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15-24 Intel® PXA255 Processor Developer’s Manual
MultiMediaCard Controller
15.5.3 MMC_CLKRT Register (MMC_CLKRT)
MMC_CLKRT, shown in Table 15-7, specifies the frequency division of the MMC bus clock. The
software is responsible for setting this register.
The software can only write this register after the clock is turned off and the software has received
an interrupt that indicates the clock is turned off.
8 CLK_EN
Clock Enabled
0 – MMC clock is off
1 – MMC clock is on
7
RECV_FIFO_
FULL
Receive FIFO Full
0 – Receive FIFO is not full
1 – Receive FIFO is full
6
XMIT_FIFO_E
MPTY
Transmit FIFO Empty
0 – Transmit FIFO is not empty
1 – Transmit FIFO is empty
5
RES_CRC_E
RR
Response CRC Error
0 – No error on the response CRC
1 – CRC error occurred on the response
4
SPI_READ_E
RROR_TOKE
N
SPI Read Error Token
0 – SPI data error token has not been received
1 – SPI data error token has been received
3
CRC_READ_
ERROR
CRC Read Error
0 – No error on received data
1 – CRC error occurred on received data
2
CRC_WRITE_
ERROR
CRC Write Error
0 – No error on transmission of data
1 – Card observed erroneous transmission of data
1
TIME_OUT_R
ESPONSE
Time Out Response
0 – Card response has not timed out
1 – Card response timed out
0
READ_TIME_
OUT
Read Time Out
0 – Card read data has not timed out
1 – Card read data timed out
Table 15-6. MMC_STAT Bit Definitions (Sheet 2 of 2)
Physical Address
0x4110_0004
MMC_STAT 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
END_CMD_RES
PRG_DONE
DATA_TRAN_DONE
reserved
CLK_EN
RECV_FIFO_FULL
XMIT_FIFO_EMPTY
RES_CRC_ERR
SPI_READ_ERROR_TOKEN
CRC_READ_ERROR
CRC_WRITE_ERROR
TIME_OUT_RESPONSE
READ_TIME_OUT
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0
Bits Name Description