ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 412

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

IBM3206K0424
IBM Processor for Network Resources
The PHY Interface (LINKC)
Page 412 of 676
Bit(s)
7-0
6-5
8
7
6
5
4
3
2
1
0
Reserved
Bits 7-0 only have meaning if a PMC PM5346 SUNI LITE/UTOPIA (bits 15-13 = "011") is selected. Otherwise, these bits
will be ignored. Bits 2-0 are used to make adjustments to the Utopia interface for compatibility with the Suni-PHD PHY.
52 Byte Cell
Reserved
Unassigned/Idle Cell Reception
Disable Limited HEC Checking on
Received Idle/Unassigned Cells
Ignore GFC in Null/Idle Cell Deter-
mination
Enable XON/XOFF
Drive RENB Inactive When Not
Receiving
Gate RSOC with RCA
Receive Extra Header Byte
Name
Reserved
When set, the cell received from the PHY is 52 bytes. No HEC byte will be received.
Reserved
When set to ’1’, this bit will enable unassigned/idle cell reception. This should be set to
’0’ when using the internal SONET Framer.
If bit 5 is set to ’1’, the receive logic will ignore the HEC byte of the header of idle and
unassigned cells. Idle is defined as a header of X'00000001' and unassigned is defined
as a header of X'0000000n' where n is 'xxx0'.
If bit 6 is set to enable unassigned/idle cell reception, all cells are passed to REASM
regardless of how this bit is set. If bit 6 is set to disable unassigned/idle cell reception
and this bit is set to ’0’, the HEC byte of cells with an apparent idle header will be com-
pletely checked before deciding whether or not to pass the cell to REASM. If a cell
appears to have an unassigned header, HEC bits seven, six, and zero will be checked
because they are a constant regardless of the value of bits 3-1 of the header. If other
HEC bits are bad, REASM will detect the HEC error and discard the cell. If there is a
correctable HEC error and the cell is indeed unassigned, an out of range error will
occur in REASM.
Bit 4, when set, will cause the receive logic to ignore the first four bits of the ATM
header in determining whether a cell being received is a null or idle cell.
Bit 3, when set, will allow the XON/XOFF bit of the header of a received cell to sus-
pend/continue transmission from the IBM3206K0424's transmit logic for all ports asso-
ciated with Config 1.
When set to ’1’, this bit forces the receive logic to deactivate RENB when in the idle
state.
When set to ’1’, this bit forces the receive logic to see both RSOC and RCA before
considering RSOC valid.
When set to ’1’, this bit allows an extra header byte to be accepted at the start of a cell
by the receive logic. The extra byte is discarded.
Description
pnr25.chapt05.01
August 14, 2000
Preliminary