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參數(shù)資料
| 型號： | DM9081F |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 10BASE-T Hub Controller |
| 中文描述： | 10Base - T集線器控制器 |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 188K |
| 代理商： | DM9081F |
DM9081
8
Final
Version: DM9081-DS-F01
April 22, 1997
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# =
EXPIN2# =
EXPIN3# =
EXPOUT2# &
EXPOUT1# &
EXPOUT1# &
EXPOUT3# &
EXPOUT3# &
EXPOUT2# &
….. EXPOUTn#
….. EXPOUTn#
….. 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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相關(guān)代理商/技術(shù)參數(shù) |
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| DM9081FP | 制造商:DAVICOM 制造商全稱:DAVICOM 功能描述:10BASE-T Hub Controller |
| DM9093 WAF | 制造商:Texas Instruments 功能描述: |
| DM9093J/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:J-K-Type Flip-Flop |
| DM9093N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:J-K-Type Flip-Flop |
| DM9093N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:J-K-Type Flip-Flop |
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