AS8202NF Datasheet, PDF (1/20 Pages) ams AG – TTP-C2NF Communication Controller

AS8202NF
TTP-C2NF Communication Controller
Data Sheet
1 General Description
The AS8202NF communication controller is an
integrated device supporting serial communication
according to the TTP specification version 1.1. It
performs all communication tasks such as reception and
transmission of messages in a TTP cluster without
interaction of the host CPU. TTP provides mechanisms
that allow the deployment in high-dependability
distributed real-time systems. It provides the following
services:
Predictable transmission of messages with minimal
jitter
Fault-tolerant distributed clock synchronization
Consistent membership service with small delay
Masking of single faults
2 Key Features
Dual-channel controller for redundant data transfers
Dedicated controller supporting TTP (time-triggered
protocol class C)
Suited for dependable distributed real-time systems
with guaranteed response time
Asynchronous data rate up to 5 Mbit/s (MFM/
Manchester)
Synchronous data rate 5 to 25 Mbit/s
Bus interface (speed, encoding) for each channel
selectable independently
Figure 1. Block Diagram
40 MHz main clock with support for 10 MHz crystal,
10 MHz oscillator or 40 MHz oscillator
16 MHz bus guardian clock with support for 16 MHz
crystal or 16 MHz oscillator
Single power supply 3.3V, 0.35µm CMOS process
Full automotive temperature range (-40ºC to 125ºC)
16k x 16 SRAM for message, status, control area
(communication network interface) and for
scheduling information (MEDL)
4k x 16 (plus parity) instruction code RAM for
protocol execution code
Data sheet conforms to protocol revision 2.04
16k x 16 instruction code ROM containing startup
execution code and deprecated protocol code
revision 1.00
16 Bit non-multiplexed asynchronous host CPU
interface
16 Bit RISC architecture
Software tools, design support, development boards
available (www.tttech.com)
Certification support package according to RTCA/
DO-254 DAL A available (www.tttech.com)
80 pin LQFP80 Package
3 Applications
Application fields: automotive (by-wire braking, steering,
vehicle dynamics control, drive train control), aerospace
(aircraft electronic systems), industrial systems, railway
systems.
D[15:0]
Host
A[11:0]
Processor
Interface
CEB
OEB
WEB
READYB
INTB
LED[2:0]
RAM_CLK_TESTSE
USE_RAM_CLK
AS8202NF
Communication
network
interface
(CNI)
TTP
Protocol
processor core
Receiver
Bus guardian
Transmitter
RxD[1:0]
RXCLK[1:0]
RxDV[1:0]
RXER[1:0]
XIN1
XOUT1
TTP Bus
Media
Drivers
TxD[1:0]
CTS[1:0]
TxCLK[1:0]
Quartz or
Oscillator
XIN0
XOUT0
PLLOFF
RESETB
Instruction
memory
RAM & ROM
Test
Interface
RAM_CLK_TESTSE
FTEST
STEST
Test
FIDIS
Interface
TTEST
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