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| 型號(hào)： | IBM32NPR100EXXCAB133 |
| 英文描述： | Microprocessor |
| 中文描述： | 微處理器 |
| 文件頁數(shù)： | 31/131頁 |
| 文件大小： | 1679K |
| 代理商： | IBM32NPR100EXXCAB133 |
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PRS28.4G
IBM Packet Routing Switch
prs28.03.fm
August 31, 2000
Functional Description
Page 31 of 131
Data Packets will be transmitted in order of priority. A Control Packet is always transmitted before Data
Packets.
3.2.1.3 Active and Backup Bits
The Active and Backup bits are used to determine how the Bit Map Filter Mask is applied to the Bit Map Desti-
nation Address (header bytes H1 and H2) and to determine the traffic type (Red or Blue) of Data Packets.
The Bit Map Filter is a programmable register. The resulting masked destination bit map is used by the
PRS28.4G to route the packets to the appropriate destination(s), or to ignore the packet if the resulting bit
map is all zeros. Control Packet detection is performed before the Bit Map Filter is applied to the bit map
contained in the packet header.
3.2.1.4 Drop Bit
Incoming packets with the drop bit set will be dropped by the PRS28.4G when the number of packets in the
destination output queue and/or the shared memory has exceeded the programmable thresholds for the
corresponding priority. For multicast packets, the packet is dropped only if the shared memory threshold is
crossed. The output queue full information is updated once every sequencer cycle, so all input controllers see
the same output queue status in within a cycle.
When the drop bit is clear, the packet will not be dropped by the PRS28.4G due to either output queue or
shared memory thresholds.
3.2.1.5 Grant Priority Bits
The grant priority bits are defined only for Idle Packets transmitted by the PRS28.4G. For received packets,
this field is not examined (its value is ‘xx’). For transmitted packets, these bits encode the content of a fly
wheel counter, which characterize the priority of the inband output queue grant information (see next section)
stored in header bytes H1 and H2. The coding of bits gg is identical to the Data Packet priority listed in s
above.
Table 6: Data Packet Priority
(Ignored for Control Packets)
Priority Bits (p p)
Priority Level
0 0
Highest
0 1
Medium-high
1 0
Medium-low
1 1
Lowest
Table 7: Bit Map Filter
Active Bits
Backup Bits
Bit Map Filter
Data/Control Packet Color
0
0
Idle Packet.
n/a
0
1
Packet bit map is bit wise ANDed with bit wise complement of bit
map filter.
red
1
0
Packet bit map is bit wise ANDed with bit map filter.
red
1
1
Packet bit map is used unfiltered.
blue
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