10-64
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part III. The Hardware Interface
Note that 60x bus accesses that hit a bank allocated to the local bus are transferred to the
local bus. However, local bus accesses that hit a bank allocated to the 60x bus are ignored.
10.6.1 Requests
An internal or external deviceÕs request for a memory access initiates one of the following
patterns (M
x
MR[OP] = 00):
¥
Read single-beat pattern (RSS)
¥
Read burst cycle pattern (RBS)
¥
Write single-beat pattern (WSS)
¥
Write burst cycle pattern (WBS)
These patterns are described in Section 10.6.1.1, ÒMemory Access Requests.Ó
A UPM refresh timer request pattern initiates a refresh timer pattern (PTS), as described in
Section 10.6.1.2, ÒUPM Refresh Timer Requests.Ó
An exception (caused by a soft reset or the assertion of TEA) occurring while another UPM
pattern is running initiates an exception condition pattern (EXS).
A special pattern in the RAM array is associated with each of these cycle type. Figure 10-56
shows the start addresses of these patterns in the UPM RAM, according to cycle type.
RUN
commands (M
x
MR[OP] = 11), however, can initiate patterns starting at any of the 64 UPM
RAM words.
Figure 10-56. RAM Array Indexing
Write Single-Beat Request
Read Burst Request
Read Single-Beat Request
Write Burst Request
RAM Array
Refresh Timer Request
Exception Condition Request
RSS
RBS
WSS
WBS
PTS
EXS
64 RAM
Words
Array Index
Generator
Summary of Contents for MPC8260 PowerQUICC II
Page 1: ...MPC8260UM D 4 1999 Rev 0 MPC8260 PowerQUICC II UserÕs Manual ª ª ...
Page 66: ...lxvi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA ...
Page 88: ...1 18 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Page 120: ...2 32 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Page 138: ...Part II iv MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II Configuration and Reset ...
Page 184: ...4 46 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II ConÞguration and Reset ...
Page 202: ...Part III vi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 266: ...8 34 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 382: ...10 106 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 392: ...11 10 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 430: ...Part IV viii MOTOROLA Part IV Communications Processor Module ...
Page 490: ...14 36 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 524: ...17 10 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
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Page 980: ...A 4 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Appendixes ...
Page 1002: ...Index 22 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA INDEX ...
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