- published: 19 Jul 2013
- views: 199877
A field-programmable gate array (FPGA) is an integrated circuit designed to be configured by the customer or designer after manufacturing—hence "field-programmable". The FPGA configuration is generally specified using a hardware description language (HDL), similar to that used for an application-specific integrated circuit (ASIC) (circuit diagrams were previously used to specify the configuration, as they were for ASICs, but this is increasingly rare). FPGAs can be used to implement any logical function that an ASIC could perform. The ability to update the functionality after shipping, partial re-configuration of a portion of the design and the low non-recurring engineering costs relative to an ASIC design (notwithstanding the generally higher unit cost), offer advantages for many applications.
FPGAs contain programmable logic components called "logic blocks", and a hierarchy of reconfigurable interconnects that allow the blocks to be "wired together"—somewhat like many (changeable) logic gates that can be inter-wired in (many) different configurations. Logic blocks can be configured to perform complex combinational functions, or merely simple logic gates like AND and XOR. In most FPGAs, the logic blocks also include memory elements, which may be simple flip-flops or more complete blocks of memory.
I watched you sit alone
I watched you cry your eyes out
Now tell me what you've done
Is it so bad that
I would shut you out
And leave you here alone
Yes, i saw what you did
I was right there with you
I won't let you sink
No, i forgive you
Phobic
Don't be
Grace needs a little more freedom
Phobic
Don't be
Love needs room to breathe
I have watched you grow
And i've stood in your shadow
I've never walked away
I hung the stars and
I hold your heart
So, don't ever be afraid
Yes, i know when you breathe
And i feel when you need
I won't let you sink
No, i forgive you
You can be healed
You can be free
You can know peace
Never be afraid again
Never be afraid
Never be afraid