Initialization

(set system configuration)

Host activity

The user must set several registers

Adapter activity

Waiting IRQ by the host unit

Write MMC_CON

Choose the mode and frequency

Write MMC_IE

Enable interrupts

Write MMC_CTO

Command time-out value

Write MMC_DTO

Data time-out value

Next operation