MC68EC030FE40C Datasheet, PDF (17/36 Pages) Freescale Semiconductor, Inc – Second-Generation 32-Bit Enhanced Embedded Controller

Freescale Semiconductor, Inc.
ACCESS CONTROL
Two access control registers are provided on the MC68EC030 to control cachability of accesses for two
independent blocks of memory. Each block can range in size from 16 Mbytes to 2 Gbytes, and is
specified in the corresponding ACx register with a base address, a base mask, function code, function
code mask, and read/write mask. A typical use for an access control register is to designate a block of
memory containing I/O devices as non-cachable.
COPROCESSOR INTERFACE
The coprocessor interface is a mechanism for extending the instruction set of the M68000 Family. The
interface provided on the MC68EC030 is the same as that on the MC68020 and MC68030. Examples of
these extensions are the addition of specialized data operands for the existing data types or, for the case
of floating point, the inclusion of new data types and operations implemented by the
MC68881/MC68882 floating-point coprocessors.
SIGNAL DESCRIPTION
Figure 8 illustrates the functional signal groups, and Table 3 describe the signals and their function.
FUNCTION
CODES
ADDRESS
BUS
DATA
BUS
TRANSFER
SIZE
FC0–FC2
A0–A31
D0–D31
SIZ0
SIZ1
IPL0
IPL1
IPL2
IPEND
AVEC
BR
BG
BGACK
INTERRUPT
CONTROL
BUS ARBITRATION
CONTROL
ASYNCHRONOUS
BUS CONTROL
OCS
ECS
R/W
RMC
AS
DS
DBEN
DSACK0
DSACK1
MC68EC030
RESET
HALT
BERR
STERM
REFILL
STATUS
CDIS
BUS EXCEPTION
CONTROL
SYNCHRONOUS
BUS CONTROL
EMULATOR
SUPPORT
CACHE
CONTROL
CIIN
CIOUT
CBREQ
CBACK
CLK
VCC (10)
GND (14)
Figure 8. Functional Signal Groups
MOTOROLA
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