K60P100M100SF2RM Datasheet, PDF (1588/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Memory map and register definition
SDHC_PRSSTAT field descriptions (continued)
Field
Description
This status bit is generated if either the DLA or the RTA is set to 1. If this bit is 0, it indicates that the
SDHC can issue the next SD/MMC Command. Commands with a busy signal belong to CDIHB (e.g. R1b,
R5b type). Except in the case when the command busy is finished, changing from 1 to 0 generates a
transfer complete interrupt in the interrupt status register.
NOTE: The SD host driver can save registers for a suspend transaction after this bit has changed from 1
to 0.
0
CIHB
0b Can issue command which uses the DAT line
1b Cannot issue command which uses the DAT line
Command Inhibit (CMD)
If this status bit is 0, it indicates that the CMD line is not in use and the SDHC can issue a SD/MMC
Command using the CMD line.
This bit is set also immediately after the transfer type register is written. This bit is cleared when the
command response is received. Even if the CDIHB bit is set to 1, Commands using only the CMD line can
be issued if this bit is 0. Changing from 1 to 0 generates a command complete interrupt in the interrupt
status register. If the SDHC cannot issue the command because of a command conflict error (Refer to
command CRC error) or because of a command not issued by auto CMD12 error, this bit will remain 1
and the command complete is not set. The status of issuing an auto CMD12 does not show on this bit.
0b Can issue command using only CMD line
1b Cannot issue command
52.4.11 Protocol Control Register (SDHC_PROCTL)
There are three cases to restart the transfer after stop at the block gap. Which case is
appropriate depends on whether the SDHC issues a suspend command or the SD card
accepts the suspend command.
1. If the host driver does not issue a suspend command, the continue request shall be
used to restart the transfer.
2. If the host driver issues a suspend command and the SD card accepts it, a resume
command shall be used to restart the transfer.
3. If the host driver issues a suspend command and the SD card does not accept it, the
continue request shall be used to restart the transfer.
Any time stop at block gap request stops the data transfer, the host driver shall wait for a
transfer complete (in the interrupt status register), before attempting to restart the transfer.
When restarting the data transfer by continue request, the host driver shall clear the stop
at block gap request before or simultaneously.
1588
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.