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參數(shù)資料
| 型號： | KS8993F |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 27/99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） |
| 配用： | KS8993F-EVAL-ND - EVAL KIT EXPERIMENTAL KS8993F |
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KS8993F
Micrel
August 26, 2004
Revision 1.0
- 33 -
The KS8993F will not forward the following packets:
1. Error packets. These include framing errors, FCS errors, alignment errors, and illegal size packet errors.
2. 802.3x pause frames. The KS8993F will intercept these packets and perform the appropriate actions.
3. “Local" packets. Based on Destination Address (DA) look up, if the destination port from the look up table
matches the port where the packet was from, the packet is defined as "local".
2.4.6
Switching Engine
The KS8993F features a high-performance switching engine to move data to and from the MAC using built-in frame
buffers. It operates in store and forward mode, while the efficient switching mechanism reduces overall latency.
The KS8993F has a 32KB internal frame buffer. This resource is shared between all three ports. The buffer sharing
mode can be programmed through Global Register 2 (0x02). In one mode, ports are allowed to use any free buffers in
the buffer pool. In the second mode, each port is only allowed to use 1/3 of the total buffer pool. There are a total of
250 buffers available. Each buffer is 128 bytes in size.
2.4.7
MAC operation
The KS8993F strictly abides by IEEE 802.3 standards to maximize compatibility.
Inter Packet Gap (IPG)
If a frame is successfully transmitted, the 96-bit time IPG is measured between the two consecutive MTXEN. If the
current packet is experiencing collision, the 96-bit time IPG is measured from MCRS and the next MTXEN.
2.4.8
Back-off Algorithm
The KS8993F implements the IEEE Standard 802.3 binary exponential back-off algorithm, and optional "aggressive
mode" back-off. After 16 collisions, the packet will be optionally dropped depending on the chip configuration in Global
Register 3 (0x03).
2.4.9
Late Collision
If a transmit packet experiences collisions after 512 bit times of the transmission, the packet will be dropped.
2.4.10 Illegal Frames
The KS8993F discards frames less than 64 bytes long and can be programmed to accept frames up to 1536 bytes long
in Global Register 4 (0x04). For special applications, the KS8993F can also be programmed to accept frames up to
1916 bytes long in the same global register. Since the KS8993F supports VLAN tags, the maximum sizing is adjusted
when these tags are present.
2.4.11 Flow Control
The KS8993F supports standard 802.3x flow control frames on both transmit and receive sides.
On the receive side, if the KS8993F receives a pause control frame, the KS8993F will not transmit the next normal
frame until the timer, specified in the pause control frame, expires. If another pause frame is received before the
current timer expires, the timer will be updated with the new value from the second pause frame. During this period
(being flow controlled), only flow control packets from the KS8993F will be transmitted.
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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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