7 mmc_rdto register (mmc_rdto), 7 mmc_rdto register (mmc_rdto) -28, Mmc_rdto register -28 – Intel PXA255 User Manual
Page 530
15-28
Intel® PXA255 Processor Developer’s Manual
MultiMediaCard Controller
15.5.7
MMC_RDTO Register (MMC_RDTO)
, determines the length of time that the controller waits after a
command before it turns on the time-out error if data has not been received. The length of time
before a time-out occurs is measured in increments of 256 20 MHz periods and can be calculated as
follows:
It is the software’s responsibility to calculate the value for READ_TO. The default value is 0xffff,
which corresponds to 838.848 ms.
This is a read/write register. Ignore reads from reserved bits. Write zeros to reserved bits.
Time-out Delay
MMC_RDTO[READ_TO]
(
)
256
(
)
×
20MHz
------------------------------------------------------------------------------------------
MMC_RDTO[READ_TO]
(
)
128
(
)
×
10
7
------------------------------------------------------------------------------------------ sec
=
=
Table 15-11. MMC_RDTO Register
Physical Address
0x4110_0018
MMC_RDTO Register
MultiMediaCard Controller
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
reserved
READ_TO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Bits
Name
Description
31:16
—
reserved
15:0
READ_TO
Specifies the length of time before a data read time-out