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DM9081 Datasheet(PDF) 8 Page - Davicom Semiconductor, Inc.

No. de pieza DM9081
Descripción Electrónicos  10BASE-T Hub Controller
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Fabricante Electrónico  DAVICOM [Davicom Semiconductor, Inc.]
Página de inicio  http://www.davicom.com.tw
Logo DAVICOM - Davicom Semiconductor, Inc.

DM9081 Datasheet(HTML) 8 Page - Davicom Semiconductor, Inc.

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DM9081
10BASE-T Hub Controller
8
Final
Version: DM9081-DS-F02
February 02, 2001
External Logic
A simple logic scheme is required when more than
two DM9081 chips are connected to increase the
total number of repeater ports. The external logic
should have one input (EXPOUT#) and one output
(EXPIN#) for each DM9081 chip. This function is
easily implemented in a PAL device, using the
following logical equations:
EXPIN1# =
EXPOUT2# & EXPOUT3# &
….. EXPOUTn#
EXPIN2# =
EXPOUT1# & EXPOUT3# &
….. EXPOUTn#
EXPIN3# =
EXPOUT1# & EXPOUT2# &
….. EXPOUTn#
.
.
.
.
.
.
.
.
.
.
.
.
EXPINn# =
EXPOUT1# & EXPOUT2# &
….. EXPOUTN-1#
The above equations are in positive logic, i.e., a
variable is true when asserted. An example of three
banked DM9081 chips is shown in Figure 1. The
cascade IC number recommended: under 3 and
inclusive.
Note that if the design includes only two DM9081
chips, then EXPOUT1# is connected to EXPIN2#,
EXPOUT2# is connected to EXPIN1#, and no
external logic is required. A single PAL16L8 performs
the arbitration function for a repeater based on
several DM9081 chips.
Figure 1. Multiple DM9081 Devices


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