3 Development Board Circuit
3.11 RTC
DBUG375-1.2E
21(34)
3.10.2
Pinout
Table 3-12 SD Card Pinout
Name
FPGA Pin No. BANK
I/O Level Description
SD_D0
W5
5
3.3V
Data bit 0
SD_D1
U6
5
3.3V
Data bit 1
SD_D2
Y6
5
3.3V
Data bit 2
SD_CD/D3
U7
5
3.3V
Card detection/Data bit 3
SD_CMD
W6
5
3.3V
Commands/Response
SD_CLK
V6
5
3.3V
Clock
SD_SWITCH
Y22
3
1.5V
Insertion Detection
3.11
RTC
3.11.1
Introduction
The real-time clock module uses a chip that is externally connected
with 32.768kHz quartz crystal. It can be powered by the board power
supply and the button battery. The communication interface with the FPGA
is I2C. The connection diagram is follows.
Figure 3-11 Connection Diagram of RTC
RTC Module
RTC_INT
IIC_SDA
RTC_CLK
IIC_SCL
3.11.2
Pinout
Table 3-13 RTC Pinout
Name
FPGA Pin No.
BANK
I/O Level
Description
RTC_CLK
D13
1
2.5V
Clock signal
RTC_INT
D14
1
2.5V
Interrupt signal
IIC_SCL
A13
1
2.5V
I2C signal
IIC_SDA
C13
1
2.5V
I2C signal