ETC AHAG709D

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PRODUCT BRIEF
AHA G709D-10 FEC Core
10 GB/S ITU G.709
REED-SOLOMON DECODER
The G709D-10 core implements the 16 block
interleaved RS(255,239) code specified by in
Annex A of the ITU G.709 standard.
The G709D-10 core is specifically designed to
efficiently perform the Reed-Solomon decoding
function specified by the standard. The core
requires no configuration, no initialization, and no
re-synchronization procedure or includes any
unnecessary features that would add area, power or
complexity to your design.
A G709E Reed-Solomon encoder core is also
available from AHA.
• ITU G.709 compatible Reed-Solomon core
• Input and output data streams are blockinterleaved for seamless connection in G.709
system
• 10 Gbits/sec operation in 0.18µ CMOS process
• 140 Kgates in 0.18µ using a typical standard cell
library
• Less than 100 mA of dynamic current in UMC's
0.18µ CMOS process
• One-edge, one-clock fully synchronous design
without multi-cycle paths
• Separate FIFO for increased flexibility and
simplified IC floor planning
• Complete error reporting for Bit Error Rate
calculation and feedback into threshold detection
circuits
AHA G709D-10 FEC
correct_to_zero[10:0]
correct_to_one[10:0]
reset
clk
status_valid
start
AHA G709D-10 FEC
decode_complete
uncorrectable[15:0]
received_data[63:0]
decoded_data[63:0]
FIFO – 64 Kbit
(available from AHA)
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fifo_data[63:0]
Figure 1:
FEATURES
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INPUT SIGNALS
DELIVERABLES
clk - 166 MHz core clock. All inputs are registered
on the rising edge.
reset - Synchronous reset.
received_data[63:0] - Received data bus. Data bus
is valid every clock and is registered on the
rising edge of clk. The data frame is restarted
whenever start is active. The core accepts 8bytes per transfers
start - Signal is active to when the first 8 bytes of
the G.709 frame in on the received_data bus.
Must be inactive on all other data transfers in
the frame. Maybe asserted at anytime of the
data frame needs to be reset to the first transfer.
fifo_data[63:0] - FIFO data. Delay version of the
received_data data stream. The bus is
registered on the rising edge of clk.
• G.709D-10 FEC core (VHDL)
• Timing constraints (DesignCompiler and Ambit
format)
• Test bench and verification vectors (VHDL)
• Single use license to AHA’s Reed-Solomon
patents
OUTPUT SIGNALS
decode_complete - Decoding complete. Active
when the first 8-byte transfer of the G.709
frame is on the decode_data data bus and
inactive on all subsequent transfers.
decoded_data[63:0] - Decoded data. The first 8bytes of the corrected G.709 frame are valid
when decode_complete is active and the
remainder of the frame is available over the
subsequent 509 clocks. The data is driven from
the rising edge of clk.
status_valid - Status valid signal. Active for a
single clk following the completion of the
frame to indicate when the uncorrectable,
correct-to-zero, and correct_to_one signals
are valid.
uncorrectable[15:0] - Uncorrectable block flags.
Each bit of the signal corresponds to one of the
16 Reed-Solomon blocks in the G.709 frame.
Valid when status_valid is active.
correct_to_zero[10:0] - Number of bits corrected
from ‘1’ to ‘0’ in the just completed G.709
frame. Signal is valid when status_valid is
active.
correct_to_one[10:0] - Number of bits corrected
from ‘0’ to ‘1’ in the just completed G.709
frame. Signal is valid when status_valid is
active.
PATENTS
Design uses one or more of the following US
Patents: 5,170,399; 5,099,482; 4,873,688;
5,396,502
ABOUT AHA
Comtech AHA Corporation (AHA) develops
and markets superior integrated circuits, boards,
and intellectual property core technology for
communications systems architects worldwide.
AHA has been setting the standard in Forward Error
Correction and Lossless Data Compression
technology for many years and provides flexible,
cost-effective solutions for today’s growing
bandwidth and reliability challenges. Comtech
AHA Corporation is a wholly owned subsidiary of
Comtech Telecommuncations Corp. (NASDAQ:
CMTL). For more information, visit www.aha.com.
comtech aha corporation
A subsidiary of Comtech Telecommunications Corporation
1126 Alturas Drive
Moscow, ID 83843-8331
tel: 208.892.5600
fax: 208.892.5601
e-mail: sales@aha.com
www.aha.com
PBG709D10_0203
© 2005 Comtech AHA Corp.