IDT88K8483 Integrated Device Technology, IDT88K8483 Datasheet - Page 125

• Manufacturer Part Number: IDT88K8483
• Description: Spi-4 Exchange Document Issue 1.0
• Manufacturer: Integrated Device Technology

PFP Flow Control Register
PFP Test Register
CREDIT_EN
BURST_EN
REPEAT
SINGLE_REP
LID_REPEAT
STOP
SINGLE _STOP
LID_STOP
IDT IDT88K8483
Field
Field
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read /
Read /
Write
Write
Table 104 PFP Flow Control Register (Block Base=0x1700/0x1F00, Register Offset=0x03)
Table 105 PFP Test Register
0:0
0:1
0:1
1:0
1:1
0:0
0:2-0:7
1:2-1:7
Bits
Bits
1
1
1
1
6
1
1
6
Length
Length
0
0
0
0
0
0
0
0
(Block Base=
Reset
Reset
State
State
125 of 162
This field enables the information received over the FIFO status channel to be
interpreted as credit rather than status.
0:Status mode. In status mode the SPI-4 egress state used to schedule each LID
remains the same until the received calendar status credit entry for the LID changes
value. If the status is hungry or starving, transfers will continue until the status
changes to satisfied even if fewer credits have been received than egress transfers.
1:Credit enable. In this mode, the SPI-4 egress will issue one credit’s worth data
burst for the LID and then wait for another credit from the status channel before
issuing another credit burst for that LID.
This field enables bursts consisting of multiple transfers for the same LID to be
made to the egress port buffers. This burst mode modifies the round-robin egress
scheduler to prioritize those LIDs having multiple packet fragments or complete
packets waiting for transfer.
0: Burst not enabled. The SPI-4 egress can transfer only one fragment of data for
the scheduled LID to the egress port buffer.
1: Burst enabled.The SPI-4 egress can transfer more than one data segment to the
egress port buffer.
0: Entries in the queue, corresponding to packets or packet fragments stored in the
data buffer are deleted once they are processed by the egress server.
1: Entries in the queue are not deleted after they processed by the egress server.
0: Indicates that all 64 LIDs will be repeated.
1: Indicates that only a single LID in field LID_REPEAT will be repeated.
0: Indicates the repeat operation is valid for all 64 LIDs.
LID number: Indicates the repeat operation is valid for a single LID.
0: Normal operation.
1: Disables the service operation by stopping the egress server.
0: Stops service operation of all LIDs.
1: Stops service operation of a single LID indicated by LID_STOP.
0: Indicates the stop operation is valid for all 64 LIDs.
LID number: Indicates the stop operation is valid for a single LID.
0x1700/0x1F00
, Register Offset=0x04)
Description
Description
October 20, 2006