DM9081FP DAVICOM [Davicom Semiconductor, Inc.], DM9081FP Datasheet - Page 10

• Manufacturer Part Number: DM9081FP
• Description: 10BASE-T Hub Controller
• Manufacturer: DAVICOM [Davicom Semiconductor, Inc.]

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.
10
TCK
LI_RXn
LED_LATCH
B1
B0
B7
B6
Figure 4. Normal Mode Implementation
Figure 3. Serial LED Signal Timing
B5
B4
B3
B2
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.
B1
B0
B7
B6
10BASE-T Hub Controller
B5
B4
Version: DM9081-DS-F02
DM9081
B3
February 02, 2001
B2
B1
Final