AS8202 PDF даташит
Спецификация AS8202 изготовлена «austriamicrosystems AG» и имеет функцию, называемую «TTP/C-C2 Communication Controller». |
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Детали детали
Номер произв | AS8202 |
Описание | TTP/C-C2 Communication Controller |
Производители | austriamicrosystems AG |
логотип |
10 Pages
No Preview Available ! |
AS8202
TTP/C-C2 Communication
Controller
Preliminary Data Sheet
Rev. 1.0, October 2000
No Preview Available ! |
TTP/C-C2 Communication Controller – Preliminary Data Sheet
AS8202
Key Features
• Dedicated controller supporting TTP/C (time triggered protocol class C)
• Suited for dependable distributed real-time systems with guaranteed response time
• Application fields: Automotive (by-wire braking, steering, vehicle dynamics control, drive
train control), Aerospace (aircraft electronic systems), Industrial systems, Railway systems
• TTP/C asynchronous data rate up to 5 MBit/s @ clock 40 MHz, synchronous data rate 25
MBit/s @ clock 40 MHz
• Single power supply 3.3V
• 0.35µm CMOS process
• Temperature range: -40°C to 125° C
• 2k x 16 RAM message, status and control area (communication network interface)
• RAM for instruction code and configuration data
• 16 Bit non-multiplexed host CPU interface
• 16 Bit RISC architecture
• 16k x 16 internal FLASH memory for firmware and scheduling information
• software tools, design-in support, development boards available ( http://www.tttech.com)
• 80 pin TQFP Package
General Description
The AS8202 communications controller is an integrated device supporting serial
communication according to the TTP/C specification. It performs all communications 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 following services:
• predictable transmission of messages with minimal jitter
• fault-tolerant distributed clock synchronisation
• consistent membership service with small delay
• masking of single faults
Host
Processor
Interface
Quartz or
Oscillator
ram_data[15:0]
ram_address[11:0]
ram_ceb
ram_oeb
ram_web
ram_readyb
time_signalb
led[0]/time_tick
led[1]/time_overflow
led[2]/microtick
xin0
xout0
resetb
plloff
Controller
network
interface
(CNI)
TTP/C
protocol
processor core
Reset &
Time
base
Receiver
Bus
guardian
Transmitter
rxd[1:0]
rxclk[1:0]
rxdv[1:0]
rxer[1:0]
xin1
xout1
txd[1:0]
cts[1:0]
txclk[1:0]
TTP/C
Bus -
Media
Drivers
FLASH
memory
Instruction
RAM memory
Network
configuration
memory
(MEDL)
test_se
ftest
stest
fidis
mtest
Test
Inter-
face
Figure 1 AS8202 Block Diagram
Rev. 1.0, October 2000
Page 2 of 2
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TTP/C-C2 Communication Controller – Preliminary Data Sheet
AS8202
The CNI (communication network interface) forms a temporal firewall. It decouples the
controller network from the host subsystem by use of a dual ported RAM. This prevents the
propagation of control errors. The interface to the host CPU is implemented as 16 bit wide non-
multiplexed asynchronous bus interface.
TTP/C follows a conflict-free media access strategy called time-division-multiple access
(TDMA). This means, TTP/C deploys a time slot technique based on a global time which is
permanently synchronised. Each node is assigned a time slot in which it is allowed to perform
transmit operation. The sequence of time slots is called TDMA round, a set of TDMA rounds
forms a cluster cycle. After one cluster cycle the operation of the network repeats. The
sequence of interactions forming the cluster cycle is defined in a static time schedule, called
message-descriptor-list (MEDL). The definition of the MEDL in conjunction with the global time
determines the response time for a service request.
The membership of all nodes in the network is evaluated by the communication controller. This
information is presented in a consistent fashion to all correct cluster members. During
operation, the status of every other node is propagated within one TDMA round. The MEDL is
loaded into the configuration memory when the system starts up.
Package and Pin Assignment
Type: TQFP 80, plastic package
60
61
Vdd
Vss
ram-data[8]
ram-data[9]
ram-data[10]
ram-data[11]
ram-data[12]
ram-data[13]
ram-data[14]
ram-data[15]
Vdd
Vss
ram-ceb
ram-oeb
ram-web
ram-readyb
to Vss
to Vdd
n.c.
n.c.
80
1
AS8202
TTP/C
Communications
Controller
(TOP VIEW)
41
40
ram-address[2]
ram-address[1]
ram-address[0]
mtest
led[2]/time-overflow
led[1]/time-tick
led[0]/microtick
Vss
Vdd
time-signalb
resetb
fidis
ftest
plloff
stest
test-se
Vss
xin1
xout1
Vdd
21
20
Figure 2 TQFP 80 pin package and pin assignment
Rev. 1.0, October 2000
Page 3 of 3
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Номер в каталоге | Описание | Производители |
AS8201 | TTP/C-C1 Communications Controller | austriamicrosystems AG |
AS8202 | TTP/C-C2 Communication Controller | austriamicrosystems AG |
AS8202B | TTP-C2NF Communication Controller | ams |
AS8202NF | TTP-C2NF Communication Controller | austriamicrosystems AG |
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