mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 27

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

1.4
Freescale Semiconductor
active-high
active-low
asserted
deasserted
set
clear
0x0F
0b0011
x
==
P FR 4300 M AE 40
Part Number Coding
Names of signals that are active-high are shown in upper case text, without a ‘#’ symbol at the end.
Active-high signals are asserted (active) when they are high and deasserted when they are low.
A ‘#’ symbol at the end of a signal name indicates that the signal is active-low.
An active-low signal is asserted (active) when it is at the logic low level and is deasserted when it is at the
logic high level.
A signal that is asserted is in its active logic state. An active-low signal changes from high to low when
asserted; an active-high signal changes from low to high when asserted.
deasserted; an active-high signal changes from high to low when deasserted.
To set a bit means to establish logic level one on the bit.
To clear a bit means to establish logic level zero on the bit.
The prefix ‘0x’ denotes a hexadecimal number.
In certain contexts, such as a signal encoding, this indicates ‘don’t care’. For example, if a field is binary
encoded 0bx001, the state of the first bit is ‘don’t care’.
Used in equations, this symbol signifies comparison.
A signal that is deasserted is in its inactive logic state. An active-low signal changes from low to high when
The prefix ‘0b’ denotes a binary number.
Figure 1-1. Order Part Number Coding
Table 1-2. Notational Conventions
Speed Option
Package Option
Temperature Option
Device Title
Controller Family
Qualification
MFR4300 Data Sheet, Rev. 3
40 = 40 MHz
AE = 64-pin Lead Free / Halide Free LQFP
M = -40
P = Engineering Sample
M = Qualified part
o
C to +125
o
C
Introduction
27