Block Diagram
http://www.motorola.com/computer/literature
3-19
3
Note
*For replacement of fuses F1, F2, or F3 contact: Littelfuse, Inc.
800 E. Northwest Highway, Des Plaines, IL, 60016-3096. Order
part number 452005 (5A), or 45202.5 (2.5A).
Speaker Control
The MCP750 base board supplies a
SPEAKER_OUT
signal to the transition
module. The transition module contains a two pin jumper header (J13)
which allows the
SPEAKER_OUT
signal to be cabled to an external speaker
to obtain a beep tone.
MPC750 Processor
The MCP750 is designed to support the enhanced version of the MPC750
360-pin BGA processor chip with 16MB to 256MB of ECC DRAM, 1MB
of level 2 cache (L2 cache), and up to 9MB of Flash memory. The L2 cache
and 1MB of 16-bit Flash memory reside on the MCP750 base board. The
ECC DRAM and 4MB or 8MB of additional (64-bit) Flash memory are
located on the RAM300 memory mezzanine.
The MPC750 is a 64-bit processor with 64KB on-chip cache (32KB data
cache and 32KB instruction cache). The L2 cache is implemented with an
on-chip, two way set associative tag memory and with external
synchronous SRAMs for data storage.
R21
Poly-
switch
VIO for onboard voltage and to J3 Transition module
connector
1.1A
R23
Poly-
switch
–12Vdc to J11 PMC connector and J3 Transition
module connector
2A
R33
Poly-
switch
+5Vdc to J17 USB Channel 1 connector
1.1A
R49
Poly-
switch
+5Vdc to J18 USB Channel 0 connector
1.1A
Table 3-3. Fuse Assignments
Fuse#
Type
Voltage/Purpose/J Number
Fuse
Rating