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| 型號(hào)： | AM79C901AJIT |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
| 中文描述： | HomePHY單芯片的1 / 10 Mbps的家庭網(wǎng)絡(luò)物理層 |
| 文件頁(yè)數(shù)： | 32/90頁(yè) |
| 文件大?。?/td> | 714K |
| 代理商： | AM79C901AJIT |
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32
Am79C901A
P R E L I M I N A R Y
Figure 16.
HomePNA PHY Framing
HomePNA PHY Symbol Waveform
All HomePNA PHY symbols are composed at the transmit-
ter of a silence interval and a pulse formed of an integer
number of cycles (TX_PULSE_CYCLES_P/N in HPR29)
of a square wave of frequency (CENTER_FREQUENCY
TX_PULSE_WIDTH in HPR29) that has been filtered with
an external bandpass filter. Data is encoded in the time in-
terval from the preceding pulse.
Table 6.
HomePNA PHY Pulse Parameters
Time Interval Unit
HomePNA PHY time intervals are expressed in Time
Interval Clock (TIC) units. One TIC is defined as
7/60E6 seconds or approximately 116.7 ns.
Access ID Intervals
A HomePNA frame begins with an Access ID (AID) in-
terval which is composed of eight equally spaced sub-
intervals termed AID symbols 0 through 7 as shown in
Figure 17.
An AID symbol is 129 TICs long. Transmit timing is
shown in Figure 17; receive timing in Figure 18. Timing
starts at the beginning of each AID symbol at TIC = 0
and ends at TIC = 129.
These symbols are described in the following sections.
Symbol 0 (SYNC interval)
SYNC Transmit Timing
: The SYNC interval (AID sym-
bol 0) delineates the beginning of a HomePNA PHY
frame and is composed of a SYNC_START pulse, fol-
lowed by a SYNC_END pulse, after a fixed silence in-
terval as shown in Figure 17. Timing for this (AID
symbol 0) starts (TIC = 0) at the beginning of the
SYNC_START pulse. The SYNC_END pulse starts at
TIC = 126.
At TIC = 129, this AID symbol 0 ends and the next AID
symbol begins, with the symbol timing reference reset
to TIC = 0. No information bits are coded in the SYNC
(AID symbol 0 interval).
SYNC Receive Timing
: As soon as the SYNC_START
pulse is detected the receiver disables (blanks) further
detection until time TIC = 61, after which detection is
re-enabled for the next received pulse. The receiver al-
lows for jitter by establishing a window around each
legal pulse position. This asymmetrical window is two
TICS wide on one side of the position and one TIC wide
on the other.
A SYNC_END pulse that arrives outside the window of
the legal TIC = 126 is considered a noise event which
is used in setting the adaptive squelch level, aborts the
packet, and sets the receiver in search of a new
SYNC_START pulse and SYNC interval. If it is a trans-
mitting station, the COLLISION event is asserted as
described in the
Collisions
section.
SYNC
interval
Access ID
Silence
PCOM
4
So 6
Dest6
Le2
ETHERNET MAC and DATA
max 1500
CRC
4
32 bits
PCOM
Ethernet Packet
Fixed
14.93
μ
s
AID
blanking
interval
AID
blanking
interval
AID
blanking
interval
AID
blanking
interval
AID
blanking
interval
AID
blanking
interval
01
11
10
00
01
00
60 tics
129 tics
129 tics
129 tics
129 tics
129 tics
129 tics
129 tics
Data
symbols
20 tics
66 tics
Silence
interval
SYNC
Symbol 0
ACCESS
ID Symbol
1
ACCESS
ID Symbol
2
ACCESS
ID Symbol
3
ACCESS
ID Symbol
4
ACCESS
ID Symbol
5
ACCESS
ID Symbol
6
ACCESS
ID Symbol
7
30.75
μ
s
@ 1 Mbps
ACCESS ID interval
Fixed 120.39
μ
s
Example Access ID of 01110100 and control word 0100
HomePNA PHY Header
151.14
μ
s @ 1 Mbps
1 Tic = 116.6667 ns
= receiver blanking interval
HomePNA Header
Ethernet Packet
pulse
129 tics
potential
pulse position
22304B-18
Note
: Using default configurations.
Parameter
Value
Tolerance
Unit
CENTER_FREQUENCY
7.5
500 PPM
MHz
CYCLES_PER_PULSE
4
–
Cycles
相關(guān)PDF資料 |
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| AM79C901AVC | HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
| AM79C901AVCT | HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
| AM79C901AVI | HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
| AM79C901AVIT | HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
| AM79C90 | CMOS Local Area Network Controller for Ethernet (C-LANCE) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C901AVC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
| AM79C901AVC/w | 制造商:Advanced Micro Devices 功能描述:79C901AVC/W |
| AM79C901AVC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C901AVC\W | 制造商:Advanced Micro Devices 功能描述:PHY 1-CH 1Mbps/10Mbps 80-Pin TQFP |
| AM79C901AVCT | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:HomePHY Single-Chip 1/10 Mbps Home Networking PHY |
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