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Functional Description
18.3.16 MMC/SD/SDIO Hardware Status Features
Table 18-16 summarizes the MMC/SD/SDIO hardware status features.
Table 18-16. MMC/SD/SDIO Hardware Status Features
Register/Bit
Feature Type Field/Observability Control Description
Interrupt flags See Section 18.3.4.
CMD line signal level Status [24] CLEV Indicates the level of the cmd line
DAT lines signal level Status [23:20] DLEV Indicates the level of the data lines
Buffer read enable Status [11] BRE Readable data exists in the buffer.
Buffer write enable Status [10] BWE Indicates whether there is enough space in the
buffer to write BLEN bytes of data
Read transfer active Status [9] RTA This status is used for detecting completion of a
read transfer.
Write transfer active Status [8] WTA This status indicates a write transfer active.
Data line active Status [2] DLA Indicates whether the data lines are active
Command Inhibit (data lines) Status [1] DATI Indicates whether issuing of command using
data lines is allowed
Command inhibit (CMD line) Status [0] CMDI Indicates whether issuing of command using
CMD line is allowed
3383
SPRUH73H–October 2011–Revised April 2013 Multimedia Card (MMC)
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