Signal Description; Functional Signal Groups - Motorola MC68020 User Manual

SECTION 3

SIGNAL DESCRIPTION

This section contains brief descriptions of the input and output signals in their functional
groups, as shown in Figure 3-1. Each signal is explained in a brief paragraph with
reference to other sections that contain more detail about the signal and the related
operations.
In this section and in the remainder of the manual, assert and
negate are used to specify forcing a signal to a particular state.
In particular, assertion and assert refer to a signal that is active
or true; negation and negate indicate a signal that is inactive or
false. These terms are used independently of the voltage level
(high or low) that they represent.
FUNCTION CODES
ADDRESS BUS
TRANSFER SIZE
ASYNCHRONOUS
BUS CONTROL
EMULATOR SUPPORT
MOTOROLA
FC2–FC0
**
A31–A0
DATA BUS D31–D0
SIZ0
SIZ1
OCS
*
* ECS
R/W
RMC
AS
DS
* DBEN
DSACK0
DSACK1
CDIS
Figure 3-1. Functional Signal Groups
M68020 USER'S MANUAL
NOTE
IPL0
IPL1
IPL2
*
IPEND
AVEC
BR
BG
*
BGACK
MC68020
RESET
HALT
BERR
CLK
V
GND
INTERRU
CONTRO
BUS ARB
CONTRO
BUS EXC
CONTRO
CC
3- 1