Table of Contents
Advertisement
Table 14-1 lists the MCF5282 signals grouped by functionality.
The primary functionality of a pin is not necessarily its default
functionality. Pins that are muxed with GPIO will default to
their GPIO functionality.
Signal Name
Address
Data
Byte strobes
Output enable
Transfer acknowledge
Transfer error
acknowledge
Read/Write
Transfer size
Transfer start
Transfer in progress
Chip selects
SDRAM row
address strobe
SDRAM column
address strobe
MOTOROLA
NOTE:
Table 14-1. MCF5282 Signal Description
Abbreviation
External Memory Interface
A[23:0]
Define the address of external byte,
word, longword, and 16-byte burst
accesses.
D[31:0]
Data bus. Provide the general
purpose data path between the MCU
and all other devices.
BS[3:0]
Define the byte lane of data on the
data bus.
OE
Indicates when an external device can
drive data on the bus.
TA
Indicates that the external data
transfer is complete and should be
asserted for one clock.
TEA
Indicates that an error condition exists
for the bus transfer.
R/W
Indicates the direction of the data
transfer on the bus.
SIZ[1:0]
Specify the data access size of the
current external bus reference.
TS
Asserted during the first CLKOUT
cycle of a transfer when address and
attributes are valid.
TIP
Asserted to indicate that a bus
transfer is in progress. Negated during
idle bus cycles.
CS[6:0]
Programmed for a base address
location and for masking addresses,
port size and burst capability
indication, wait state generation, and
internal/external termination.
SDRAM Controller Signals
SRAS
SDRAM synchronous row address
strobe.
SCAS
SDRAM synchronous column address
strobe.
Chapter 14. Signal Descriptions
Function
Overview
I/O
Page
I/O
14-18
I/O
14-18
I/O
14-19
O
14-19
I
14-19
I
14-19
I/O
14-19
O
14-19
O
14-20
O
14-20
O
14-20
O
14-21
O
14-21
14-3
Advertisement
Table of Contents
