mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 397

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

15.5.1 Requests
The user-programmable machine has four basic requests that can initiate a UPM cycle.
There is a special start address in the RAM array that is associated with each of the following
cycle types:
Figure 15-21 illustrates the first locations addressed by the UPM, according to the different
cycle types. Software requests, however, can point to any of the 64 UPM RAM entries.
• Read single beat start address (RSS)
• Read burst cycle start address (RBS)
• Write single beat start address (WSS)
• Write burst cycle start address (WBS)
• Periodic timer start address (PTS)
• Exception condition start address (EXS)
READ SINGLE BEAT REQUEST
BURST READ REQUEST
WRITE SINGLE BEAT REQUEST
PERIODIC TIMER REQUEST
EXCEPTION CONDITION
BURST WRITE REQUEST
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Figure 15-21. RAM Array Indexing
MPC823 REFERENCE MANUAL
GENERATOR
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INDEX
ARRAY
RSS
RBS
WSS
WBS
PTS
EXS
RAM ARRAY
Memory Controller
WORDS
RAM
64
15-41