Manual Conventions; Table 1-1 High True/Low True Signal Conventions - Motorola DSP56309 User Manual

1.3

MANUAL CONVENTIONS

This manual uses the following conventions:
¥ Bits within registers are always listed from most significant bit (MSB) to least
significant bit (LSB).
¥ Bits within a register are indicated AA[n:m], n>m, when more than one bit is
involved in a description. For purposes of description, the bits are presented as if
they are contiguous within a register. However, this is not always the case. Refer
to the programming model diagrams or to the programmerÕs sheets to see the
exact location of bits within a register.
¥ When a bit is described as Òset,Ó its value is 1. When a bit is described as
Òcleared,Ó its value is 0.
¥ The word ÒassertÓ means that a high true (active high) signal is pulled high to
V or that a low true (active low) signal is pulled low to ground. The word
CC
ÒdeassertÓ means that a high true signal is pulled low to ground or that a low true
signal is pulled high to V

Table 1-1 High True/Low True Signal Conventions

Signal/Symbol
¥ Pins or signals that are asserted low (made active when pulled to ground)
Ð In text, have an overbar. For example, RESET is asserted low.
Ð In code examples, have a tilde in front of their names. In Example 1-1 , line 3
refers to the SS0 signal (shown as ~SS0 ).
MOTOROLA
. See Table 1-1 .
CC
Logic State
1 True
PIN
PIN False
PIN True
PIN False
1. PIN is a generic term for any pin on the chip.
2. Ground is an acceptable low voltage level. See the
appropriate data sheet for the range of acceptable low
voltage levels (typically a TTL logic low).
3. V is an acceptable high voltage level. See the
CC
appropriate data sheet for the range of acceptable high
voltage levels (typically a TTL logic high).
DSP56309UM/D
Signal State Voltage
Asserted
Ground
Deasserted
V
CC
Asserted V
Deasserted Ground
DSP56309 Overview

Manual Conventions

2
3
CC
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