ADSP-2115_15 Datasheet, PDF (29/64 Pages) Analog Devices – ADSP-2100 Family DSP Microcomputers

ADSP-21xx
TIMING PARAMETERS (ADSP-2101/2105/2111/2115/2161/2163)
GENERAL NOTES
Use the exact timing information given. Do not attempt to
derive parameters from the addition or subtraction of others.
While addition or subtraction would yield meaningful results for
an individual device, the values given in this data sheet reflect
statistical variations and worst cases. Consequently, you cannot
meaningfully add parameters to derive longer times.
switching characteristics to ensure that any timing requirement
of a device connected to the processor (such as memory) is
satisfied.
Timing requirements apply to signals that are controlled by
circuitry external to the processor, such as the data input for a
read operation. Timing requirements guarantee that the
processor operates correctly with other devices.
TIMING NOTES
Switching characteristics specify how the processor changes its
signals. You have no control over this timing—circuitry external
to the processor must be designed for compatibility with these
signal characteristics. Switching characteristics tell you what the
processor will do in a given circumstance. You can also use
MEMORY REQUIREMENTS
The table below shows common memory device specifications
and the corresponding ADSP-21xx timing parameters, for your
convenience.
Memory
Device
Specification
Address Setup to Write Start
Address Setup to Write End
Address Hold Time
Data Setup Time
Data Hold Time
OE to Data Valid
Address Access Time
ADSP-21xx
Timing
Parameter
t_ASW
t_AW
t_WRA
t_DW
t_DH
t_RDD
t_AA
Timing
Parameter
Definition
A0–A13, DMS, PMS Setup before WR Low
A0–A13, DMS, PMS Setup before WR Deasserted
A0–A13, DMS, PMS Hold after WR Deasserted
Data Setup before WR High
Data Hold after WR High
RD Low to Data Valid
A0–A13, DMS, PMS, BMS to Data Valid
REV. B
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