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| 型号： | IDT88P8344BHGI |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 64/98页 |
| 文件大小： | 0K |
| 描述： | IC SPI3-SPI4 EXCHANGE 820-PBGA |
| 标准包装： | 24 |
| 系列： | * |
| 其它名称： | 88P8344BHGI |
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IDT88P8344 SPI EXCHANGE 4 x SPI-3 TO SPI-4
INDUSTRIALTEMPERATURERANGE
APRIL 10, 2006
TABLE 83 - SPI-4 TO SPI-3 PFP REGISTER (0x00)
Field
Bits
Length
Initial Value
NR_LID
2:0
3
0b011
Reserved
7:3
5
0x00
TABLE 84 - NR_LID FIELD ENCODING
NR_LID
Maximum Number
Maximum Buffer Segments
of LIDs
for a LID
0b000
1
508
0b001
4
256
0b010
8
128
0b011
16
64
0b100
32
0b101
64
16
9.3.14 Block base 0x1900 registers
SPI-4 to SPI-3 PFP register (Block_base 0x1900 +
Register_Offset 0x00)
TheSPI-4ingresstoSPI-3egressPacketFragmentProcessorregisters are
at Block_Base 0x1900 + Register_offset 0x00. A SPI-4 to SPI-3 PFP Register
has read and write access. The bit fields of a SPI-4 to SPI-3 PFP Register are
described.
NR_LID
The maximum number of LIDs per SPI-3 physical inter-
facethatwilleverbeusedisprogrammedintotheNR_LIDfield.Onceconfigured
after reset, this value can not be changed. Fewer LIDs can be used by not
activating some of the LIDs, but more LIDs than the value in NR_LID are not
allowed and will generate an error. The NR_LID field is important, as the buffer
segment pool is divided among the number of LIDs programmed into the
NR_LID field.
A128KbyteSPI-4toSPI-3buffersegmentpoolforstoringpacketfragments
for a SPI-3 egress is available per SPI-3 physical port. A configurable part of
the buffer segment pool can be assigned to each of the LIDs, as determined by
the NR_LID value, per SPI-3 physical interface. The buffer size (M) for a LID
can be configured in multiples of 256 bytes. Modifications of the buffer size
allocatedtoaLIDaresupportedonlywhenthelogicalportassociatedtotheLID
is disabled. Attempts to allocate more memory than available will generate an
allocation error event. The indirect access module will discard the attempt.
The 128 Kbyte SPI-4 to SPI-3 buffer segment pool is divided into 508 buffer
segments.Eachbuffersegmentisequalto256bytes.Thebuffersegmentsare
shared among the number of logical ports defined by the static NR_LID
configuration. The buffer segments do not have to be equally shared among
theallocatedLIDs.Onebuffersegmentcorrespondstoapacketfragmenttobe
forwarded to a SPI-3 egress physical interface.
Anexampleoftheuseofthebuffersegmentpoolfollows.ForaSPI-3egress
interface that will never have more than eight LIDs, set the NR_LID field for this
interfaceto0x02.Thisallows128buffersegmentsforaLIDwiththetotalnumber
of buffer segments for all eight LIDs equal to 508.
Let’s say you want only 24 (base 10) buffer segments for one of the LIDs.
Program field M for that LID to 0x018 (24 base 10). Let’s say you want to set
the per-LID starving backpressure for the SPI-4 ingress interface when 20 of
the 24 allocated buffers for this LID are full. In other words, you want to assert
SPI-4 ingress starving when only 4 segments remain for this LID. Since
M=0x018, N=1 from the description of the M field above [Block_base 0x1800].
Setting the FREE_SEGMENT_S field to 4 then yields the desired
THRESHOLD_S of 4. Similarly, to set the per-LID SPI-4 ingress hungry
threshold,THRESHOLD_H,totripwhenonly6buffersegmentsremainforthis
LID, program the FREE_SEGMENT_H field for this LID to 6.
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相关代理商/技术参数 |
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| IDT88P8344BHI | 功能描述:IC SPI3-SPI4 EXCHANGE 820-PBGA RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA（27x27） 包装:散装 |
| IDT89H10T4BG2ZBBC | 制造商:Integrated Device Technology Inc 功能描述:IC PCI SW 10LANE 4PORT 324BGA |
| IDT89H10T4BG2ZBBC8 | 制造商:Integrated Device Technology Inc 功能描述:IC PCI SW 10LANE 4PORT 324BGA |
| IDT89H10T4BG2ZBBCG | 功能描述:IC PCI SW 10LANE 4PORT 324BGA RoHS:是 类别:集成电路 (IC) >> 专用 IC 系列:PRECISE™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA（27x27） 包装:散装 |
| IDT89H10T4BG2ZBBCG8 | 制造商:Integrated Device Technology Inc 功能描述:IC PCI SW 10LANE 4PORT 324BGA |
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