Sd I/O Mode; Table 118. Erase Timeout Field; Table 119. Erase Offset Field - ST STM32F205 series Reference Manual

Secure digital input/output interface (SDIO)
ERASE_TIMEOUT
This 6-bit field indicates TERASE and the value indicates the erase timeout from offset
when multiple AUs are being erased as specified by ERASE_SIZE. The range of
ERASE_TIMEOUT can be defined as up to 63 seconds and the card manufacturer can
choose any combination of ERASE_SIZE and ERASE_TIMEOUT depending on the
implementation. Determining ERASE_TIMEOUT determines the ERASE_SIZE.
ERASE_TIMEOUT
00
01
02
03
---------
63
ERASE_OFFSET
This 2-bit field indicates T
meaningless if the ERASE_SIZE and ERASE_TIMEOUT fields are set to 0.
0h
1h
2h
3h
26.4.13

SD I/O mode

SD I/O interrupts
To allow the SD I/O card to interrupt the MultiMediaCard/SD module, an interrupt function is
available on a pin on the SD interface. Pin 8, used as SDIO_D1 when operating in the 4-bit
SD mode, signals the cards interrupt to the MultiMediaCard/SD module. The use of the
interrupt is optional for each card or function within a card. The SD I/O interrupt is level-
sensitive, which means that the interrupt line must be held active (low) until it is either
recognized and acted upon by the MultiMediaCard/SD module or deasserted due to the end
of the interrupt period. After the MultiMediaCard/SD module has serviced the interrupt, the
interrupt status bit is cleared via an I/O write to the appropriate bit in the SD I/O card's
internal registers. The interrupt output of all SD I/O cards is active low and the application
must provide external pull-up resistors on all data lines (SDIO_D[3:0]). The
MultiMediaCard/SD module samples the level of pin 8 (SDIO_D/IRQ) into the interrupt
detector only during the interrupt period. At all other times, the MultiMediaCard/SD module
ignores this value.
766/1378

Table 118. Erase timeout field

Erase timeout calculation is not supported.
1 [sec]
2 [sec]
3 [sec]
---------
63 [sec]
and one of four values can be selected. This field is
OFFSET

Table 119. Erase offset field

ERASE_OFFSET
RM0033 Rev 8
Value definition
Value definition
0 [sec]
1 [sec]
2 [sec]
3 [sec]
RM0033