Functional Description
18.3.16 MMC/SD/SDIO Hardware Status Features
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
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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