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參數(shù)資料
| 型號(hào)： | IBM42M10SCYAA10 |
| 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)： | 11/31頁 |
| 文件大?。?/td> | 511K |
| 代理商： | IBM42M10SCYAA10 |
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IBM42M10SCYAA10
IBM42M10LCYAA20
1063Mb/s Gigabit Link Module
glm1063.02.fm.02
Feb. 15, 2000
Page 11 of 30
Link Unusable (L_Unuse)
This signal is driven by the OFC module. When this line is high it indicates that the fiber path is open and the
OFC module is pulsing the laser at a low duty cycle. The Link Unusable line goes high within 650
μ
s of the
disruption of the incoming received signal.
Link Acquisition Sequence: The following 6-step sequence should be followed to get the GLM in full synchro-
nization with a companion card undergoing a similar sequence. This sequence will also work with a single
card when using an optical wrap connector.
1. Power up the GLM. The Transmit Byte Clock should be running as defined in Transmit Byte Clock (TBC)
on page 13.
2. The OFC will drive the Link Unusable line to a high state indicating that its receiver is not detecting any
signal from the link. Having the Link Unusable line in the high state does not assure that the OFC is oper-
ational. This is a necessary but not a sufficient condition.
3. Drive the Transmit Data lines to a 01010101010101010101. (This speeds up the synchronization process
and assures that the Comma Detect line will not pulse randomly on the companion card during the
remainder of this sequence.)
4. Drive the input control lines as follows:
1. Enable Wrap: low (will not be changed)
2. Enable Comma Detect: high (will not be changed)
3. Lock to Reference: high
If a link is properly connected and the companion card is in an equivalent state of readiness, the laser will
turn on in 10.1 seconds as indicated by the Link Unusable line going low. This transition indicates that the
OFC is indeed operational and in control.
4. After the laser has come on, bring Lock to Reference low for at least 500
μ
s. See Lock to Reference
(Lck_Ref) on page 13.
5. Bring the Lock to Reference high.
After 2500 bit times (2.4
μ
s), the GLM should be in bit synchronization (the internal clocks are aligned to
the incoming bit stream), but not yet byte synchronization (the byte is aligned along the same boundary it
had when sent from the companion system to the companion GLM prior to serialization). The Receive
Byte Clock frequency should now be running at 53.125MHz (the frequency of the companion Transmit
Byte Clock) and the Comma Detect line is ready to indicate reception of the Comma Character.
6. Drive the Transmit Data lines with a K28.5 (Byte Sync) character.
As soon as the GLM receives the K28.5 character from the other side of the link, the clocks will align to the
byte boundary and all the Receive Data lines will have valid data. This will be indicated by the activation of the
Comma Detect line (see Receive Section on page 4).
Fault (Fault)
Upon sensing an improper power level in the laser driver, the GLM sets this signal high and turns off the laser
within 20
μ
s.
The GLM specification [2] requires that the Fault line be reset by toggling the EWRAP signal. The GLM,
however, resets the Fault line only after it has determined that the laser is operating correctly. Per Open Fibre
Control requirements, the laser will only be turned on every 10.1 seconds until the link is established.
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