SCF5249 Datasheet, PDF (13/56 Pages) Freescale Semiconductor, Inc – Integrated ColdFire Microprocessor

Document Name
CFPRM/D
ColdFire2UM
ColdFire2UMAD
SCF5249UM
Table 3. SCF5249 Documentation
Description
ColdFire Family Programmer’s Reference Manual
Version 2/2M ColdFire Core
Processor User’s Manual
Version 2/2M ColdFire Core
Processor User’s Manual Addendum
SCF5249 User’s Manual
Signal Descriptions
Order Number
CFPRM/D
ColdFire2UM/D
ColdFire2UMAD/D
SCF5249UM/D
8 Signal Descriptions
8.1 Introduction
This section describes the SCF5249 input and output signals. The signal descriptions as shown in Table 4
are grouped according to relevant functionality.
Table 4. SCF5249 Signal Index
Signal Name
Address
Read-write control
Mnemonic
A[23:1]
A[25]/GPO8
RW_b
Output enable
OE
Data
D[31:16]
Synchronous row address SDRAS
strobe
Synchronous column
address strobe
SDCAS
SDRAM write enable
SDWE
SDRAM upper byte
enable
SDUDQM
SDRAM lower byte enable SDLDQM
SDRAM chip selects
SDRAM chip selects
SDRAM clock enable
System clock
SDRAMCS1
SDRAMCS2/GPIO7
BCLKE
SCLK/GPIO10
Function
Input/ Reset
Output State
23 address lines, address line 25
multiplexed with gpo8.
Bus write enable - indicates if read or
write cycle in progress
Output enable for asynchronous
memories connected to chip selects
Data bus used to transfer word data
Row address strobe for external
SDRAM.
Column address strobe for external
SDRAM
Write enable for external SDRAM
Indicates during write cycle if high
byte is written
Indicates during write cycle if low byte
is written
SDRAM chip select
SDRAM chip select
SDRAM clock enable
SDRAM clock output
Out
Out
Out
In/Out
Out
Out
Out
Out
Out
Outt
In/Out
Out
In/Out
X
H
negated
Hi-Z
negated
negated
negated
negated
negated
SCF5249 Integrated ColdFire® Microprocessor Data Sheet, Rev. 3
Freescale Semiconductor
13