參數(shù)資料
型號(hào)： AM79C901AVI
廠商： ADVANCED MICRO DEVICES INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： HomePHY Single-Chip 1/10 Mbps Home Networking PHY
中文描述： DATACOM, ETHERNET TRANSCEIVER, PQFP80
封裝： PLASTIC, MO-136BAM, TQFP-80
文件頁(yè)數(shù)： 36/90頁(yè)
文件大?。?/td> 714K
代理商： AM79C901AVI
36
Am79C901A
P R E L I M I N A R Y
Data Symbol RLL25 Encoding
The RLL25 code is the version of TM32 that was devel-
oped for the HomePNA PHY. It produces the highest bit
rate for a given value of ISBI and TIC size. In a manner
similar to run length limited disk coding, RLL25 en-
codes data bits in groups of varying sizes, specifically:
3, 4, 5, and 6 bits. Pulse positions are assigned to the
encoded bit groups in a manner, which causes more
data bits to be encoded in positions that are farther
apart. This keeps both the average and minimum bit
rates higher.
Data symbol RLL25 codes data by traversing a tree as
illustrated in Figure 21. Assuming that successive data
bits are encoded and labeled A, B, C, D,
…
, etc., the en-
coding process begins at the root node and proceeds
as follows:
1. If the first bit (bit A) is a one, the next three bits (B, C,
and D) select which one of the eight positions 1-8 is
transmitted. The encoding process then continues at
the root node.
2. If bit A is a zero and bit B is a one, the next three bits
(C, D, and E) select which one of the eight positions
9-16 is transmitted. The encoding process then
continues at the root node.
3. If bit A is a zero, bit B is a zero, and bit C is a one, the
next three bits (D, E, and F) select which one of the
eight positions 17-24 is transmitted. The encoding
process then continues at the root node.
4. Finally, if bits A, B, and C are all zeros, position 0 is
transmitted. The encoding process then continues
at the root node.
As a result, Symbol 0 encodes the 3-bit data pattern
000, positions 1-8 encode the 4-bit data pattern 1BCD,
positions 9-16 encode the 5-bit data pattern 01CDE,
and positions 17-24 encode the 6-bit data pattern
001DEF. If the data encoded is random, 50% of the po-
sitions used will be for 4-bit patterns, 25% will be for 5-
bit patterns, 12.5% will be for 6-bit patterns, and 12.5%
will be for 3-bit patterns.
Mode Interface
The HomePNA PHY may be managed from either of two
interfaces (the managed parameters vary depending on
the interface):
1. Remote Control-Word management commands
embedded in the HomePNA AID header on the
wire network.
2. Management messages from a local management
entity.
Figure 21.
RLL 25 Coding Tree
C
D
These select position 1 - 8
A
B
E
F
Awaiting coding and transmission
Encoded and sent
Start: Examine the next
bits to be encoded
C
D
1
B
These select position 9 - 16
C
D
0
1
E
These select position 17- 24
1
D
0
0
E
F
0
0
0
A =
B =
C =
1
1
1
1
0
0
0
Send symbol 1-8
Send symbol 9-16
Send symbol 17-24
Send symbol 0
Data stream from MAC controller
22304B-23
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參數(shù)描述
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AM79C90JC 制造商:Rochester Electronics LLC 功能描述:
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