Start-up System Configuration
PHYTEC Messtechnik GmbH 2005 L-645e_1
37
5
System Start-Up Configuration
During the reset cycle, the ColdFire processor reads the state of the
local FlexBUS address/data lines to determine the basic system
configuration. The configuration circuitry (pull-up or pull-down
resistors) is located on the phyCORE module. The processor’s
FlexBus lines are not directly connected to the phyCORE connector
which makes this a very safe procedure since no external circuitry can
overwrite these system startup values.
The system start-up configuration includes:
•
Clock configuration
•
Basic FlexBus characteristic for boot memory configuration
•
BDM/JTAG configuration
The following default configuration is read by the processor with the
rising edge of reset line /RSTI.
FlexBus
Line
Logic
Level
Description
Default
FB_AD0
FB_AD1
0
0
PSCONFIG
Port Size Configuration of /FB_CS0
connected to Boot Flash Memory
32-bit port
FB_AD2
1
AACONFIG
Auto Acknowledge Configuration
for /FB_CS0
63 wait states enabled
FB_AD3
1
BECONFIG
Byte Enable Configuration
Byte write enable
/FB_BWE[3..0]
FB_AD4
1
FBMODE
FlexBus Operating Mode
Multiplexed FlexBus and PCI
bus on PCI_AD[31..0]
FB_AD5
0
FBSIZE
FlexBus Size Configuration
/FB_BWE[3..0] are used for
byte strobe and not for
TSIZE[1..0] and FB_AD[1..0]
FB_AD6
FB_AD7
reserved
FB_AD8
FB_AD9
FB_AD10
FB_AD11
FB_AD12
1
1
0
0
0
CLKCONFIG[4..0]
CLKIN to SDCLK Ratio
Ratio 1:2
50MHz CLKIN
100MHz int.
200MHz Core
Table 3:
System Start-up Configuration
Summary of Contents for phyCORE-MCF548x
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