AS8202B Datasheet, PDF (1/20 Pages) ams AG – TTP-C2NF Communication Controller

AS8202B
TTP-C2NF Communication Controller
1 General Description
The AS8202B 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 standardized in SAE 6003)
Suited for dependable distributed real-time systems with
guaranteed response time
Asynchronous data rate up to 4 Mbit/s (MFM/Manchester)
Synchronous data rate 20 to 25 Mbit/s
Bus interface (speed, encoding) for each channel selectable
independently
Figure 1. Block Diagram
40 MHz oscillator clock support
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
Datasheet conforms to protocol revision 2.05
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
Visit www.tttech.com
Certification support package according to RTCA/DO-254 DAL
A available – Visit www.tttech.com
RoHS conform
3 Applications
The device is ideal for application fields such as, aerospace
according to DO-254 level A (e.g. flight control, power distribution,
engine control), industrial systems, and railway systems.
D[15:0]
A[11:0]
CEB
OEB
WEB
READYB
INTB
LED[2:0]
RAM_CLK_TESTSE
USE_RAM_CLK
AS8202B
XIN0
RESETB
Communication
Network
Interface
(CNI)
TTP Protocol
Processor Core
TTP Bus Unit
Asynchronous
Bus Interface
(MFM/
Manchester)
Synchronous
Bus Interface
(MII)
Bus
GuBaurds i
Guaanrdian
Instruction Memory
RAM & ROM
Test Interface
RxD[1:0]
RxCLK[1:0]
RxDV[1:0]
RxER[1:0]
TxCLK[1:0]
TxD[1:0]
CTS[1:0]
XIN1
XOUT1
RAM_CLK_TESTSE
FTEST
STEST
FIDIS
TTEST
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