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DM9081 Datasheet(PDF) 8 Page - Davicom Semiconductor, Inc. |
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DM9081 Datasheet(HTML) 8 Page - Davicom Semiconductor, Inc. |
8 / 22 page 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 |
Similar Part No. - DM9081_01 |
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Similar Description - DM9081_01 |
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