STM-0/1/4 (STS-1/3/12) Demapper
Features
- Accepts up to 12 input VCs
- VCs can be a mix of VC3, VC4, and VC4-4c
- Demaps TUG3 from VC4 and TUG2 from VC3 or TUG3
- Demaps TUs (TU11, TU12, and TU2) from TUG2
- TU type can be dynamically configured on a per TUG2 basis
- TU3 within TUG3 is also supported, as is VC11 over TU12
- Processes all TU pointers
- Including the TU3 pointer for TU3 over TUG3
- Extracts all lower-order path overhead
- Verifies BIP-2 calculations (B3 in the case of TU3 over TUG3). VC settings may be dynamically reconfigured on a per VC basis
- Demaps PDH from VC and TU payloads
- All mappings for TU11, TU12, TU2, VC3, and VC4 are supported
- Demapping type may be dynamically configured on a per-TU/VC basis
- Provides a multi-channel output of up to 336 TUs (TU11 over STM-4)
- Plugs directly into SDH deframer core for a complete SDH solution
- Also plugs into PDH deframer cores (E1/T1 and E3/T3)
Block Diagram
Figure 1 shows a block diagram of the function.
Figure 1. Block Diagram
 Click for full detail (49 KB)
Description
Aliathon STM-0/1/4 (STS-1/3/12) Demapper core provides a flexible, resource-efficient, programmable logic based solution for SONET/SDH interfaces. The core supports all mappings (e.g., 336 TU11's in STM-4, 3 TU3's in STM-1, or any combination) and may be dynamically switched between any of the mappings. The core is supported for Stratix® II, Stratix GX, and Cyclone™ FPGAs.
Device Utilization & Performance
Table 1 lists the typical device utilization for the megafunction.
| Table 1. Typical Device Utilization for the Megafunction |
| Target Device |
Speed Grade |
Utilization |
Performance
(fMAX) |
Parameter
Setting |
| LEs (1) |
ESBs (2) |
| Cyclone |
-7 |
1,987 |
- |
100+ MHz |
Contact Aliathon |
| Stratix |
-7 |
2,007 |
- |
90+ MHz |
Contact Aliathon |
| Stratix II |
-5 |
1,049 |
- |
100+ MHz |
Contact Aliathon |
Notes:
-
LEs = Logic elements. The LE count for Stratix II devices is based on the number of adaptive look-up tables (ALUTs) used for the design as reported by the Quartus® II software.
-
ESBs = Embedded system blocks
Contact Information
For additional information, contact Aliathon at:
Evans Business Centre
Pitreavie Court
Dunfermline
Fife KY11 8UU
United Kingdom
Tel: +44 (0) 1383 737736
Fax: +44 (0) 1383 749501
E-mail: info@aliathon.com
URL: www.aliathon.com
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