MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 679
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MPC8544COMEDEV
Manufacturer Part Number
MPC8544COMEDEV
Description
KIT DEV EXPRESS MPC8544COM
Manufacturer
Freescale Semiconductor
Type
MPUr
Datasheets
1.MPC8544VTALF.pdf
(117 pages)
2.MPC8544VTALF.pdf
(2 pages)
3.MPC8544VTALF.pdf
(1340 pages)
Specifications of MPC8544COMEDEV
Contents
Board
For Use With/related Products
MPC8544
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Figure 14-53
The following events initiate a UPM cycle:
The RAM array contains 64 words of 32-bits each. The signal timing generator loads the RAM word from
the RAM array to drive the general-purpose lines, byte-selects, and chip-selects. If the UPM reads a RAM
word with WAEN set, the external LUPWAIT signal is sampled and synchronized by the memory
controller and the current request is frozen.
14.4.4.1
A special pattern location in the RAM array is associated with each of the possible UPM requests. An
internal device’s request for a memory access initiates one of the following patterns (MxMR[OP] = 00):
Freescale Semiconductor
•
•
•
•
•
•
•
Any internal device requests an external memory access to an address space mapped to a
chip-select serviced by the UPM
A UPM refresh timer expires and requests a transaction, such as a DRAM refresh
A bus monitor time-out error during a normal UPM cycle redirects the UPM to execute an
exception sequence
Read single-beat pattern (RSS)
Read burst cycle pattern (RBS)
Write single-beat pattern (WSS)
Write burst cycle pattern (WBS)
LUPWAIT
shows the basic operation of each UPM.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
If the LGPL4/LGTA/LUPWAIT/LPBSE signal is used as both an input and
an output, a weak pull-up is required. Refer to the hardware specification for
details regarding termination options.
Memory Access Request
UPM Requests
Figure 14-53. User-Programmable Machine Functional Block Diagram
(issued in software)
Exception Request
Internal / External
Run Command
Timer Request
UPM Refresh
Request
Logic
Wait
Hold
Generator
WAEN Bit
Index
Array
NOTE
(LAST = 0)
Increment
Index
Index
Internal Controls
Internal
Signals
Latch
RAM Array
Generator
Signals
Timing
LGPL n
LBS n
LCS n
Local Bus Controller
14-59
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