Intel IXP2400 User Manual page 64

IXP2400/IXP2800 Network Processors
Developer Workbench
Low water mark
High water mark
Interpacket gap (nsec)
Number of bytes the device strips from end of packet
Number of bytes of zeros the device appends to packet
Number of extra bytes
Device Removal:
To remove a device from the project:
1. On the Simulation menu, click System Configuration, then click the MSF Devices tab.
The MSF Devices property sheet appears.
2. Select a device that you want to remove. Previously created devices appear in the list box
under the Create button. You can select one by clicking anywhere in the row listing.
3. Click Delete Device.
Port Characteristics Edit:
To edit an individual port's characteristics:
1. On the Simulation menu, click System Configuration, then click the MSF Devices tab.
The MSF Devices property sheet appears.
2. In the Port section of the property sheet, select the port that you want to modify, click the Edit
Port ... button, and the Edit Port dialog opens (see
3. When you have finished editing the port, click OK.
Any changes that you have made now appear in the corresponding column of the edited port.
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See High water mark, below.
If flow control is enabled, the high water mark is used to determine if the
device is "Hungry" or "Satisfied". If the number of bytes in the Tx buffer
is between the low and high water marks, then the device tells the
network processor that it is Hungry. If the number of bytes is above the
high water mark, then the device tells the network processor that it is
Satisfied.
Specifies the amount of time between packets when receiving packets
from and transmitting packets to the network.
Specifies the number of bytes that the device must strip from the end of
each received packet before the packet is passed to the Network
Processor. For example, for POS IP packets, the trailing checksum bytes
are normally stripped.
Specifies the number of bytes of zeroes the device appends to the packet
before it is transmitted by the Network Processor.
Specifies the number of bytes that are stripped from the beginning of the
packet before it reaches the device and appended to the beginning of the
packet after it leaves the device, for example the Ethernet preamble.
Note that no bytes are actually stripped or appended to the packet data.
Instead, the number of extra bytes are added into the calculation of data
rate at the network.
Figure 11).
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