Microsemi SmartFusion2 - 20 Watchdog Timer; Features

Inter-Integrated Circuit Peripherals
UG0331 User Guide Revision 15.0 538
15 Inter-Integrated Circuit Peripherals
Philips inter-integrated circuit (I2C) is a two wire serial bus interface that provides data transfer between
many devices. SmartFusion2 SoC FPGAs contain two identical I
2
C peripherals in the microcontroller
subsystem (MSS I2C_0 and MSS I2C_1), that provide a mechanism for serial communication between
the SmartFusion2 device and external I
2
C compliant devices.
SmartFusion2 I
2
C peripherals support the following protocols:
•I
2
C protocol as per v2.1 specification
• SMBus protocol as per v2.0 specification
• PMBus protocol as per v1.1 specification
15.1 Features
SmartFusion2 I
2
C peripherals support the following features:
• Master and Slave modes
• 7-bit addressing format and data transfers up to 100 Kbit/s in Standard mode and up to 400 Kbit/s in
Fast mode
• Multi-master collision detection and arbitration
• Own slave address and general call address detection
• Second slave address detection
• System management bus (SMBus) timeout and real-time idle condition counters
• Optional SMBus signals, SMBSUS_N and SMBALERT_N, which are controlled through the APB
interface
• Input glitch or spike filters
The following figure shows the I
2
C peripherals within the MSS. The I
2
C peripherals are connected to the
advanced high-performance bus (AHB) Matrix through the advanced peripheral bus (APB) interfaces
(APB_0 and APB_1).
Figure 228 • Microcontroller Subsystem Showing I
2
C Peripherals
AHB Bus Matrix
eSRAM_0
System
Controller
Cache
Controller
SD IC
ARM Cortex-M3
Processor
SDI
MSS DDR
Bridge
PDMA
MS6
MM3
AHB To AHB Bridge with Address Decoder
USB OTG
HPDMA
MDDR
APB_0
SYSREG
Triple Speed
Ethernet MAC
FIC_0
MM4 MS4
MS2 MS3 MS0
MS5
MS1
MM5 MM6
MM7
MM8
MM2 MM1 MM0 MM9
IDC
D/S
eNVM_0 eNVM_1 eSRAM_1
FIC_2 (Peripheral
Initialization)
APB_1
MMUART_0
SPI_0
I2C_0
PDMA
Configuration
WATCHDOG
FIIC
TIMERx2
MMUART_1
SPI_1
I2C_1
GPIO
CAN
RTC
COMM_BLK
FIC_1
MSS_FIC MS6_USB
MS5_MAC MS5_SR MS5_APB0 MS5_FIC2 MS5_APB1