Texas Instruments TMS320DM644x manual MMC Response Time-Out Register Mmctor, Tor

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Registers

Table 10. MMC Interrupt Mask Register (MMCIM) Field Descriptions (continued)

Bit	Field	Value	Description
3	ETOUTRD		Read-data time-out event (TOUTRD) interrupt enable.
		0	Read-data time-out event interrupt is disabled.
		1	Read-data time-out event interrupt is enabled.
2	ERSPDNE		Command/response done (RSPDNE) interrupt enable.
		0	Command/response done interrupt is disabled.
		1	Command/response done interrupt is enabled.
1	EBSYDNE		Busy done (BSYDNE) interrupt enable.
		0	Busy done interrupt is disabled.
		1	Busy done interrupt is enabled.
0	EDATDNE		Data done (DATDNE) interrupt enable.
		0	Data done interrupt is disabled.
		1	Data done interrupt is enabled.

4.6MMC Response Time-Out Register (MMCTOR)

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

The MMC response time-out register (MMCTOR) is shown in Figure 23 and described in Table 11.

Figure 23. MMC Response Time-Out Register (MMCTOR)

31					16
			Reserved
				R-0
15	13	12	8	7	0
	Reserved		TOD_20_16		TOR
	R-0		R/W-0		R/W-0

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

Table 11. MMC Response Time-Out Register (MMCTOR) Field Descriptions

Bit	Field	Value	Description
31-13	Reserved	0	Reserved
12-8	TOD_20_16	0-1Fh	Data read time-out count upper 5 bits. Used in conjunction with the TOD_15_0 bits in MMCTOD to
			form a 21-bit count. See MMCTOD (Section 4.7).
7-0	TOR	0-FFh	Time-out count for response.
		0	No time out
		1-FFh	1 CLK clock cycle to 255 CLK clock cycles

SPRUE30B –September 2006	Multimedia Card (MMC)/Secure Digital (SD) Card Controller	47
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