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TMS320C6670 Peripheral Information and Electrical Specifications
Copyright 2012 Texas Instruments Incorporated
SPRS689D—March 2012
Multicore Fixed and Floating-Point System-on-Chip
TMS320C6670
7.2.4 SmartReflex
Increasing the device complexity increases its power consumption and with the smaller transistor structures
responsible for higher achievable clock rates and increased performance, comes an inevitable penalty: increasing
leakage currents. Leakage currents are present in any active circuit, independent of clock rates and usage scenarios.
This static power consumption is mainly determined by transistor type and process technology. Higher clock rates
also increase dynamic power, the power used when transistors switch. The dynamic power depends mainly on a
specific usage scenario, clock rates, and I/O activity.
Texas Instruments SmartReflex technology is used to decrease both static and dynamic power consumption while
maintaining the device performance. SmartReflex in the TMS320C6670 device is a feature that allows the core
voltage to be optimized based on the process corner of the device. This requires a voltage regulator for each
TMS320C6670 device.
To guarantee maximizing performance and minimizing power consumption of the device, SmartReflex is required
to be implemented whenever the TMS320C6670 device is used. The voltage selection is done using 4 VCNTL pins
which are used to select the output voltage of the core voltage regulator.
For information on implementation of SmartReflex see the
DSP Power Consumption Summary for KeyStone Devices
Application Report
and the
Hardware Design Guide for KeyStone Devices
2.9 ‘‘Related Documentation from
Texas Instruments’’ on page 66
Figure 7-3
SmartReflex 4-Pin VID Interface Timing
Table 7-5
SmartReflex 4-Pin VID Interface Switching Characteristics
(see
)
No.
Parameter
Min
Max
Unit
1
td(VCNTL[2:0]-VCNTL[3])
Delay time - VCNTL[2:0] valid after VCNTL[3] low
300.00
ns
2
toh(VCNTL[3]-VCNTL[2:0])
Output hold time - VCNTL[2:0] valid after VCNTL[3]
0.07
172020C
(1)
1 C = 1/SYSCLK1 frequency (See
)in ms
ms
3
td(VCNTL[2:0]-VCNTL[3])
Delay time - VCNTL[2:0] valid after VCNTL[3] high
300.00
ns
4
toh(VCNTL[3]-VCNTL[2:0)
Output hold time - VCNTL[2:0] valid after VCNTL[3] high
0.07
172020C
ms
End of Table 7-5
VCNTL[2:0]
VCNTL[3]
1
2
4
LSB VID[2:0]
MSB VID[5:3]
3
Содержание TMS320C6670
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