SM320C6727B-EP Datasheet, PDF (35/109 Pages) Texas Instruments – Floating-Point Digital Signal Processor

SM320C6727B-EP
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SPRS793A – SEPTEMBER 2011 – REVISED OCTOBER 2011
4.5.1.1 Signal Transition Levels
All input and output timing parameters are referenced to 1.5 V for both "0" and "1" logic levels.
V_ref = 1.5 V
Figure 4-4. Input and Output Voltage Reference Levels for AC Timing Measurements
All rise and fall transition timing parameters are referenced to V_IL MAX and V_IH MIN for input clocks,
V_OL MAX and V_OH MIN for output clocks.
V_ref = V_IH MIN (or V_OH MIN)
V_ref = V_IL MAX (or V_OL MAX)
Figure 4-5. Rise and Fall Transition Time Voltage Reference Levels
4.5.1.2 Signal Transition Rates
All timings are tested with an input edge rate of 4 Volts per nanosecond (4 V/ns).
4.6 Timing Parameter Symbology
Timing parameter symbols used in the timing requirements and switching characteristics tables are
created in accordance with JEDEC Standard 100. To shorten the symbols, some of the pin names and
other related terminology have been abbreviated as follows:
Lowercase subscripts and their meanings:
Letters and symbols and their meanings:
a
access time
c
cycle time (period)
H
High
L
Low
d
delay time
dis
disable time
en
enable time
V
Valid
Z
High impedance
f
fall time
h
hold time
r
rise time
su
setup time
t
transition time
v
valid time
w
pulse duration (width)
X
Unknown, changing, or don't care level
Copyright © 2011, Texas Instruments Incorporated
Peripheral and Electrical Specifications
35
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