AN1154 STMicroelectronics, AN1154 Datasheet - Page 76

• Manufacturer Part Number: AN1154
• Description: 8031-PSD DESIGN TUTORIAL
• Manufacturer: STMicroelectronics

AN1154 - APPLICATION NOTE
This appendix compares the two circuits of Figure 2 and Figure 3 in the following categories:
(Only the major ICs are compared here.)
COST
The 150 ns M8813F1x in the PLCC package can be purchased at a significantly lower price than the total
cost of the individual EEPROM, Flash, SRAM, and CPLD devices.
AVERAGE CURRENT USAGE
The M88x3Fxx would typically use 4.29 mA according to the “Example of M88x3Fxx Typical Power
Calculation at V
If we take the total average current of the devices in the discrete solution, we get 32.4 mA (with the
EPM7064S not in turbo mode). This shows that the discrete solution uses 755% more current than the
PLD.
BOARD SPACE USAGE
The M8813F1x in the PLCC package takes up 400 mm
up a combined 1493 mm
on PLCC packages.) This calculation does not reflect the extra board space, complexity, and noise
associated with routing the signals in the discrete solution.
TIME TO MARKET
The time to market will be reduced significantly for many reasons:
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APPENDIX E: COMPARING THE DISCRETE AND INTEGRATED SOLUTIONS
Cost
Average Current Usage
Board Space Usage
Time to market
The integrated PSD solution involves one complex integrated circuit, not four.
There are templates and predefined routines that, when used in conjunction with our user-friendly
PSDsoft, help you with every step of your design process.
Issues related to concurrent memory, memory mapping, and MCU assisted ISP are simplified.
C code is generated for you.
The JTAG interface is one of the greatest benefits and time savers. It allows you to program, configure,
and test the entire PSD, and leave it soldered to the board the whole time.
There are just fewer places to go wrong, and fewer things to debug when you have this level of
integration.
CC
= 5.0 V” in the “AC and DC Parameters” sections of the M88 FLASH+PSD Data Sheet .
2
. That equates to 373% more board space. (All calculations have been based
2
. The chips that make up the discrete solution take