T1 Deframer
Features
- Supports T1-Extended Super Frame (ESF) frame structure
- Features fast frame alignment time
- Provides frame alignment indicator
- Supports robbed signaling recovery
- Uses fully synchronous design
Block Diagram
Figure 1 shows a block diagram of the function.
Figure 1. T1 Deframer Function
Description
Use the T1 Deframer core in communication applications including multiplexing equipment, high-speed computer links, Internet access points, video conferencing, and video streaming.
The T1 Deframer design provides T1 synchronization and deframing using the ESF format. The deframer also provides clock synchronization from the T1 clock to the system clock for the data stream. The deframer receives clock and data from the network and uses internal RAM to quickly provide frame alignment (typically no more than 100 ms).
The deframed serial data passes to the next module at the system clock rate; the deframer provides outputs identifying the positions of the framing bits and an indicator for the first bit in the ESF multiframe structure. It also provides outputs indicating the current frame within a multi-frame, the current timeslot in a frame, and the current bit in a timeslot. This allows extraction of CRC6 and data link bits in the framing pattern and supports the extraction of robbed bit signaling. The deframer does not verify the CRC6 pattern.
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 |
ESBs (2) |
| APEX™ 20KE |
-1 |
145 |
23 |
3 |
130.63 MHz |
None |
| ACEX® 1K |
-1 |
183 |
23 |
2 |
80.65 MHz |
None |
Notes:
- LE = Logic element.
- ESB = Embedded system block
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
|
Literature
> 
