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PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
159
Register 0x84: TXCP Idle Cell Header Control
Bit Type Function Default
Bit 7 R/W GFC[3] 0
Bit 6 R/W GFC[2] 0
Bit 5 R/W GFC[1] 0
Bit 4 R/W GFC[0] 0
Bit 3 R/W PTI[2] 0
Bit 2 R/W PTI[1] 0
Bit 1 R/W PTI[0] 0
Bit 0 R/W CLP 1
CLP:
The CLP bit contains the eighth bit position of the fourth octet of the
idle/unassigned cell pattern. Cell rate decoupling is accomplished by
transmitting idle cells when the TXCP detects that no outstanding cells exist in
the transmit FIFO.
PTI[3:0]:
The PTI[3:0] bits contains the fifth, sixth, and seventh bit positions of the
fourth octet of the idle/unassigned cell pattern. Idle cells are transmitted when
the TXCP detects that no outstanding cells exist in the transmit FIFO.
GFC[3:0]:
The GFC[3:0] bits contain the first, second, third, and fourth bit positions of
the first octet of the idle/unassigned cell pattern. Idle/unassigned cells are
transmitted when the TXCP detects that no outstanding cells exist in the
transmit FIFO. The all zeros pattern is transmitted in the VCI and VPI fields of
the idle cell.