Chapter 6. MPC8240 Memory Interface
6-73
ROM/Flash Interface Operation
6.4 ROM/Flash Interface Operation
For the ROM/Flash interface, the MPC8240 provides 21 address bits, two chip selects, one
Flash output enable (FOE), and one flash write enable (WE).
Figure 6-49 displays a block diagram of the ROM interface.
Figure 6-49. ROM Memory Interface Block Diagram
Figure 6-50 shows an example of a 16-Mbyte ROM system.
ROM/Flash
ROM/Flash
Address
Address
ROM/Flash Memory
External 60x data from ROM
Central Control Unit
ROM/Flash Memory Interface
ROM Memory Array
Data Pins
MDH[0:31]
MDL[0:31]
Control
MUX
AR[20:0]
RCS0
RCS1
Row
Col
FOE
(Processor or PCI)
ROM/Flash
ROM/Flash
Address
Address
ROM/Flash Memory
External 60x data from ROM
Central Control Unit
ROM/Flash Memory Interface
ROM Memory Array
Data Pins
MDH[0:31]
MDL[0:31]
Control
MUX
AR[23:0]
RCS0
RCS1
Row
Col
RCS2
(Processor or PCI)
RCS3
Содержание MPC8240
Страница 1: ...MPC8240UM D Rev 1 1 2001 MPC8240 Integrated Processor User s Manual ...
Страница 38: ...xviii MPC8240 Integrated Processor User s Manual TABLES Table Number Title Page Number ...
Страница 48: ...xlviii MPC8240 Integrated Processor User s Manual Acronyms and Abbreviations ...
Страница 312: ...6 94 MPC8240 Integrated Processor User s Manual ROM Flash Interface Operation ...
Страница 348: ...7 36 MPC8240 Integrated Processor User s Manual PCI Host and Agent Modes ...
Страница 372: ...8 24 MPC8240 Integrated Processor User s Manual DMA Register Descriptions ...
Страница 394: ...9 22 MPC8240 Integrated Processor User s Manual I2O Interface ...
Страница 412: ...10 18 MPC8240 Integrated Processor User s Manual Programming Guidelines ...
Страница 454: ...12 14 MPC8240 Integrated Processor User s Manual Internal Arbitration ...
Страница 466: ...13 12 MPC8240 Integrated Processor User s Manual Exception Latencies ...
Страница 516: ...16 14 Watchpoint Trigger Applications ...
Страница 538: ...B 16 MPC8240 Integrated Processor User s Manual Setting the Endian Mode of Operation ...
Страница 546: ...C 8 MPC8240 Integrated Processor User s Manual ...
Страница 640: ...INDEX Index 16 MPC8240 Integrated Processor User s Manual ...