DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 52 of 96
2008-08-26
3.10.3
SPI Bus Mode
This interface is an option and an alternative to the ASC1 and SPI2 interfaces. It has to be
reconfigured via AT commands as SPI bus mode SD card interface. For further information
refer to section 3.11.
Table 21: Pin assignment of SD card interface X301 (SPI bus mode)
X301
pin
X301
signal
name
I/O
Description
Remark
X100
signal
name
Configuration
switches
1
CS
O
Chip select
Active low
TXD1
S300:3
S301:3
S453:3
2
DI
I
Data input
Data out (DO) at SD card
side
CTS1 S306:3
S307:3
S450:3
3 VSS1
Supply
Ground
GND
4 VDD
Supply
Supply
voltage
2.9V
5
SCLK
O
Clock
up to 3.25MHz
RTS1
S304:3
S305:3
S454:3
6 VSS2
Supply
Ground
GND
7
DO
O
Data output
Data in (DO) at SD card
side
RXD1 S302:3
S303:3
S455:3
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
