ATM Deformatter
Features
- Includes serial or parallel input modes
- Supports up to eight virtual path identifier/virtual channel identifier (VPI/VCI) combinations
- Enables channels to be selected when they are compiled
- Configures addresses in run-time
- Uses first byte of payload as channel router
- Verifies header error control (HEC) code
- Features payload type identifier output support of AAL-5
- Uses fully synchronous design
Block Diagram
Figure 1 shows a block diagram of the function.
Figure 1. ATM Deformatter Function
Description
The ATM Deformatter core is a highly efficient core that provides asynchronous transfer mode (ATM) deformatting functionality for basic ATM mode requirements. Typical applications for this core include telecommunications and wide area networks (WANs), xDSL equipment, multiplexing equipment, video conferencing, and video streaming.
The core can support up to eight individual VPI/VCI combinations and a transport channel that can route the eight channels based on the first payload byte using a common VPI/VCI. It also accepts either a serial input stream or a byte-wide parallel stream.
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 |
262 (2) |
72 |
112.89 MHz |
None |
| ACEX® 1K |
-1 |
310 (3) |
72 |
113.64 MHz |
None |
Notes:
- LEs = Logic elements
- 262 LEs for the first channel, and 40 LEs per channel thereafter
- 310 LEs for the first channel, 45 LEs per channel thereafter
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
Email: ipcores@adaptivemicro.com
URL: www.adaptivemicro.com
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