DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 616

• Manufacturer Part Number: DK-DEV-4SGX230N
• Description: KIT DEVELOPMENT STRATIX IV
• Manufacturer: Altera
• Series: Stratix® IVr
• Type: FPGAr

Specifications of DK-DEV-4SGX230N

• Contents: Development Board, Universal Power Supply, Cables and Software
• Silicon Manufacturer: Altera
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Silicon Core Number: EP4S
• Silicon Family Name: Stratix IV GX
• Rohs Compliant: Yes
• For Use With/related Products: EP4SGX230K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-2594

1–172
Figure 1–139. SONET/SDH Mode
Stratix IV Device Handbook Volume 2: Transceivers
9 Rows
SONET/SDH Mode
SONET/SDH is one of the most common serial-interconnect protocols used in
backplanes deployed in communications and telecom applications. SONET/SDH
defines various optical carrier (OC) sub-protocols for carrying signals of different
capacities through a synchronous optical hierarchy.
SONET/SDH Frame Structure
Base OC-1 frames are byte-interleaved to form SONET/SDH frames. For example, 12
OC-1 frames are byte-interleaved to form one OC-12 frame; 48 OC-1 frames are
byte-interleaved to form one OC-48 frame, and so on. SONET/SDH frame sizes are
constant, with a frame transfer rate of 125 μs.
Figure 1–139
Transport overhead bytes A1 and A2 are used for restoring frame boundary from the
serial data stream. Frame sizes are fixed, so the A1 and A2 bytes appear within the
serial data stream every 125 μs. In an OC-12 system, 12 A1 bytes are followed by 12 A2
bytes. Similarly, in an OC-48 system, 48 A1 bytes are followed by 48 A2 bytes.
In SONET/SDH systems, byte values of A1 and A2 are fixed as follows:
■
■
You can employ Stratix IV GX and GT transceivers as physical layer devices in a
SONET/SDH system. These transceivers provide support for SONET/SDH
protocol-specific functions and electrical features; for example, alignment to A1A2 or
A1A1A2A2 pattern.
NxA1
Transport Overhead
A1 = 11110110 or 8'hF6
A2 = 00101000 or 8'h28
Nx3 Bytes
NxA2 NxJ0/Z0
shows the SONET/SDH frame structure.
Nx3 Bytes
Payload
Chapter 1: Transceiver Architecture in Stratix IV Devices
February 2011 Altera Corporation
Transceiver Block Architecture