ADSP-21262 Datasheet, PDF (17/44 Pages) Analog Devices – SHARC Processor

CLKIN
XTAL
XTAL
OSC
PLLICLK
PLL
3:1, 8:1,
16:1
CLKOUT
CCLK
(CORE CLOCK)
CLK-CFG [1:0]
Figure 5. Core Clock and System Clock Relationship to CLKIN
ADSP-21262
Switching characteristics specify how the processor changes its
signals. Circuitry external to the processor must be designed for
compatibility with these signal characteristics. Switching char-
acteristics describe what the processor will do in a given
circumstance. Use switching characteristics to ensure that any
timing requirement of a device connected to the processor (such
as memory) is satisfied.
Timingrequirements apply to signals that are controlled by cir-
cuitry external to the processor, such as the data input for a read
operation. Timing requirements guarantee that the processor
operates correctly with other devices.
Rev. A | Page 17 of 44 | May 2004