ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
TIMING SPECIFICATIONS
Specifications are subject to change without notice.
Clock and Reset Timing
Table 32 and Figure 9 describe clock and reset operations. Per
the CCLK and SCLK timing specifications in Table 12 to
Table 17 , combinations of CLKIN and clock multipliers must
not select core/peripheral clocks in excess of the processor's
maximum instruction rate.
Table 32. Clock and Reset Timing
Parameter
Min
Max
Unit
Timing Requirement s
f CKIN
CLKIN Frequency (Commercial/ Industrial Models) 1, 2, 3, 4 12
50
MHz
CLKIN Frequency (Automotive Models)
1, 2, 3, 4
14
50
MHz
t CKINL
CLKIN Low Pulse
10
ns
t CKINH
CLKIN High Pulse 1
10
ns
t WRST
RESET Asserted Pulse Width Low
5
11 × t CKIN
ns
Switching Characteristic
t BUFDLAY
CLKIN to CLKBUF Delay
10
ns
1
2
3
4
5
Applies to PLL bypass mode and PLL nonbypass mode.
Combinations of the CLKIN frequency and the PLL clock multiplier must not exceed the allowed f VCO , f CCLK , and f SCLK settings discussed in Table 12 on Page 29 through
Table 14 on Page 29 and Table 15 on Page 31 through Table 17 on Page 31 .
The t CKIN period (see Figure 9 ) equals 1/f CKIN .
If the DF bit in the PLL_CTL register is set, the minimum f CKIN specification is 24 MHz for commercial/industrial models and 28 MHz for automotive models.
Applies after power-up sequence is complete. See Table 33 and Figure 10 for power-up reset timing.
t CKIN
CLKIN
t CKINL
t CKINH
t BUFDLAY
t BUFDLAY
CLKBUF
t WRST
RESET
Figure 9. Clock and Reset Timing
Rev. D |
Page 39 of 88 | July 2013
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