Datasheet

Table Of Contents
Rev. 0 | Page 59 of 112 | June 2013
ADSP-BF606/ADSP-BF607/ADSP-BF608/ADSP-BF609
TIMING SPECIFICATIONS
Specifications are subject to change without notice.
Clock and Reset Timing
Table 26 and Figure 10 describe clock and reset operations. Per
the CCLK, SYSCLK, SCLK0, SCLK1, DCLK, and OCLK timing
specifications in Table 17 on Page 53, combinations of
SYS_CLKIN and clock multipliers must not select clock rates in
excess of the processor’s maximum instruction rate.
Table 26. Clock and Reset Timing
V
DD_EXT
1.8 V/3.3 V Nominal
Parameter Min Max Unit
Timing Requirements
f
CKIN
SYS_CLKIN Frequency (using a crystal)
1,
2,
3
20 50 MHz
f
CKIN
SYS_CLKIN Frequency (using a crystal oscillator)
1,
2,
3
20 60 MHz
t
CKINL
SYS_CLKIN Low Pulse
1
6.67 ns
t
CKINH
SYS_CLKIN High Pulse
1
6.67 ns
t
WRST
SYS_HWRST Asserted Pulse Width Low
4
11 × t
CKIN
ns
1
Applies to PLL bypass mode and PLL non bypass mode.
2
The t
CKIN
period (see Figure 10) equals 1/f
CKIN
.
3
If the CGU_CTL.DF bit is set, the minimum f
CKIN
specification is 40 MHz.
4
Applies after power-up sequence is complete. See Table 27 and Figure 11 for power-up reset timing.
Figure 10. Clock and Reset Timing
SYS_CLKIN
t
WRST
t
CKIN
t
CKINL
t
CKINH
SYS_HWRST