DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 51 of 96
2008-08-26
3.10.2
SD 1 Bit Mode
Table 20: Pin assignment of SD card interface X301 (SD 1 bit mode)
X301
pin
X301
signal
name
I/O
Description
Remark
X100
signal
name
Configuration
switches
1 - I/O Not
used
SD_D3 S453:3
S301:1
2 CMD
O Command
/
Response
SD_CMD
S455:1
S303:1
3 VSS1
Supply
Ground
GND
4 VDD
Supply
Supply
voltage
2.9V
5 CLK
O Clock
25.4kHz
…13MHz
(depends on SW
performance)
SD_CLK S454:1
S305:1
6 VSS2
Supply
Ground
GND
7 DATA
I/O Data
line
SD_D0 S450:1
S307:1
8 -
Not
used
9 -
Not
used
10 CD I
Card
detection
0 = card inserted
1 = card removed
Note:
On each edge an
interrupt will be generated.
Removing the card will stop
its operation before
disconnecting it.
SD_DET
11 WP I
Write
protect
detection
0 = unlocked
1 = locked
SD_WP