ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
Table 11 shows settings for TWI_DT in the NONGPIO_DRIVE
register. Set this register prior to using the TWI port.
Table 11. TWI_DT Field Selections and V DDEXT /V BUSTWI
TWI_DT
000 (default) 1
001
010
011
100
101
110
111 (reserved)
V DDEXT Nominal
3.3
1.8
2.5
1.8
3.3
1.8
2.5
V BUSTWI Min
2.97
1.7
2.97
2.97
4.5
2.25
2.25
V BUSTWI Nominal
3.3
1.8
3.3
3.3
5
2.5
2.5
V BUSTWI Max
3.63
1.98
3.63
3.63
5.5
2.75
2.75
Unit
V
V
V
V
V
V
V
1
Designs must comply with the V DDEXT and V BUSTWI voltages specified for the default TWI_DT setting for correct JTAG boundary scan operation during reset.
Clock Related Operating Conditions
for ADSP-BF522/ADSP-BF524/ADSP-BF526 Processors
Table 12 describes the core clock timing requirements for the
ADSP-BF522/ADSP-BF524/ADSP-BF526 processors. Take care
in selecting MSEL, SSEL, and CSEL ratios so as not to exceed the
maximum core clock and system clock (see Table 14 ). Table 13
describes phase-locked loop operating conditions.
Table 12. Core Clock (CCLK) Requirements (All Instruction Rates 1 ) for ADSP-BF522/ADSP-BF524/ADSP-BF526 Processors
Parameter
Nominal Voltage Setting
Max
Unit
f CCLK
f CCLK
Core Clock Frequency (V DDINT =1.33 V minimum)
Core Clock Frequency (V DDINT = 1.235 V minimum)
1.40 V
1.30 V
400 2
300
MHz
MHz
1
2
Applies to 400 MHz models only. See the Ordering Guide on Page 88 .
Table 13. Phase-Locked Loop Operating Conditions for ADSP-BF522/ADSP-BF524/ADSP-BF526 Processors
Parameter
Min
Max
Unit
f VCO
Voltage Controlled Oscillator (VCO) Frequency
70
Instruction Rate 1
MHz
1
Table 14. SCLK Conditions for ADSP-BF522/ADSP-BF524/ADSP-BF526 Processors
V DDEXT /V DDMEM
1.8 V Nominal 1
V DDEXT /V DDMEM
2.5 V or 3.3 V Nominal
Parameter
Max
Max
Unit
f SCLK
f SCLK
CLKOUT/SCLK Frequency (V DDINT ≥ 1.33 V) 2
CLKOUT/SCLK Frequency (V DDINT < 1.33 V)
80
80
100
80
MHz
MHz
1
2
If either V DDEXT or V DDMEM are operating at 1.8 V nominal, f SCLK is constrained to 80 MHz.
f SCLK must be less than or equal to f CCLK and is subject to additional restrictions for SDRAM interface operation. See Table 37 on Page 47 .
Rev. D |
Page 29 of 88 | July 2013
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