Related Information
http://www.altera.com/literature/hb/cyclone-v/cv_54011.pdf
For more information about the SD/MMC, refer to the
SD/MMC Controller
chapter in the Cyclone V Device
Handbook, Volume 3.
Default settings of the SD/MMC controller.
Table A-7: SD/MMC Controller Default Settings
Register Value
Default
Parameter
The card type register
(
ctype
) in the SD/
MMC controller
registers (
sdmmc
) = 0x0
1 bit
Card type
The timeout register
(
tmout
) = 0xFFFFFFFF
Maximum
Timeout
The RX watermark level
field (
rx_wmark
) of
the FIFO threshold
watermark register
(
fifoth
) = 0x1
1
FIFO threshold RX watermark level
The clock source register
(
clksrc
) = 0x0
0
Clock source
The block size register
(
blksiz
) = 0x200
512
Block size
The clock divider
register (
clkdiv
)=
0x10 (2*16=32)
32
Identification mode
Clock divider
The clock divider
register (
clkdiv
)=
0x00
Bypass
Data transfer mode
CLKSEL Pin Settings for the SD/MMC Controller
Table A-8: SD/MMC Controller CLKSEL Pin Settings
CLKSEL Pin
Setting
3
2
1
0
25–50 MHz
12.5–25 MHz
10–12.5 MHz
10–50 MHz
osc1_clk
(
EOSC1
pin) range
Booting and Configuration Introduction
Altera Corporation
cv_5400a
Default settings of the SD/MMC controller.
A-18
2013.12.30