K60P100M100SF2RM Datasheet, PDF (1639/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

• No read or write transfer is active
• Data and command lines are not active
• No interrupts are pending
• Internal data buffer is empty
Chapter 52 Secured digital host controller (SDHC)
52.5.9 MMC fast boot
In Embedded MultiMediaCard(eMMC4.3) spec, add fast boot feature need hardware
support.
In boot operation mode, the master (multimediacard host) can read boot data from the
slave (MMC device) by keeping CMD line low after power-on, or sending CMD0 with
argument + 0xFFFFFFFA (optional for slave), before issuing CMD1.
There are two types of fast boot mode, ' boot operation ' and ' Alternative boot operation '
in eMMC4.3 spec. Each type also has with acknowledge and without acknowledge
modes.
Note
for the eMMC4.3 card setting, please refer to eMMC4.3 spec
52.5.9.1 Boot operation
Note
in this block guide, this fast boot is called normal fast boot
mode
If the CMD line is held low for 74 clock cycles and more after power-up before the first
command is issued, the slave recognizes that boot mode is being initiated and starts
preparing boot data internally.
Within 1 second after the CMD line goes low, the slave starts to send the first boot data
to the master on the DAT line(s). The master must keep the CMD line low to read all of
the boot data.
If boot acknowledge is enabled, the slave has to send acknowledge pattern '010' to the
master within 50 ms after the CMD line goes low. If boot acknowledge is disabled, the
slave will not send out acknowledge pattern '010'.
The master can terminate boot mode with the CMD line high.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1639