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5.1 Using External Resources
The external resources on the board (RAM, Flash-EEPROM, PRU) can be addressed
through the external bus interface. The selection takes place via chip select signals.
Figure 5-1 shows the connection of the external devices to the most important bus
control signals of the MPC555.
/OE
/CS0
MPC555
/WE_AT[0:3]
/CS3
/CS1
RD_/WR
TSIZ[0:1]
/CS2
Figure 5-1 Using external resources on the EVB 555
EVB555
Quick Reference
SECTION 5
Working with the EVB555
EPLD
A[8:15],
A[28:31]
D[0:7]
V
CC3
/ExtBus
SW100-6
/OE
A[8:31]
Bus
Switch
D[0:31]
/SGF_SEL
/SGEOF
/SGCSF
/OE
/SGWCS
/WE[0:3]
1
1)
2
3
/CSR
/CSPB
1
1)
2
3
/SGHCE
PDIR[0:7]
/POE[A,B], /PLE[A,B]
/PRUOE, /PRUDIR
A[8:31]
PRU
D[0:31]
1)
default: 1-2 connected
Flash
RAM
/SGCSM
/SGWE[0:3]
/SGCSF
ETK
/SGWCS
/SGOE
/SGEOF
Piggyback
RAM
/SGCSR
Host
Communication
Expansion
/WE[0:3]
A_PIO[0:31],
B_PIO[0:31]
MOTOROLA
5-23
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