05_Altera_CPLD的资源优化

Optimizing macrocell utilization and/or
Optimizing routing resource utilization.

To resolve the macrocell usage issues and routing issues.
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 4
Macrocell Architecture

LAB Local Logic Array (Five Programmable Product Terms) Product-Term Select Matrix Programmable Register
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 7
INPUT VCC INPUT VCC
inst4
XOR
a5
b5
INPUT VCC INPUT VCC
inst5
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 15

The sharable expander and the macrocell where it is sourced can be used simultaneously.
Sharable Expander
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 13
MAX Device Architecture


Logic Array Blocks(LABs) & Macrocells Programmable Interconnect Array(PIA) I/O Control Blocks Dedicated Global Inputs
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 6
Agenda



Objectives MAX Device Architecture Resource Optimization Techniques Conclusion Appendix
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 5
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 10
Parallel Expanders Borrowing Rule
Sharable Expanders Usage Example

Assume there are only three product terms in each macrocell. Consider the function
OUT = A’*C*D+B’*C*D+A*B+B*C’
= (A’+B’)*C*D+(A+C’)*B
Implemented in MAX Macrocell
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 8
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 11
Sharable Expanders
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 3
Objectives

To take full advantage of the architectures of the MAX3000 and MAX7000 devices by
Product-Term Line Usage Example
AND2
A
INPUT VCC NOT INPUT VCC
A * B'
inst
OR2
B
A * B' + A * C
OUTPUT
inst2
AND2
OUT
inst3
C
INPUT VCC
inst1
A *C
OUT = A * B’ + A * C
16 Product terms feeding back into the logic array from the 16 macrocells in an LAB, one from each macrocell. Sharable expanders be shared by any or all macrocells in an LAB. The macrocell providing a sharable expander can still implement other logic.
© 2009 Altera Corporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 2
Agenda



Objectives MAX Device Architecture Resource Optimization Techniques Conclusion Appendix



Two groups of 8 macrocells within each LAB (macrocells 1 through 8 and 9 through 16) form two chains to lend or borrow parallel expanders. A macrocell borrows parallel expanders from lowernumbered macrocells. Within each group of 8, the lowest-numbered macrocell can only lend parallel expanders and the highestnumbered macrocell can only borrow them.
Expander Product Terms



Additional Product Terms provided by the other macrocells in the same LAB. Used to implement more complex logic functions. Include
Parallel Expanders
SharCorporation Altera, Stratix, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation 9
Parallel Expanders
Product terms borrowed from the neighboring macrocells. Up to 15 parallel expanders can be borrowed from three neighboring macrocells. The macrocell with parallel expanders lent cannot implement other logic.
Resource Optimization Techniques for Macrocell-Based CPLDs
© 2009 Altera Corporation
Agenda



Objectives MAX Device Architecture Resource Optimization Techniques Conclusion Appendix