ATM Formatter
Features
- Supports rate control by external AAL5 formatter
- Controls the rate based on the depth of the buffer
- Supports the use of first payload byte as constant pointer value
- Includes configurable formatter virtual path identifier/virtual channel identifier (VPI/VCI)
- Generates an internal header error control (HEC)
- Allows interfacing between formatter output and arbiter
- Uses fully synchronous design
Block Diagram
Figure 1 shows a block diagram of the function.
Figure 1. ATM Formatter Function
Description
The ATM Formatter core serves as an efficient asynchronous transfer mode (ATM) payload wrapper for basic ATM mode requirements. Typical applications for this core include telecommunications and wide area network (WAN), digital subscriber line (xDSL) equipment, multiplexing equipment, video conferencing, and video streaming.
The core also provides ATM formatting for a data stream. The formatter supports data rates controlled by an external AAL5 formatter in AAL5 mode, or can control the rate based on the depth of a buffer. The formatter also supports the use of the first payload bytes as a constant pointer value (that can be used for routing purposes). The formatter VPI/VCI is configurable and the HEC is internally generated. The formatter output is designed to interface with an arbiter.
Device Utilization and Performance
Table 1 lists the typical device utilization results for the megafunction.
| Table 1. Typical Device Utilization for the Megafunction |
| Target Device |
Speed Grade |
Utilization |
Performance
(fMAX) |
Parameter
Setting |
| LEs (1) |
I/O Pins |
| APEX™ 20KE |
-1 |
121 |
61 |
140.65 MHz |
None |
| ACEX® 1K |
-1 |
147 |
61 |
133.33 MHz |
None |
Note:
-
Contact Information
For additional information, contact:
Adaptive Micro-Ware, Inc.
6917 Innovation Boulevard
Fort Wayne, IN 46818 USA
Tel: (260) 489-0046
Fax: (260) 489-8087
E-mail: ipcores@adaptivemicro.com
URL: www.adaptivemicro.com
|
文档资料
> 
