Secure digital input/output interface (SDIO) RM0008
575/1128 DocID13902 Rev 15
The maximum clock frequency for a stream write operation is given by the following
equation fields of the card-specific data register:
• Maximumspeed = maximum write frequency
• TRANSPEED = maximum data transfer rate
• writebllen = maximum write data block length
• NSAC = data read access time 2 in CLK cycles
• TAAC = data read access time 1
• R2WFACTOR = write speed factor
If the host attempts to use a higher frequency, the card may not be able to process the data
and stop programming, set the OVERRUN error bit in the status register, and while ignoring
all further data transfer, wait (in the receive data state) for a stop command. The write
operation is also aborted if the host tries to write over a write-protected area. In this case,
however, the card sets the WP_VIOLATION bit.
Maximumspeed MIN TRANSPEED
82
writebllen
×()NSAC–()
TAAC R2WFACTOR×
------------------------------------------------------------------------(, )=
To Next Page
Loading...
Need help?
General
