HC4GX15 Datasheet, PDF (30/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–4
Chapter 2: Logic Array Block and Adaptive Logic Module Implementation in HardCopy IV Devices
MLAB Function Implementation
MLAB Function Implementation
In Stratix IV devices, the MLAB is a LAB derivative that you can configure to support
up to a maximum of 640 bits of simple dual-port static random access memory
(SRAM). Similar to the LAB, each MLAB consists of ten ALMs and can implement all
the functionality of the LAB in addition to the memory function. In HardCopy IV
devices, the MLAB functions are mapped to HCell macros that provide the same
memory functionality.
f For more information about memory implementation using MLABs, refer to the
TriMatrix Embedded Memory Blocks in Stratix IV Devices chapter in volume 1 of the
Stratix IV Device Handbook.
f For more information about HardCopy IV memory support, refer to the TriMatrix
Embedded Memory Blocks in HardCopy IV Devices chapter in volume 1 of the
HardCopy IV Device Handbook.
Conclusion
In HardCopy IV devices, the basic building block of the core array is the HCell.
HCells are connected together to form HCell macros that can implement all the
functionality of the ALMs, LABs, and MLABs in the Stratix IV devices. Only HCells
required to implement the design are used, while unused HCells are powered down.
This allows the core fabric to be efficiently used and offers significant static power
savings compared to the Stratix IV FPGA prototype devices.
Referenced Documents
This chapter references the following documents:
■ DSP Block Implementation in HardCopy IV Devices chapter in volume 1 of the
HardCopy IV Device Handbook
■ Logic Array Blocks and Adaptive Logic Modules in Stratix IV Devices chapter in
volume 1 of the Stratix IV Device Handbook
■ TriMatrix Embedded Memory Blocks in HardCopy IV Devices chapter in volume 1 of
the HardCopy IV Device Handbook
■ TriMatrix Embedded Memory Blocks in Stratix IV Devices chapter in volume 1 of the
Stratix IV Device Handbook
Document Revision History
Table 2–1 shows the revision history for this chapter.
Table 2–1. Document Revision History
Date
December 2008
Version
1.0 Initial release.
Changes Made
HardCopy IV Device Handbook, Volume 1
© December 2008 Altera Corporation