Mmc_Rdto Register - Intel PXA255 Developer's Manual

MultiMediaCard Controller
15.5.7 MMC_RDTO Register (MMC_RDTO)
MMC_RDTO, shown in
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:
Time-out Delay
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.
Table 15-11. MMC_RDTO Register
Physical Address
0x4110_0018
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
Reset 0 0 0 0 0 0
Bits Name
31:16
15:0 READ_TO
15-28
Table 15-11, determines the length of time that the controller waits after a
(
MMC_RDTO[READ_TO]
= ----------------------------------------------------------------------------------------- -
20MHz

MMC_RDTO Register

reserved
0 0 0 0 0 0 0
— reserved
Specifies the length of time before a data read time-out
) × ( ) (
256 MMC_RDTO[READ_TO]
= ----------------------------------------------------------------------------------------- - sec
0 0 0 1 1 1 1 1
Description
Intel® PXA255 Processor Developer's Manual
) × ( )
128
7
10
MultiMediaCard Controller
8 7 6 5 4 3
READ_TO
1 1 1 1 1 1 1 1
2 1 0
1 1 1