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| 型號： | IBM42M10SNYAA20 |
| 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)： | 6/26頁 |
| 文件大小： | 436K |
| 代理商： | IBM42M10SNYAA20 |
IBM42M10SNYAA20
IBM42M10LNYAA10
1063Mb/s Gigabit Link Module - No OFC
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 6 of 26
GLM1063N.02
11/10/99
In most applications, it is assumed that the byte sync character will be transmitted on Tx[00:09]. If the byte
sync is transmitted on Tx[10:19], it will still be received on Rx[00:09].The Comma Character must always be
sent on the even boundary. (Fibre Channel requires word boundaries.)
Comma Detect (Com_Det)
This signal is driven high for one cycle whenever a Comma Character is detected by the deserializer; the
Receive Byte Clocks are also reset. The Comma Character (K28.5) is described in [3].
This function is referred to in the Fibre Channel standard [1] as
byte alignment
. The K28.5 Comma Character
is defined with two polarities. The GLM only detects the polarity shown in the Comma Character Description
table below.
When the Enable Comma Detect line is high, the Receive Byte Clocks and the byte boundary are aligned
upon receiving a Comma Character. In some applications, including Fibre Channel, this Comma Detect char-
acter is sent out frequently. Many of these applications wish to (re)align the byte boundary relative to the
Receive Byte Clocks whenever a Comma Character is received (Enable Comma Detect line is kept high).
One of the disadvantages of this approach is that in the event of a bit error there is a possibility that a Comma
Character will be created and the OLM will change its byte boundary and thereby cause all subsequent data
to be erroneous until the next Comma Character is received. The decision to keep the Enable Comma Detect
line high should be based on the user’s application.
One oddity with the current Comma Detect function is that a low Enable Comma Detect only quits detecting a
Comma Character after one has been received.
If there is no modulated light into the receiver or the PLL is out of lock for some other reason, the Comma
Detect line will pulse randomly.
The Comma Detect function can be disabled with the Enable Comma Detect input signal. This is described in
Enable Comma Detect (En_CDet) on page 9.
The Comma Detect function will not operate properly if a stream of Comma Characters is transmitted.
Comma Character Description
Data Bits
Rx00
Rx01
Rx02
Rx03
Rx04
Rx05
Rx06
Rx07
Rx08
Rx09
8B/10B Designation
1
a
b
c
d
e
i
f
g
h
j
Logic Level
0
0
1
1
1
1
1
X
X
X
1. The alphabetical notation (a, b, c, d, e, i, f, g, h, j) conforms to the 8B/10B code description in [3], but is not used in this document
because of the confusion frequently caused by these alpha characters being out of alphabetical order.
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