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參數(shù)資料
| 型號： | TLK2201AIRCPR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ETHERNET TRANSCEIVERS |
| 中文描述： | 以太網(wǎng)收發(fā)器 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大小： | 343K |
| 代理商： | TLK2201AIRCPR |
TLK2201A, TLK2201AI
ETHERNET TRANSCEIVERS
SLLS572
–
JUNE 2003
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
receiver word alignment
These devices use the IEEE 802.3 Gigabit Ethernet defined 10-bit K28.5 character (comma character) word
alignment scheme. The following sections explain how this scheme works and how it realigns itself.
comma character on expected boundary
These devices provide 10-bit K28.5 character recognition and word alignment. The 10-bit word alignment is
enabled by forcing the SYNCEN terminal high. This enables the function that examines and compares serial
input data to the seven bit synchronization pattern. The K28.5 character is defined by the 8-bit/10-bit coding
scheme as a pattern consisting of 0011111010 (a negative number beginning with disparity) with the 7 MSBs
(0011111), referred to as the comma character. The K28.5 character was implemented specifically for aligning
data words. As long as the K28.5 character falls within the expected 10-bit boundary, the received 10-bit data
is properly aligned and data realignment is not required. Figure 2 shows the timing characteristics of RBC0,
RBC1, SYNC and RD0
–
RD9 while synchronized. (Note: the K28.5 character is valid on the rising edge of
RBC1).
comma character not on expected boundary
If synchronization is enabled and a K28.5 character straddles the expected 10-bit word boundary, then word
realignment is necessary. Realignment or shifting the 10-bit word boundary truncates the character following
the misaligned K28.5, but the following K28.5 and all subsequent data is aligned properly as shown in
Figure 5. The RBC0 and RBC1 pulse widths are stretched or stalled in their current state during realignment.
With this design the maximum stretch that occurs is 20 bit times. This occurs during a worst case scenario when
the K28.5 is aligned to the falling edge of RBC1 instead of the rising edge. Figure 5 shows the timing
characteristics of the data realignment.
DXX.X
K28.5
DXX.X
DXX.X
K28.5
K28.5
DXX.X
DXX.X
DXX.X
DXX.X
DXX.X
K28.5
DXX.X
DXX.X
K28.5
K28.5
DXX.X
DXX.X
31 Bit
Times
Max Receive
Path Latency
Worst Case
Misaligned K28.5
Misalignment Corrected
INPUT DATA
RBC0
RBC1
RD(0
–
9)
SYNC
Corrupt Data
30 Bit
Times (Max)
Figure 5. Word Realignment Timing Characteristics Waveforms
Systems that do not require framed data may disable byte alignment by tying SYNCEN low.
When a SYNC character is detected, the SYNC signal is brought high and is aligned with the K28.5 character.
The duration of the SYNC pulse is equal to the duration of the data when in TBI mode. When in DDR mode the
SYNC pulse is present for the entire RBC0 period.
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參數(shù)描述 |
|---|---|
| TLK2201AIRCPRG4 | 功能描述:以太網(wǎng) IC 1.0 to 1.6 Gbps Gb Ethernet Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| TLK2201AJR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.0Gb to 1.6Gb SMALL FORM-FACTOR ETHERNET TRANSCEIVER |
| TLK2201AJRGQE | 功能描述:以太網(wǎng) IC 1.0 to 1.6 Gbps Ethernet Trnscvr RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| TLK2201AJRZQE | 功能描述:以太網(wǎng) IC 1.0-1.6 Gbps Gigabit Ethernet Trncvr RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| TLK2201ARCP | 功能描述:以太網(wǎng) IC 1.0 to 1.6 Gbps Gb Ethernet Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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