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| 型號： | IBM32NPR101EPXCAC133 |
| 英文描述： | Microprocessor |
| 中文描述： | 微處理器 |
| 文件頁數(shù)： | 19/131頁 |
| 文件大?。?/td> | 1679K |
| 代理商： | IBM32NPR101EPXCAC133 |
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PRS28.4G
IBM Packet Routing Switch
prs28.03.fm
August 31, 2000
Architecture
Page 19 of 131
2.1.10 Signaling
LU data is passed in and out of the island, one byte per clock cycle, for each input and output port, at a rate of
0.88 Gb/s.
The first byte of a packet, either incoming or outgoing, is called the Qualifier byte and carries information
about:
Packet priority
Packet identification
Packet filtering support
Drop flag
Parity bit over the three byte header
2.1.10.1 Idle Packets
When no Data Packets are available on a port, fill-up (empty) packets, called Idle Packets, are transmitted.
The inputs recognize these packets by their packet identification, and they are not stored. Outputs automati-
cally generate Idle Packets also, when no Control Packets or Data Packets of any priority are available.
2.1.10.2 Input
For incoming Data Packets, the second and third bytes provide the address of the packet destination, in the
form of a bit map. Each bit of these two bytes is associated with an output port. A bit set to 1 in the bit map
indicates that the packet is to be routed to the corresponding port. This bit map field can point to multiple
outputs.
An incoming packet is interpreted as a Control Packet when the entire bit map field is set to 0.
2.1.10.3 Output
The second and third bytes of outgoing packets carry the grant status of all output ports. This grant status is
used by the receiver of the other adapter to make a decision on Data Packet transmission, according to the
incoming flow control scheme presented above. This grant status is referred to as an output queue grant.
On a given packet, the output queue grant field carries the status of all logical queues of the same priority.
Consecutive packets carry the grant status for the different priorities, in a cyclic order. The synchronization of
this cycle is provided by the packet numbering field contained in the outgoing Idle Packets.
2.1.11 Internal Features
2.1.11.1 Packet Filtering
A packet filtering function is provided on the switch island inputs in order to decide whether or not to receive
packets for certain destinations. According to the packet filtering field in the qualifier byte, the incoming
packet bit map is either logically ORed with a specified mask (its complement value) or not masked at all.
There is one mask for all 16 inputs.
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