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參數(shù)資料
| 型號： | AHA4013B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 12.5 MBytes/sec Reed-Solomon Error Correction Device |
| 中文描述： | 12.5 MB /秒的Reed - Solomon糾錯裝置 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 232K |
| 代理商： | AHA4013B |
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PS4013B-0600
Page 3 of 24
Advanced Hardware Architectures, Inc.
The use of internal buffers is restricted per the
rules defined in Section 2.9
Data Rates and
Latencies
.
Maximum delay required for each block of a
given length to pass through the device is fixed, and
does not vary with the location or the number of
errors received. This delay (or latency), expressed
in the number of clocks is discussed in a later
section.
2.2
CORRECTING CAPABILITY AND
POLYNOMIALS
Compared with other codes, RS codes require
relatively few
“
overhead
”
check bytes to be added
to the data stream to achieve a high degree of error
detection and correction. Since the AHA4013B
deals with bytes (or symbols) rather than with
individual bits, when a byte is in error it does not
matter how many bits within the byte are corrupted;
it is counted as one error.
The Reed-Solomon code is defined over the
finite field GF(2
8
). The field defining primitive
polynomial is:
P(x) = x
8
+ x
7
+ x
2
+ x + 1
and the generator polynomial, dependent on the
variable R, is given by:
where R
∈
{2, 3, 4, 5,... 20} for the AHA4013B. This
polynomial is specified in international standards,
Intelsat IESS 308; RTCA DO-217 Appendix F (Rev
D) and the proposed CCITT SG-18.
For every 2 check bytes, the decoder corrects
either 2 erasures or 1 error. An erasure can be
determined with a parity detector or a signal dropout
detector external to the chip. An erasure is indicated
by the ERASE signal when the erased byte is
clocked in the device.
Correcting
“
erasures
”
takes only half as much
of the correction capability of the RS code as it takes
to correct
“
errors
”
, since the position information is
already known for
“
erasures
”
. The correction ability
of the code is bounded as:
R
≥
# erasures
+
2(# errors)
Valid block length (N) is defined by the
relationship:
R + 1
≤
N
≤
255
where R ranges from 2 to 20.
A complete codeword can therefore range from
a minimum of 3 bytes to a maximum of 255 bytes.
For further discussion on error rate
performance, refer to Section 2.10
Reed-Solomon
(ECC) Module and Error Rate Performance
.
Figure 1:
Block Diagram
Figure 2:
Typical Applications Diagram
G x
( )
x
α
i
–
(
)
i
120
=
119
R
+
∏
=
DI
INPUT BUFFER
367x9
ECC CORE
CONTROL
DO
OUTPUT BUFFER
256x9
REGISTER
RDYON
RSTN
DSIN
DSON
GND
VDD
CRTN
RDYIN
CLK
RDYIN
REGISTER
ERASE DI[7:0]
CLK
RSTN
DSIN
DSON
RDYON
CRTN
DO[7:0] ERR
VDD
GND
DATA SOURCE
AHA4013B
ECC COPROCESSOR
CHANNEL
1 TO x BITS WIDE
AHA4013B
ECC COPROCESSOR
DATA SINK
SYSTEM
CONTROLLER
SYSTEM
CONTROLLER
A
8
8
B
8
8
C
ENCODER
COMMUNICATIONS
DECODER
BLOCK FORMAT AT:
KDATA PLUS R “DUMMY” BYTES
KDATA PLUS R CHECK BYTES
KDATA BYTES
C
A
B
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