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參數(shù)資料
| 型號： | IBM42M10LCYAA20 |
| 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)： | 14/31頁 |
| 文件大?。?/td> | 511K |
| 代理商： | IBM42M10LCYAA20 |
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IBM42M10SCYAA10
IBM42M10LCYAA20
1063Mb/s Gigabit Link Module
Page 14 of 30
glm1063.02.fm.02
Feb. 15, 2000
Lock to Reference Timings:
The GLM specification for the minimum required lock-to-reference time is 500
μ
s. Under certain conditions
this minimum required time can be reduced to 120
μ
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 the Transmit Byte Clock. This process shortens the overall data locking acquisition
time. Whenever the Link Unusable line goes high and the Enable E-wrap line is low, the receiver PLL will
switch to frequency lock on to the Transmit Byte Clock. If, however, the Enable E-wrap line is high, the
receiver PLL will stay locked to the incoming data stream even when the Link Unusable line goes high. By
taking advantage of this feature, it is possible to achieve lock-to-reference times as short as 120
μ
s.
Enable Comma Detect (En_CDet)
This signal activates the Comma Detect function described in Comma Detect (Com_Det) on page 10. 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
μ
s (which results in the link going down and the Link Unusable line subsequently being driven high). If the
link is active (Link Unusable line low) prior to turning on the Enable Wrap signal, the OFC responds to the
Enable Wrap signal being brought low later by immediately initiating the
“
on-off-on
”
handshake as described
in Open Fibre Control on page 5 and shown in Fault Sequence on page 8.
This handshake causes the PLL to lose bit synchronization, making it necessary to cycle the Lock to Refer-
ence line after the Link Unusable line again indicates the link is active (see the Transmit and Lock to Refer-
ence Timings diagram on page 13).
If for any reason the companion card does not respond as shown in Fault Sequence on page 8 (e.g. the link
becomes defective), the OFC sequence will not complete on this cycle. The OFC will try again in 10.1
seconds. For example:
Assume that GLM-1 is put into wrap mode. GLM-2 detects a loss of light and activates the Link_Unusable
line. System-2 sees this as a link failure and decides to start diagnostics and similarly goes into wrap
mode. GLM-1 comes out of wrap mode and initiates the
‘
on-off-on
’
handshake. GLM-2 does not respond.
System-2 completes diagnostics and comes out of wrap mode. Since the link was not active when GLM-
2 went into wrap mode, GLM-2 will not initiate the
‘
on-off- on
’
sequence for 10.1 seconds. GLM-1 is simi-
larly waiting 10.1 seconds from when it last initiated the
‘
on-off-on
’
handshake.
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 routed to the receiver. The same Lock
to Reference sequence used for optical data must still be used to lock to the wrapped 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.
The Enable Wrap function is useful in determining whether the GLM is correctly seated in the electrical
connector. If the GLM functions correctly in wrap mode, any fault is likely to be in the optical path.
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