參數(shù)資料
型號(hào)： KS8993F
廠商： Micrel Inc
文件頁數(shù)： 36/99頁
文件大小： 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）
配用： KS8993F-EVAL-ND - EVAL KIT EXPERIMENTAL KS8993F
KS8993F
Micrel
August 26, 2004
Revision 1.0
- 41 -
the ingress port’s default tag. The default tags are programmed in register sets {19,20}, {35,36} and {51,52} for ports
1, 2 and 3, respectively. The KS8993F will not add tags to already tagged packets.
Tag removal is enabled by bit 1 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively.
Optionally, the
Px_TAGRM strap-in pins can be used to enable this feature. At the egress port, tagged packets will have their 802.1Q
VLAN Tags removed. The KS8993F will not modify untagged packets.
The CRC is recalculated for both tag insertion and tag removal.
802.1p priority field re-mapping is a QoS feature that allows the KS8993F to set the “User Priority Ceiling” at any
ingress port. If the ingress packet’s priority field has a higher priority value than the default tag’s priority field of the
ingress port, the packet’s priority field is replaced with the default tag’s priority field. The “User Priority Ceiling” is
enabled by bit 3 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively.
DiffServ based priority
DiffServ based priority uses registers 96 to 103. More details are provided at the beginning of the Advanced Control
Registers section.
2.9.4
Rate Limit Support
The KS8993F supports hardware rate limiting independently on the “receive side” and on the “transmit side” on a per
port basis. Rate limiting is supported in both priority and non-priority environment. The rate limit starts from 0 kbps
and goes up to the line rate in steps of 32 kbps. The KS8993F uses “one second” as the rate limiting interval. At the
beginning of each interval, the counter is cleared to zero, and the rate limit mechanism starts to count the number of
bytes during the interval.
On the “receive side”, if the number of bytes exceeds the programmed limit, the switch will stop receiving packets on
the port until the “one second” interval expires. Flow control can be enabled to prevent packet loss. If the rate limit is
programmed greater than or equal to 128 kbps and the byte counter is 8 Kbytes below the limit, flow control will be
triggered. If the rate limit is programmed lower than 128 kbps and the byte counter is 2 Kbytes below the limit, flow
control will also be triggered.
On the “transmit side”, if the number of bytes exceeds the programmed limit, the switch will stop transmitting packets
on the port until the “one second” interval expires.
If priority is enabled, the KS8993F can be programmed to support different rate limits for high priority packets and low
priority packets.
2.10 Configuration Interface
The KS8993F can operate as both a managed switch and an unmanaged switch.
In unmanaged mode, the KS8993F is typically programmed using an EEPROM.
If no EEPROM is present, the
KS8993F is configured using its default register settings. Some default register settings can be overridden via strap-in
pin options. The strap-in pins are indicated in the “KS8993F Pin Description and I/O Assignment” table in section 1.2.
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KS8993F-A1 功能描述:IC CONV MED 10/100 3PORT 128PQFP RoHS:否 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
KS8993FA5 功能描述:IC SWITCH 3-PORT 10/100 128-PQFP RoHS:否 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
KS8993F-EVAL 功能描述:EVAL KIT EXPERIMENTAL KS8993F RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
KS8993FL 功能描述:IC CONV MED 10/100 SGL 128PQFP RoHS:否 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
KS8993FL-EVAL 功能描述:BOARD EVAL EXPERIMENT KS8993F RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
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