Texas Instruments TMS320DM644x manual MMC Data Read Time-Out Register Mmctod

www.ti.com

Registers

4.7MMC Data Read Time-Out Register (MMCTOD)

The MMC data read time-out register (MMCTOD) defines how long the MMC controller waits for the data from a memory card before recording a time-out condition in the TOUTRD bit of the MMC status register 0 (MMCST0). If the corresponding ETOUTRD bit in the MMC interrupt mask register (MMCIM) is set, an interrupt is generated when the TOUTRD bit is set in MMCST0. If a memory card should require a longer time-out period than MMCTOD can provide, a software time-out mechanism can be implemented.

The MMC data read time-out register (MMCTOD) is shown in Figure 24 and described in Table 12.

	Figure 24. MMC Data Read Time-Out Register (MMCTOD)
31	16
	Reserved
	R-0
15	0

TOD_15_0

R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 12. MMC Data Read Time-Out Register (MMCTOD) Field Descriptions

Bit	Field	Value	Description
31-16	Reserved	0	Reserved
15-0	TOD_15_0	0-1F FFFFh	Data read time-out count. Used in conjunction with the TOD_20_16 bits in MMCTOR to form a
			21-bit count. See MMCTOR (Section 4.6).
		0	No time out
		1-FFFFh	1 CLK clock cycle to 2 097 151 CLK clock cycles

48	Multimedia Card (MMC)/Secure Digital (SD) Card Controller	SPRUE30B –September 2006
		Submit Documentation Feedback