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| 型號(hào)： | IBM32NPR101EPXCAC133 |
| 英文描述： | Microprocessor |
| 中文描述： | 微處理器 |
| 文件頁(yè)數(shù)： | 27/131頁(yè) |
| 文件大小： | 1679K |
| 代理商： | IBM32NPR101EPXCAC133 |
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PRS28.4G
IBM Packet Routing Switch
prs28.03.fm
August 31, 2000
Functional Description
Page 27 of 131
During serialization and deserialization, a one byte stream is split into two bit streams, one carrying the even
bits, and the other the odd bits. Thus, a port consists of four differential pairs. The information and bit order
that each pair carries is given in the table below.
Note:
The MASTER stream is carried by bits 2 and 3, and the SLAVE stream by bits 0 and 1.
This bit grouping guarantees bit transitions to perform the phase alignment during synchronization on SYNC
packets.
3.1.2 Packet Type
A packet can be one of the following types:
A Data Packet that contains user data to be switched from input to output.
A Control Packet that is used to communicate with the local processor.
An Idle Packet that does not contain user data. Idle Packets are sent on a link when no data packet are
available, or to perform link synchronization.
3.1.2.1 Data Packets and Control Packets
Data Packets carry user data and Control Packets carry information for local processor communication. The
figure
Packet Format 1.77 Gb/s Port
on page 25 shows the format of a data and control packet without speed
expansion. A packet consists of 16-bit words, divided into a master stream and a slave stream.
The figure
Packet Format for 3.54 Gb/s Port
on page 25 shows the Data and Control Packet format with
speed expansion, either internal or external. In those configurations, the packet is transported over two
different ports, either in the same device or in separate devices, in four LUs. The master port receives the
master LU and a slave LU, and the slave port receives two slave LUs.
Data Packets have a priority that ranges from 0 (highest) to 3 (lowest). In addition, they also carry filtering
(color) information used for switchover support.
Control Packets do not have priority, but they carry filtering (color) information.
Table 2: Physical Bit Organization of a Port
Differential Pair
Information Carried
Bit Order
Data_0_Q and Data_0_QN
even number bits of the
slave
byte stream
b0 b2 b4 b6 of
slave
byte
Data_1_Q and Data_1_QN
odd number bits of the
slave
byte stream
b1 b3 b5 b7 of
slave
byte
Data_2_Q and Data_2_QN
even number bits of the
master
byte stream
b0 b2 b4 b6 of
master
byte
Data_3_Q and Data_3_QN
odd number bits of the
master
byte stream
b1 b3 b5 b7 of
master
byte
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