TMS320DM644x DMSoC Multimedia Card (MMC)/Secure Digital (SD) Card Controller User's Guide

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4.7 MMC Data Read Time-Out Register (MMCTOD)
Registers
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
Multimedia Card (MMC)/Secure Digital (SD) Card Controller48 SPRUE30B – September 2006
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