MOTOROLA
Chapter 10. Memory Controller
10-79
Part III. The Hardware Interface
Figure 10-66. Wait Mechanism Timing for Internal and External Synchronous
Masters
10.6.4.6 Extended Hold Time on Read Accesses
Slow memory devices that take a long time to turn off their data bus drivers on read accesses
should chose some combination of OR
x
[EHTR]. Accesses after a read access to the slower
memory bank is delayed by the number of clock cycles speciÞed by Table 10-31. The
information in Section 10.5.1.6, ÒExtended Hold Time on Read Accesses,Ó provides
additional information.
10.6.5 UPM DRAM ConÞguration Example
Consider the following DRAM organization:
¥
64-bit port size organized as 8 x 8 x 16 Mbits
¥
Each device has 12 row lines and 9 column lines.
CSx
GPL1
WAEN
Word n
Word n+1
c1
c2
c3
c4
c5
c6
c7
c8
UPWAIT
c9 c10 c11
c12
c13 c14
Word n+2
Wait
Wait
Word n+3
PSDVAL
CLKIN
T1
T2
T3
T4
A
B
C
D
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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