ADSP-BF561 
TIMING SPECIFICATIONS
Clock and Reset Timing
Table 16 and Figure 8 describe clock and reset operations. Per
Absolute Maximum Ratings on Page 22 , combinations of
CLKIN and clock multipliers must not result in core/system
clocks exceeding the maximum limits allowed for the processor,
including system clock restrictions related to supply voltage.
Table 16. Clock and Normal Reset Timing
Parameter
Min
Max
Unit
Timing Requirement s
t CKIN
t CKINL
t CKINH
t WRST
CLKIN (to PLL) Period 1, 2, 3
CLKIN Low Pulse
CLKIN High Pulse
RESET Asserted Pulse Width Low 4
25.0
10.0
10.0
11 × t CKIN
100.0
ns
ns
ns
ns
1
2
3
4
If DF bit in PLL_CTL register is set t CLKIN is divided by two before going to PLL, then the t CLKIN maximum period is 50 ns and the t CLKIN minimum period is 12.5 ns.
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 9 on Page 20 through Table 12
Applies after power-up sequence is complete. See Table 17 and Figure 9 for power-up reset timing.
t CKIN
CLKIN
t CKINL
t CKINH
t WRST
RESET
Figure 8. Clock and Normal Reset Timing
Table 17. Power-Up Reset Timing
Parameter
Min
Max
Unit
Timing Requirement s
t RST _ IN _ PWR
RESET Deasserted after the V DDINT , V DDEXT , and CLKIN Pins are Stable and Within
3500 × t CKIN
μ s
Specification
t RST_IN_PWR
RESET
CLKIN,
V DDINT, V DDEXT
Figure 9. Power-Up Reset Timing
Rev. E |
Page 23 of 64 |
September 2009
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