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AR# 34395 Spartan-6 Packaging - Why does the Spartan-6 LX45 have more pins than the LX75 in the FG(G)484 package?

Description


In the Spartan-6 Family Overview Data Sheet (DS160), Table 2 shows the device package combinations:
http://www.xilinx.com/support/documentation/data_sheets/ds160.pdf
The Spartan-6 LX75 device (XC6SLX75) shows less available I/Os in the FG(G)484 package than the Spartan-6 LX45 device (XC6SLX45) in that same package. Why is this?

Solution

The Device-Package Combination table is correct. The cause of the fewer available I/Os is that the LX75T adds another pair of GTP_DUAL at the bottom of the device. The LX45T has two GTP_DUAL, and the LX75T has four.Those additional two GTP_DUALs take away available I/O.The Spartan-6 devices use derived die technology; see (Xilinx Answer 34394), so the added GTP_DUALs have an impact on the LX devices, even though they do not use the GTPs.

Linked Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
34394 Spartan-6 Packaging - Do the LX and LXT share a common die? N/A N/A

Actions

AR# 34395
Date Created 09/10/2010
Last Updated 02/20/2013
Status Active
Type General Article
Devices
  • Spartan-6 LX
  • Spartan-6 LXT
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