afs600 Actel Corporation, afs600 Datasheet - Page 245

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

Example of Power Calculation
This example considers a shift register with 5,000 storage tiles, including a counter and memory that stores analog
information. The shift register is clocked at 50 MHz and stores and reads information from a RAM.
The device used is a commercial AFS600 device operating in typical conditions.
The calculation below uses the power calculation methodology previously presented and shows how to determine the
dynamic and static power consumption of resources used in the application.
Also included in the example is the calculation of power consumption in operating, standby, and sleep modes to
illustrate the benefit of power-saving modes.
Global Clock Contribution—P
Logic—Sequential Cells, Combinational Cells, and Routing Net Contributions—P
Operating Mode
P
P
P
Standby Mode and Sleep Mode
P
Operating Mode
P
P
P
P
P
P
P
P
P
P
P
P
CLOCK
CLOCK
CLOCK
CLOCK
S-CELL
S-CELL
S-CELL
C-CELL
C-CELL
C-CELL
NET
NET
NET
LOGIC
LOGIC
LOGIC
F
Number of sequential VersaTiles: N
Estimated number of Spines: N
Estimated number of Rows: N
F
Number of sequential VersaTiles: N
Number of combinatorial VersaTiles: N
Estimated toggle rate of VersaTile outputs:
CLK
CLK
= (N
= (5,000 + 6,000) * (0.1 / 2) * 0.0007 * 50
= 19.25 mW
= P
= 21.13 mW + 4.35 mW + 19.25 mW
= 44.73 mW
= N
= 5,000 * (0.00007 + (0.1 / 2) * 0.00029) * 50
= 21.13 mW
= N
= 6,000 * (0.1 / 2) * 0.00029 * 50
= 4.35 mW
= (P
= (0.0128 + 5 * 0.0019 + 313 * 0.00081 + 5,000 * 0.00011) * 50
= 41.28 mW
= 0 W
= 50 MHz
= 50 MHz
S-CELL
S-CELL
S-CELL
C-CELL
AC1
+ N
+ N
+ P
* (P
* (
C-CELL
SPINE
α
C-CELL
AC5
1
/ 2) * P
+ (
* P
) * (
+ P
α
AC2
1
α
NET
AC7
CLOCK
/ 2) * P
1
+ N
/ 2) * P
* F
ROW
ROW
SPINES
CLK
AC6
AC8
* PAC3 + N
) * F
= 313
S-CELL
S-CELL
* F
= 5
CLK
C-CELL
CLK
= 5,000
= 5,000
α
S-CELL
= 6,000
1
A d v an c ed v1 . 4
= 0.1 (10%)
* P
AC4
) * F
CLK
Actel Fusion Programmable System Chips
S-CELL
, P
C-CELL
, and P
NET
3-21