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4.2.2 External Bus Interface
The external bus makes it possible to use the resources of the EVB555, such as
SRAM, Flash-EEPROM or host communication expansion. The pins are used here for
addresses and data. Section 5.2. explains how the general purpose I/O lines are still
available on the EVB555.
4.3 BDM Interface
The basic debug interface of the EVB555 is the background debug mode interface
(BDM for short).
4.3.1 BDM Modes
Two variants are possible here for the support of the configurable use of the pins on
the MPC555:
Variant A - maximum debug capability
BDM pin
1
6
Variant B - maximum external bus capability
BDM pin
1
6
4.3.2 BDM/JTAG Support
Due to the double-use of the same pins on the MPC555 for the BDM and the JTAG
interface, only one of both interfaces can be used at the same time. The operating
mode is selected via the SW102 switch (BDM/Service). The relevant configuration of
the MPC555 is explained in the MPC555 User Manual.
• "BDM" setting
The BDM interface is available at the BDM connector (CO100) .
• "JTAG" setting
The JTAG interface is available at the Service connector (CO103). This is
required for test purposes (e.g. manufacture test) and for programming the EPLD.
The SW102 switch can always remain in the BDM setting when the EVB555 is oper-
ated normally.
MOTOROLA
4-16
MPC555 signal
MPC555 pin
VFLS0_MPIO3
J18
VFLS1_MPIO4
K18
MPC555 pin
MPC555 pin
IWP0_VFLS0
L2
IWP1_VFLS1
L1
EVB555
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