ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 92

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

IBM3206K0424
IBM Processor for Network Resources
Packet/AAL5 Field Definitions
Packet Header
Page 92 of 676
1. Software should set up this field.
useCrcNumHead
numHeadBytes
tmpCongestion
cutThruThresh
dmaedHeader
headerThresh
packHeadSel
dropNBytes
Field Name
rtoEnable
routedLcd
oamMask
numDesc
tmpCLP
crcState
rtoTest
buffPtr
This is the reassembly timeout processing test-and-set bit. It is used by the IBM3206K0424 but should
be initialized to ‘0’.
If set, reassembly processing is enabled for this LC, if the LC is running AAL5.
Used by the IBM3206K0424 to track the current state of the ORed CLP bit for the current AAL5
packet. This field should be set to ‘0’ at initialization. After initialization, the IBM3206K0424 maintains
this field.
Used by the IBM3206K0424 to track the current state of the ORed congestion bit for the current AAL5
packet. This field should be set to ‘0’ at initialization time.
Specifies how much data should be received before poping a packet start event. If it is set to ‘0’, only
complete packet events will be popped.
This field is used by the IBM3206K0424, but should be initialized to zero by software. This field is used
to track the current packet under reassembly.
This field is used by the IBM3206K0424 to maintain the CRC residue as the current packet is reas-
sembled. It should be initialized to ‘0’.
When routing cells, this field is used to fill in the LCD field of the packet header. This allows the user to
dynamically route cells back out the interface using a different LCD. The user should be sure to set the
free on transmit bit in this field as if it were in a packet header.
This is used by the IBM3206K0424 for cut-through Mode 7 processing. This should be initialized to ‘0’.
Specifies which packet header should be used for this connection. See RXAAL Packet Header Config-
uration on page 352 for more information.
Specifies how OAM traffic should be filtered. See ATM OAM Cell Processing on page 322 for more
information.
When set, specifies that receive CRC will determine how many bytes to use for numHeadBytes. This
is useful when a connection is carrying IP traffic, and the TCP/IP header lengths can be determined.
Specifies how many bytes of data should be kept with the packet header when DMAing the final DMA
list for a completed scatter packet. Must be less than the page size.
Allows 0 - 31 bytes of packet data to be dropped from the beginning of the packet on POS-PHY net-
works.
Used to determine how much cut-through data is DMAed.
This is used by theIBM3206K0424 for scatter processing, and should be initialized to ‘0’.
Field Description
pnr25.chapt03.01
August 14, 2000
Preliminary
Note
1
1
1
1
1
1
1
1
1
1
1
1
1
1