參數(shù)資料
型號(hào)： MDS212CG
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 網(wǎng)絡(luò)接口
英文描述： 12-Port 10/100Mbps Ethernet Switch
中文描述： DATACOM, LAN SWITCHING CIRCUIT, PBGA456
封裝： 35 X 35 MM, 2.33 MM HEIGHT, MS-034, HSBGA-456
文件頁(yè)數(shù)： 45/111頁(yè)
文件大?。?/td> 1609K
代理商： MDS212CG
MDS212
Data Sheet
45
Zarlink Semiconductor Inc.
The port status of the MDS212 is transmitted to an external decoder via a serial output channel. In the MDS212, we
support cascading of this serial output channel between two devices. One MDS212 is configured as the master, this
initiates the start of LED information frames, and serializes information bits. The MDS212 slave repeats the
information sent from the master and appends its own information bits. To cascade these two devices, we will need
to extend the number of LED pins from 3 to 5. Figure 15 shows 2 LED interfaces are cascaded and the connections
between the MDS212s, LED decoder and LED display.
11.1.1 Function Description
The LED interface employs the following signals:
Table 8 - LED Signal Names and Descriptions
11.1.2 Port Status
In the MDS212, each port consists of 8 different LED status, represented by separate bits:
1. Flow Control
2. Transmitting Data
3. Receiving Data
4. Action (TxD or RxD)
5. Link UP/DOWN
6. Speed
7. Full Duplex/Half Duplex
8. Collision.
In addition to the 12 ports of the MDS212, three extra user-defined status sets may be sent through the LED serial
channel for debugging or other applications, where each user-defined status set is also represented by 8 bits.
11.1.3 LED Interface Time Diagram
The Master needs to shift out (16)*8 status bits periodically((12 port status +4 reserved)*8). Thus, slave needs to
shift out (16)*8 + (16)*8 status bits, which includes the status of the master device and itself.
The status of each port will be sampled by the LED State Machine every 20.5
μ
s, the time period of the frame. That
is, each LED data frame length equals (256)X 80nsec. Each frame is divided into two sub- frames: a master and a
slave sub-frame. Furthermore, each sub-frame is partitioned into 16 slots (12 MAC ports and 4 reserved slots) and
each slot will carry 8 status bits. Figure 16 shows the signal from the slave chip to LED decoder.
Signal Name
Description
Master Device
Slave Device
LE_CLKO
LED Clock-Synchronous LED clock provided by the slave device to LED
decoder at the system clock divided by 8(~12.5Mhz).
LE_SYNI
LE_SYNO
A synchronous pulse--defines the boundary between frames. The length of
each LED data frame is about 256-bits that shift out by LED_CLK per bit.
LE_DI
LE_DO
A continuous serial stream of data for all status LEDs which repeat once
every frame time.
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