scf5250 Freescale Semiconductor, Inc, scf5250 Datasheet - Page 9

• Manufacturer Part Number: scf5250
• Description: Scf5250 Integrated Coldfire Microprocessor Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

4
4.1
This section describes the SCF5250 input and output signals. The signal descriptions as shown in Table
2-A are grouped according to relevant functionality.
Address
Read-write control
Output enable
Data
Synchronous row address
strobe
Synchronous column
address strobe
SDRAM write enable
SDRAM upper byte enable SDUDQM/GPO53
SDRAM lower byte enable SDLDQM/GPO52
SDRAM chip selects
SDRAM clock enable
System clock
Freescale Semiconductor
Signal Name
Document Name
ColdFire2UMAD
Signal Descriptions
Introduction
ColdFire2UM
SCF5250UM
CFPRM/D
A[24:1]
A[23]/GPO54
R/W
OE
D[31:16]
SDRAS/GPIO59
SDCAS/GPIO39
SDWE/GPIO38
SD_CS0/GPIO60
BCLKE/GPIO63
BCLK/GPIO40
SCF5250 Integrated ColdFire® Microprocessor Data Sheet, Rev. 1.1
ColdFire Family Programmer’s Reference Manual
Mnemonic
Table 2. SCF5250 Documentation
Processor User’s Manual Addendum
Table 3. SCF5250 Signal Index
Version 2/2M ColdFire Core
Version 2/2M ColdFire Core
Processor User’s Manual
SCF5250 User’s Manual
Description
.
24 address lines, address line 23
multiplexed with GPO54 and address
24 is multiplexed with A20 (SDRAM
access only).
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 clock enable
SDRAM clock output
Function
ColdFire2UMAD/D
ColdFire2UM/D
Order Number
SCF5250UM/D
CFPRM/D
Signal Descriptions
Output
Input/
In/Out
In/Out
In/Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
negated
negated
negated
negated
negated
Reset
State
Hi-Z
X
H
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