參數(shù)資料
型號(hào)： 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(cuò)裝置
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 232K
代理商： AHA4013B
PS4013B-0600
Page 9 of 24
Advanced Hardware Architectures, Inc.
sec. Note: Other frequency operations may be
derived similarly.
Output Buffer may be used to hold data from
one block while the Input Buffer is being filled with
the following block. Two rules listed in the caveats
are required to accomplish this. These are illustrated
in Figure 4.
Caveats:
1. Output of block i must start coincident with or
before the input of block i
+
1.
2. Output of block i must be complete:
Processing Latency
N
8 clocks
after the start of block i
+
l on the input.
Table 2:
Burst Operation Using 50 MHz Clock and 1 Clock/Byte, Forward Order Output
2.9.2
CONTINUOUS OPERATION
Multiple blocks of data may be processed
through the device continuously as shown in Figure
4. Consecutive blocks are input into the device at
the rate of C
i
clocks/byte. The output data stream
may or may not be continuous depending on
whether parity is being output (controlled by
NOPAR) and the choice of C
o
. Continuous
operation is described by several equations. The
following terms are used in these equations:
C
i
-
Input clock rate per byte: C
i
≥
4 for
continuous operation
C
o
-
Output clock rate per byte: C
o
≥
2
C
m
-
Minimum of C
i
and C
o
: If C
i
< C
o
then
C
m
=
C
i
else C
m
=
C
o
N
-
Reed-Solomon block length
K
-
Reed-Solomon message length
R
-
Reed-Solomon parity length (R
=
N
K)
L
-
Output data length: If parity is being output
from the chip (NOPAR
=
0), L
=
N; else if
the parity is not being output (NOPAR
=
1)
L
=
K
A. Conditions for Continuous Operation
The allowable input and output data rates are
related to the Reed-Solomon block length by the
following two inequalities. C
i
, C
o
, N and K must be
chosen so that these equations are satisfied.
Equation 1:
Equation 2:
B. Processing Latency
Processing latency is the time from the beginning
of a block on the input to the block being ready for
output. Maximum processing latency, expressed in
number of clocks, for continuous operation is:
Equation 3:
C. Start and End of Output
Similar to the burst operation, Output Buffer
may be used to temporarily
“
hold
”
data from one
block while the Input Buffer is being filled.
However, these conditions must be satisfied: the
output of a data block must start after the latency
equation (Equation 3) is satisfied, but before the
maximum delay is reached. The maximum delay is:
Equation 4:
CHECK BYTES ‘R’ = 20
MAXIMUM
LATENCY
(#of clocks)
155
230
380
530
680
845
CHECK BYTES ‘R’ = 2
MAXIMUM
LATENCY
(#of clocks)
137
212
362
512
662
827
BLOCK
LENGTHS ‘N
MAXIMUM
LATENCY
(
μ
secs)
3.10
4.60
7.60
10.64
13.60
16.88
AVERAGE
RATE
(MBytes/sec)
8.06
10.88
13.13
14.13
14.75
15.13
MAXIMUM
LATENCY
(
μ
secs)
2.74
4.24
7.24
10.24
13.28
16.56
AVERAGE
RATE
(MBytes/sec)
9.13
11.79
13.75
14.63
15.13
15.38
25
50
100
150
200
255
Average Rate
Maximum Latency
μ
sec
(
)
------------------------------N
=
R
----------------------------------------
60
N
C
m
×
1
----------–
+
+
C
i
N
367
≤
+
N
1
–
(
)
C
i
×
R
48
N
C
i
i
1
–
---------------
N
C
m
m
–
1
-----------------
+
+
+
≥
Latency
N
1
–
(
)
C
i
×
=
60
R
N
C
m
m
–
1
-----------------
+
+
+
maximum_delay
3
N
C
i
×
×
L
C
o
N
i
C
i
1
–
×
---------------
–
×
–
=
C
i
i
if maximum_delay
367, then maximum_delay
367
C
i
×
=
≥
if maximum_delay
2
N
, then maximum_delay
×
2
N C
i
×
=
>
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