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| 型號(hào)： | AS8201 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | TTP/C-C1 Communications Controller |
| 中文描述： | 2 CHANNEL(S), 2M bps, SERIAL COMM CONTROLLER, PQFP120 |
| 封裝： | PLASTIC, QFP-120 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 247K |
| 代理商： | AS8201 |
TTP/C-C1 Communications Controller Data Sheet
AS8201
Rev. NC, October 1999
Page 3 of 13
Austria Mikro Systeme International AG
The CNI (controller 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 before run time when the system starts up.
Package and Pin Assignment
Type: PQFP 120, plastic quad flat package
TTP/C-C1
Communications
Controller
(TOP VIEW)
Figure 1 PQFP 120 pin package and pin assignment
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