參數(shù)資料
型號: IDT88K8483BRI
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 28/162頁
文件大小: 0K
描述: IC SPI-4 EXCHANGE 3PORT 672-BGA
標(biāo)準(zhǔn)包裝: 24
系列: *
其它名稱: 88K8483BRI
123 of 162
October 20, 2006
IDT IDT88K8483
PFP Egress Packet Mode Control Registers
There are 64 registers, one for each LID.
PFP Link Number Configuration Register
PFP Buffer Management Configuration Register
Field
Read /
Write
Bits
Length Reset
State
Description
PKT_MODE
R/W
0:0
1
0
This field is used to program the PFP egress to interleaved mode or packet mode.
0: Interleaved mode. The LID is eligible to be served by the egress scheduler if
there is one or more packet fragment in the queue.The transfer unit is one packet
fragment.
1: Packet mode. The LID is eligible to be served by the egress scheduler if there are
one or more packets in the data memory.The transfer unit is one packet.
EBP_EN
R/W
0:1
1
0
This control bit enables early backpressure propagation.
0: Normal backpressure.
1:Enable early backpressure propagation.
Table 100 PFP Egress Packet Mode Control Register (Block Base=0x1600/0x1E00, Register Offset=0x00-0x3F)
Field
Read /
Write
Bits
Length Reset
State
Description
NR_LID
R/W
0:0-0:2
3
0
Link Identifier (LID) number configuration. Configures the maximum number of LIDs
that the application will use for this PFP data buffer. Once configured this value
should not be changed without resetting the IDT88K8483.
NR_LID Maximum number of LIDs
000
1
001
4
010
8
011
16
100
32
101
64
Table 101 PFP Link Number Configuration Register
(Block Base=0x1700/0x1F00, Register Offset=0x00)
Field
Read /
Write
Bits
Length Reset
State
Description
BUF_THR
R/W
0:0-1:0
9
0x1c0
Indicates the global threshold for segmented data buffer at which the backpressure
is initiated. This field must be configured before the overbooking mode is enabled
(OVBK_EN = 1). Unit is the number of LIDs.
OVBK_EN
R/W
1:1
1
0
This indicates the manner in which the 508 data buffer segments in the PFP are
managed.
0: Non-overbooking mode.This means that the number of data buffer segments allo-
cated to each LID is limited by the M field in PFP Buffer Segment Assign Table
1:Enable overbooking mode. This means that data buffer segments can now be
shared between LIDs up to 8 times the value of M if free segments are available.
Table 102 PFP Buffer Management Configuration Register (Block Base=0x1700/0x1F00, Register Offset=0x01)
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