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Is it possible to replace sn74ACT8990 with CPLD?

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lslrf

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sn74act8990

Is it possible to replace sn74ACT8990 with CPLD?
xds510pp emulator, the cpld can replace the smc34c60.the sn74act8990 is very very valuable.
 

thoroide

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sn74act8990 cpld

This device is for protection purpose.
Each time you connect the emulator to a board, is better you safe too much the emulator because the board (tipically a prototype) can have trouble, and damage the emulator.

So in case of damage, is better you damage a line driver instead of CPLD.

Removing line driver reduce a few the size of emulator, but unprotect it from external faults.

I think is not usefull unuse the line driver.

Bye
 

bobcat1

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std8990 vhdl

Hi

The 74ACT8990 is a test bus controller(e.g JTAG signal processor) not a line driver

Yes you can emulate the 74act8990 with a CPLD but this way it will cost lot more

then ordering one from digikey {for instance}

All the best

Bobi
 

eltonjohn

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act8990 cpld

This chip is a TAP ..there is at opencores.org a TAP core that coud be used as a "starting point" but the 74ACT8990 has more functionnality that need to be inluded .. It only makes sense if you want to replace several chips and the 74ACT8990 included .Otherwise Bobcat is right .It's not worthy it can be ordered from digikey .
 

thoroide

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std8990.vhd the model

Yes I do a mistake, I referred to my XDS510PP that have some line driver for protection purpose, bu it is not 74ACT8990, I opened now and inside there are 2 74ABT245 and one 74LVHT244.

Probably there are a new model of this emulator.

Sorry.
 

strayblue

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std8990

I also want to implement act8990 with CPLD or FPGA.Have you do it?


lslrf said:
Is it possible to replace sn74ACT8990 with CPLD?
xds510pp emulator, the cpld can replace the smc34c60.the sn74act8990 is very very valuable.
 

dainis

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74abt245 damage

I do not have any comments ....
 

virgorabbit

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The file std8990.vhd shows there is only 8-bit databus for this component. But, actually, TI's snACT8990 has 16 bit databus. It seems they are not the same.
 

eltonjohn

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the file implements a sn74act8980 not a sn74act8990!
 

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