
MOTOROLA
Chapter 16. Memory Controller
16-47
Part IV. Hardware Interface
16.6.4.8 Transfer Acknowledge and Data Sample Control (UTA, DLT3)
During a memory access, the UTA bit of the RAM word controls the state of TA driven by
the UPM. TA is driven on the rising edge of GCLK2_50. Therefore, because TA is also
sampled on the rising edge of GCLK2_50, programming UTA to assert in the RAM word
causes the bus master to sample TA as asserted in the next cycle.
When a read access is handled by the UPM and the UTA bit is 0, the value of the DLT3 bit
in the same RAM word indicates when the data input is sampled by the internal bus master,
assuming that MxMR[GPLx4DIS] = 1.
¥
If G4T4/DLT3 functions as DLT3 and DLT3 = 1 in the RAM word, data is latched
on the falling edge of GCLK2_50 instead of the rising edge, which is normal. This
feature lets the user speed up the memory interface by latching data 1/2 clock early,
which can be useful during burst reads. This feature should be used only in systems
without external synchronous bus devices.
32 bits
256 Kbyte
8
8
A22ÐA29
000
512 Kbyte
9
A21ÐA29
1 Mbyte
10
A20ÐA29
2 Mbyte
11
A19ÐA29
4 Mbyte
12
A18ÐA29
1 Mbyte
9
9
A21ÐA29
001
2 Mbyte
10
A20ÐA29
4 Mbyte
11
A19ÐA29
8 Mbyte
12
A18ÐA29
16 Mbyte
13
A17ÐA29
4 Mbyte
10
10
A20ÐA29
010
8 Mbyte
11
A19ÐA29
16 Mbyte
12
A18ÐA29
32 Mbyte
13
A17ÐA29
64 Mbyte
14
A16ÐA29
16 Mbyte
11
11
A19ÐA29
011
32 Mbyte
12
A18ÐA29
64 Mbyte
13
A17ÐA29
64 Mbyte
12
12
A18ÐA29
100
128 Mbyte
13
A17ÐA29
256 Mbyte
14
A16ÐA29
256 Mbyte
13
13
A17ÐA29
101
Table 16-18. AMA/AMB Definition for DRAM Interface (Continued)
Data Bus
Width
Memory Size
DRAM Address Pin Number
MPC860 Address
Pin Connection
AMx
Row Column
Summary of Contents for MPC860 PowerQUICC
Page 3: ...MPC860UM AD 07 98 REV 1 MPC860 PowerQUICC ª UserÕs Manual ...
Page 36: ...xxxvi MPC860 PowerQUICC UserÕs Manual MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 78: ...I iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 88: ...1 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 114: ...3 16 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 226: ...8 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 262: ...9 36 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 274: ...III iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
Page 320: ...12 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
Page 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
Page 326: ...IV vi MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 352: ...13 26 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 394: ...14 42 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 426: ...15 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 530: ...17 26 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 632: ...21 44 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 660: ...22 28 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 708: ...24 24 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 748: ...27 20 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 846: ...31 20 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 914: ...35 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 948: ...36 34 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 998: ...37 48 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part VI Debug and Test ...
Page 1016: ...A 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1024: ...B 8 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1030: ...C 6 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1086: ...Glossary 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA ...
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