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參數(shù)資料
| 型號： | KSZ8993F |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 36/100頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV MED 10/100 3PORT 128PQFP |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 系列： | * |
| 類型： | * |
| 應(yīng)用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 128-BFQFP |
| 供應(yīng)商設(shè)備封裝： | 128-PQFP（14x20） |
| 包裝： | 散裝 |
| 產(chǎn)品目錄頁面： | 1081 (CN2011-ZH PDF) |
| 其它名稱： | 576-1033 |
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Micrel, Inc.
KS8993F/FL
June 2009
40
M9999-062509
hbwhelp@micrel.com or (408) 955-1690
For split transmit queues, the KS8993F provides four priority schemes:
1.
“Transmit all high priority packets before low priority packets”, i.e. a low priority packet could be transmitted
only when the high priority queue is empty;
2.
“Transmit high priority packets and low priority packets at 10:1 ratio”, i.e. transmit a low priority packet after
every 10 high priority packets are transmitted, if both queues are busy;
3.
“Transmit high priority packets and low priority packets at 5:1 ratio”;
4.
“Transmit high priority packets and low priority packets at 2:1 ratio”.
If a port's transmit queue is not split, both high priority packets and low priority packets have equal priority in the
transmit queue. Register 5 bits [3:2] are used to select the desired priority scheme. Optionally, the PRSEL1 and
PRSEL0 strap-in pins can be used.
Port based priority
With port based priority, each ingress port can be individually classified as a high priority receiving port. All packets
received at the high priority receiving port are marked as high priority, and will be sent to the high priority transmit
queue if the corresponding transmit queue is split. Bit 4 of registers 16, 32 and 48 is used to enable port based priority
for ports 1, 2 and 3, respectively. Optionally, the Px_PP strap-in pins can be used to enable this feature.
802.1p based priority
For 802.1p based priority, the KS8993F will examine the ingress (incoming) packets to determine whether they are
tagged. If tagged, the 3-bits priority field in the VLAN tag is retrieved and compared against the “priority base” value,
specified by register 2 bits [6:4]. The “priority base” value is programmable; its default value is 0x4.
The following figure illustrates how the 802.1p priority field is embedded in the 802.1Q VLAN tag.
Figure 6: 802.1p Priority Field Format
Preamble
DA
TCI
86
6
2
length
LLC
Data
FCS
2
46-1500
4
1
Tagged Packet Type
(8100 for Ethernet)
802.1p
CFI
VLAN ID
Bytes
Bits
16
3
12
802.1q VLAN Tag
2
SA
VPID
If an ingress packet has an equal or higher priority value than the "priority base" value, the packet will be placed in the
high priority transmit queue if the corresponding transmit queue is split. 802.1p based priority is enabled by bit 5 of
registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the Px_1PEN strap-in pins can be used to enable
this feature.
The KS8993F provides the option to insert or remove the priority tagged frame's header at each individual egress port.
This header, consisting of the 2 bytes VLAN Protocol ID (VPID) and the 2 bytes Tag Control Information field (TCI), is
also refer to as the 802.1Q VLAN Tag.
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相關(guān)代理商/技術(shù)參數(shù) |
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| KSZ8993F-A1 | 功能描述:IC CONV MED 10/100 3PORT 128PQFP RoHS:是 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
| KSZ8993F-EVAL | 功能描述:BOARD EVALUATION FOR KSZ8993F RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035 |
| KSZ8993FL | 功能描述:以太網(wǎng) IC 2+1 Port 10/100 Switch w/Transceivers & TS-1000 OAM, single 3.3V supply, 128-PQFP, Lead free RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8993FL-EVAL | 功能描述:BOARD EVALUATION FOR KSZ8993FL RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035 |
| KSZ8993I | 功能描述:以太網(wǎng) IC 3 Port 10/100 Switch w/Tranceivers & Frame Buffers, 128-PQFP, I-TEMP RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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