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What Are the Major Considerations When Migrating from the NAT4882 Chip to the TNT4882?

Hardware: GPIB

Problem:
What are the major considerations when migrating from the NAT4882 chip to the TNT4882?

Solution:
The first major issue is to determine which TNT chip you will need. If the current application uses the NAT4882 as a GPIB Talker/Listener (but not as a GPIB controller), then the TNT4882-AQ Talker/Listener chip is excellent choice.

Note: If you have register-level programming questions regarding the TNT4882C Controller Chip, please contact your local NI sales representative. Because the TNT4882C is a proprietary chip, you must sign non-disclosure/non-competitive agreements before we can supply you with the necessary manuals.

Have the pin connections from the NATstayed the same, with the TNT simply adding extra pins for added functionality?

No. The CPU interface is similar, but different. One needs to read the hardware considerations chapter of the TNT4882 Programmer's Reference Manual (320724-01). One should also read the application note about Porting a NAT7210 design to the TNT4882. The issues are similar.

What are the major software issues?

• One cannot easily port code that used the DMA features of the NAT4882.
  
• If one is using interrupts, set the TLCINT bit in IMR3 on the TNT4882 to enable the TNT4882's interrupt pin.
  
• Registers will appear at different offsets (depending on the HW design).

Related Links:
Product Manuals: IEEE 488.2 Controller
Product Manuals: Single-Chip IEEE 488.2(TNT) Talker/Listener ASIC

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Report Date: 10/09/1997
Last Updated: 04/16/2008
Document ID: 1289ET52

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