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| 型號(hào)： | KSZ8862-16MQL |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 52/125頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 16BIT 128-PQFP |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 系列： | KSZ8862 |
| 控制器類型： | 以太網(wǎng)開(kāi)關(guān)控制器 |
| 接口： | PCI |
| 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： | 托盤(pán) |
| 配用： | 576-1638-ND - BOARD EVALUATION KSZ8862-10FL 576-1637-ND - BOARD EVALUATION KSZ8862-100FX |
| 其它名稱： | 576-1564 |
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Micrel, Inc.
KSZ8862-16/32MQL
April 2007
32
M9999-040407-3.0
Switching Engine
The KSZ8862M features a high-performance switching engine to move data to and from the MAC’s packet buffers. It
operates in store and forward mode, while the efficient switching mechanism reduces overall latency.
The switching engine has a 32KB internal frame buffer. This resource is shared between all the ports. There are a total of
256 buffers available. Each buffer is sized at 128B.
MAC Operation
The KSZ8862M strictly abides by IEEE 802.3 standards to maximize compatibility. Additionally, there is an added MAC
filtering function to filter Unicast packets. The MAC filtering function is useful in applications such as VoIP where
restricting certain packets reduces congestion and thus improves performance.
Inter Packet Gap (IPG)
If a frame is successfully transmitted, the minimum 96-bit time for IPG is measured between two consecutive packets. If
the current packet is experiencing collisions, then the minimum 96-bit time for IPG is measured from carrier sense (CRS)
to the next transmit packet.
Back-Off Algorithm
The KSZ8862M implements the IEEE standard 802.3 binary exponential back-off algorithm in half-duplex mode, and
optional "aggressive mode" back-off. After 16 collisions, the packet is optionally dropped depending upon the switch
configuration in SGCR1 [8].
Late Collision
If a transmit packet experiences collisions after 512 bit times of the transmission, then the packet is dropped.
Legal Packet Size
The KSZ8862M discards packets less than 64 bytes and can be programmed to accept packet size up to 1536 bytes in
SGCR2 [1]. The KSZ8862M can also be programmed for special applications to accept packet size up to 1916 bytes in
SGCR2 [2].
Flow Control
The KSZ8862M supports standard 802.3x flow control frames on both transmit and receive sides.
On the receive side, if the KSZ8862M receives a pause control frame, the KSZ8862M 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 in the second pause frame. During this period (while it is flow
controlled), only flow control packets from the KSZ8862M are transmitted.
On the transmit side, the KSZ8862M has intelligent and efficient ways to determine when to invoke flow control. The flow
control is based on availability of the system resources, including available buffers, available transmit queues, and
available receive queues.
The KSZ8862M will flow control a port that has just received a packet if the destination port resource is busy. The
KSZ8862M issues a flow control frame (Xoff), containing the maximum pause time as defined in IEEE standard 802.3x.
Once the resource is freed up, the KSZ8862M then sends out the other flow control frame (Xon) with zero pause time to
turn off the flow control (turn on transmission to the port). A hysteresis feature is provided to prevent the flow control
mechanism from being constantly activated and deactivated.
The KSZ8862M flow controls all ports if the receive queue becomes full.
Half-Duplex Backpressure
A half-duplex backpressure option (not in IEEE 802.3 standards) is also provided. The activation and deactivation
conditions are the same in full-duplex mode. If backpressure is required, then the KSZ8862M sends preambles to defer
the other stations' transmission (carrier sense deference).
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| KSZ8862-16MQL-FX | 功能描述:以太網(wǎng) IC 2-Port Ethernet Switch/Repeater + Generic (16-bit) bus interface. Fiber Capabilities on Port-1(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 |
| KSZ8862-32MQL | 功能描述:以太網(wǎng) IC 2-Port Ethernet Switch/Repeater + Generic (32-bit) bus interface. Fiber Capabilities on Port-1(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 |
| KSZ8862-32MQL-FX | 功能描述:以太網(wǎng) IC 2-Port Ethernet Switch/Repeater + Generic (32-bit) bus interface. Fiber Capabilities on Port-1(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 |
| KSZ8862-MQL | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2-Port Ethernet Switch with Non-PCI Interface and Fiber Support |
| KSZ8863FLL | 功能描述:以太網(wǎng) IC 3-Port 10/100 Ethernet Switch with 1x FX Port and 1x TX Port (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 |
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