DM9081 데이터 시트보기 (PDF) - Davicom Semiconductor, Inc.

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DM9081

10 BASE-T hub controller

Davicom Semiconductor, Inc. 

DM9081

10BASE-T Hub Controller

Normal Mode

In normal mode, TESTPIN0 and TESTPIN1 must be

pulled high. The COL_LED, AUI1_CRS_LED and

AUI2_CRS_LED pins are defined as minimum mode,

whereas the other LED drive pins require external

devices to display the status from the LED pins.

These pins transmit information from the DM9081 by

first sending Bit 7. A detailed timing diagram is given

in Figure 3. The shift logic and latch device shown in

Figure 4 is used to convert received serial data into

byte- oriented data. The output data is used to drive

the LED.

LED Latch

The LED_LATCH pin is used to latch the

byte-oriented data. The rising edge of the TCK clock,

occurring on the high state LED_LATCH, is used to

strobe in the state of the following LED pins.

TCK

LI_RXn

B1 B0

LED_LATCH

B7 B6 B5 B4 B3 B2 B1 B0

B7 B6 B5 B4 B3 B2 B1

Figure 3. Serial LED Signal Timing

Figure 4. Normal Mode Implementation

10

Final

Version: DM9081-DS-F02

February 02, 2001

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