6-80
MPC8240 Integrated Processor User’s Manual
ROM/Flash Interface Operation
ROMFAL and ROMNAL are configured to their maximum value at reset in order to
accommodate initial boot code fetches. The MCCR1[BURST] configuration bit is cleared
at reset. ROM interface timing configuration, and use of the ROMFAL and ROMNAL
parameters, are shown in Figure 6-55, Figure 6-56, and Figure 6-57.
Figure 6-55. Read Access Timing for Non-Burst ROM/Flash Devices in
32- or 64-Bit Mode
Figure 6-56. Read Access Timing (Cache Block) for Burst ROM/Flash Devices
in 64-Bit Mode
MCLK
A[0:1]
A[2:19]
FOE, RCSn
DATA
3 cycles
3 cycles
3 cycles
ROMFAL
ROMFAL
ROMFAL
D0
D1
D2
Data sampled
ROMFAL (ROM first access latency) = 3–34 clocks
MCCR1[BURST] = 0 (default value at reset)
(constant)
(constant)
(constant)
MCLK
A[0:1]
A[2:19]
FOE, RCSn
DATA
3 cycles
Data sampled
ROMFAL (ROM first access latency) = 3–34 clocks
MCCR1[BURST] = 1
D0
D1
D2
D3
2 cycles
2 cycles
2 cycles
ROMNAL (ROM nibble access latency) = 0–9 clocks
ROMFAL
ROMNAL
(constant)
(constant)
(constant)
ROMNAL
ROMNAL
(constant)
3 cycles
(constant)
Summary of Contents for MPC8240
Page 1: ...MPC8240UM D Rev 1 1 2001 MPC8240 Integrated Processor User s Manual ...
Page 38: ...xviii MPC8240 Integrated Processor User s Manual TABLES Table Number Title Page Number ...
Page 48: ...xlviii MPC8240 Integrated Processor User s Manual Acronyms and Abbreviations ...
Page 312: ...6 94 MPC8240 Integrated Processor User s Manual ROM Flash Interface Operation ...
Page 348: ...7 36 MPC8240 Integrated Processor User s Manual PCI Host and Agent Modes ...
Page 372: ...8 24 MPC8240 Integrated Processor User s Manual DMA Register Descriptions ...
Page 394: ...9 22 MPC8240 Integrated Processor User s Manual I2O Interface ...
Page 412: ...10 18 MPC8240 Integrated Processor User s Manual Programming Guidelines ...
Page 454: ...12 14 MPC8240 Integrated Processor User s Manual Internal Arbitration ...
Page 466: ...13 12 MPC8240 Integrated Processor User s Manual Exception Latencies ...
Page 516: ...16 14 Watchpoint Trigger Applications ...
Page 538: ...B 16 MPC8240 Integrated Processor User s Manual Setting the Endian Mode of Operation ...
Page 546: ...C 8 MPC8240 Integrated Processor User s Manual ...
Page 640: ...INDEX Index 16 MPC8240 Integrated Processor User s Manual ...