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參數(shù)資料
| 型號(hào)： | IBM42M10LNYAA10 |
| 廠商： | IBM Microeletronics |
| 英文描述： | 1063 MB/S Gigabit Link Module(1063 MB/S 吉位連接模塊（高性能集成光纖收發(fā)器）) |
| 中文描述： | 1063 MB / s的千兆連接模塊（1063 MB /秒吉位連接模塊（高性能集成光纖收發(fā)器）） |
| 文件頁數(shù)： | 9/26頁 |
| 文件大小： | 436K |
| 代理商： | IBM42M10LNYAA10 |
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IBM42M10SNYAA20
IBM42M10LNYAA10
1063Mb/s Gigabit Link Module - No OFC
GLM1063N.02
11/10/99
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 9 of 26
Lock to Reference Timings:
The GLM specification for the minimum required Lock To Reference time is 500
ν
s. Under certain conditions
this minimum required time can be reduced to 120
ν
s. The following paragraph describes under what condi-
tions this reduced lock time is met.
The frequency of the receiver PLL needs to be in close proximity to the frequency of the incoming data in
order to attain phase lock on the data. To do this, the Transmit Byte Clock is applied to receiver IC module
through a separate pin. The Lock To Reference pin toggles whether the receiver PLL phase locks to the
incoming data stream or to the Transmit Byte Clock. Whenever the Link Unusable line goes high and the
Enable EWrap line is low, the receiver PLL switches to frequency lock onto the Transmit Byte Clock. When
the Enable EWrap line is high, the receiver PLL stays locked to the incoming data stream even when the Link
Unusable line goes high. This process achieves Lock To Reference times as short as 120
ν
s.
Enable Comma Detect (En_CDet)
This signal activates the Comma Detect function described in Comma Detect (Com_Det) on page 6. When
this line is high, the Comma Detect line will strobe and the Receive Byte Clocks will be reset when a K28.5
character is received.
Enable Wrap (EWrap)
This signal causes the serializer to wrap the Transmit Data to the deserializer and turn off the laser within
20
ν
s. As a result, the link goes down and the Link Unusable line is driven high.
This sequence causes the PLL to lose bit synchronization making it necessary to cycle the Lock to Reference
line after the Link Unusable line indicates the link is active.
The wrap function on the GLM can be used to improve fault isolation. When the Enable Wrap line is driven
high, the data that would normally have been transmitted on the fiber is rerouted to the receiver. The same
Lock to Reference sequence used for optical data must be used to lock to the received data. When the Lock
to Reference sequence is completed, the data written to the transmit data lines can be read from the Receive
Data lines.
This function is useful to determine whether the GLM is correctly seated in the electrical connector. If the
GLM functions correctly in wrap mode, it is likely that any fault would be in the optical path.
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