Microchip Technology ATSAMA5D2-ICP User Manual page 23

One EEPROM device at the address 50h is used as a "software label" to store board information such as
CAUTION
chip type, manufacturer name and production date, using the last two 16-byte blocks in memory. The
information contained in these blocks should not be modified.
Table 3-8. EEPROM TWI Address
Table 3-9. EEPROM PIO Signal Descriptions
PIO
PD19
PD20
The figure below illustrates the implementation of the three EEPROM memories.
Figure 3-17. EEPROM 24AA025E48
3V3
R91
10k
GND
PD19_EEPROM1
PD20_EEPROM1
3.2.7 Secure Digital Multimedia Card (SDMMC) Interface
The SD (Secure Digital) Card is a non-volatile memory card format used as mass storage memory in mobile devices.
3.2.7.1 Secure Digital Multimedia (SDMMC) Controller
The SAMA5D2-ICP board has one Secure Digital Multimedia Card (SDMMC) interface that supports the MultiMedia
Card (e.MMC) Specification V4.41, the SD Memory Card Specification V3.0, and the SDIO V3.0 specification. It is
compliant with the SD Host Controller Standard V3.0 specification.
The SDMMC0 interface is connected to a standard SD card connector.
3.2.7.2 SD Card Socket
A standard MMC/SD card connector, connected to SDMMC0, is mounted on the bottom side of the board. The
SDMMC0 communication is based on an 8-pin interface (clock, command, four data and power lines). It includes a
card detection switch.
The figure below illustrates the implementation for the SDMMC0 interface.
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2020 Microchip Technology Inc.
Address + Offset + R/W Bit
Base (1010) + Offset (001) + R/W
Base (1010) + Offset (011) + R/W
Base (1010) + Offset (000) + R/W
Mnemonic
TWD1
TWCK1
U9 3V3
5 6
A0 VCC
4
A1
C92
0.1uF
3
SDA 16V PD19_EEPROM2
0402
1 2
SCL VSS PD20_EEPROM2
24AA025E48
GND
Shared
EEPROM TWI
EEPROM TWI
3V3
R97 R98
10k 10k U10 3V3
5 6
A0 VCC
4
A1
C98
0.1uF
3
SDA 16V
0402
1 2
SCL VSS
24AA025E48
GND
User Guide
ATSAMA5D2-ICP
Board Components
Component
EEPROM1(U9)
EEPROM2 (U10)
EEPROM3 (U11)
Signal Description
TWI Data
TWI Clock
U11
5
A0 VCC
4
A1
GND
3
PD19_EEPROM3 SDA
1
PD20_EEPROM3 SCL VSS
24AA025E48
DS60001592A-page 23
3V3
6
C109
0.1uF
16V
0402
2
GND