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| 型號(hào)： | 24945 |
| 英文描述： | Implementing SDLC on the Am186CC or Am186CH Microcontroller Application Note? 76.1KB (PDF) |
| 中文描述： | 實(shí)施的SDLC的Am186CC或Am186CH微控制器應(yīng)用筆記？ 76.1KB（PDF格式） |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 76K |
| 代理商： | 24945 |
Implementing SDLC on the Am186CC or Am186CH Microcontroller
4
FM0 (Biphase Space)
In FM0 encoding, also known as biphase space, a tran-
sition is present on every bit cell boundary, and an ad-
ditional transition may be present in the middle of the
bit cell. In FM0, a 1 bit is sent as no transition in the cen-
ter of the bit cell, and a 0 bit is sent as a transition in the
center of the bit cell. FM0 encoding data contains suffi-
cient information to recover a clock from the data.
FM1 (Biphase Mark)
In FM1 encoding, also known as biphase mark, a tran-
sition is present on every bit cell boundary, and an ad-
ditional transition may be present in the middle of the
bit cell. In FM1, a 0 bit is sent as no transition in the cen-
ter of the bit cell, and a 1 bit is sent as a transition in the
center of the bit cell. FM1 encoded data contains suffi-
cient information to recover a clock from the data.
Manchester
Manchester encoding always produces a transition at
the center of the bit cell. If the transition is High-to-Low,
the bit is a 1; if the transition is Low-to-High, the bit is a
0. Manchester encoded data contains sufficient infor-
mation to recover a clock from the data. Manchester
encoding is used in 10-Mbit/s Ethernet.
Digital Phase-Locked Loop (DPLL)
Many communication controllers (like the Am85C30,
MC68360, and all 10 Mbit/s Ethernet controllers) have
a DPLL that can be used to recover clock information
from a data stream with NRZI, FM or Manchester en-
coding. The data stream encoded in these ways con-
tains sufficient information to recover a clock from the
data.
Advantage and Drawback
The advantage of encoding mechanisms that include
sufficient clock information (e.g., NRZI, FM, and
Manchester) is that clock information can be recovered
from the data stream so a separate clock is not needed.
Therefore, the number of wires for transmission is min-
imized. However, FM and Manchester encoding have a
drawback in that the worst-case signaling rate is twice
the data rate.
Encodings Supported by the Am186CC and
Am186CH Microcontrollers
The Am186CC and Am186CH microcontrollers sup-
port NRZ and NRZI encoding. They do not support
FM0, FM1, and Manchester encoding. These micro-
controllers do not have a DPLL, therefore they cannot
recover clock information from an NRZI data stream.
When NRZI is used and there is no separate clock ac-
companying the data stream, these microcontrollers
need an external DPLL to retrieve a clock signal from
the received data. This clock will be used for both re-
ceiving and transmitting.
SUMMARY
The HDLC controller in the Am186CC and Am186CH
microcontrollers supports all the bit manipulation of the
SDLC protocol. Whether or not these microcontrollers
can be used in an SDLC environment depends on what
method of encoding is used.
Trademarks
AMD, the AMD logo, and combinations thereof, and Am186 are trademarks of Advanced Micro Devices, Inc.
Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
Disclaimer
The contents of this document are provided in connection with Advanced Micro Devices, Inc. (“AMD”) products. AMD makes no representations
or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to speci-
fications and product descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any in-
tellectual property rights is granted by this publication. Except as set forth in AMD's Standard Terms and Conditions of Sale, AMD assumes no
liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of
merchantability, fitness for a particular purpose, or infringement of any intellectual property right.
AMD's products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the
body, or in other applications intended to support or sustain life, or in any other application in which the failure of AMD's product could create a
situation where personal injury, death, or severe property or environmental damage may occur. AMD reserves the right to discontinue or make
changes to its products at any time without notice.
Table 2.
Encoding Support
Encoding Method
Supported by Am186CC and
Am186CH Microcontrollers
NRZ
Yes
NRZI with separate
clock
Yes
NRZI without
separate clock
Yes, but only with external DPLL
FM0 or FM1
No
Manchester
No
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