
FlexBus
17-14
Freescale Semiconductor
NOTE
Throughout this chapter FB_D[31:
X
] indicates a 32-, 16-, or 8-bit wide data bus.
Figure 17-7. Read Cycle Flowchart
The read cycle timing diagram is shown in
.
NOTE
In the next set of timing diagrams, the dotted lines indicate FB_TA, FB_OE,
and FB_CS
n
timing when internal termination is used (CSCR[AA] = 1).
The external and internal FB_TA assert at the same time; however, FB_TA
is not driven externally for internally-terminated bus cycles.
NOTE
The processor drives the data lines during the first clock cycle of the transfer
with the full 32-bit address. This may be ignored by standard connected
devices using non-multiplexed address and data buses. However, some
applications may find this feature beneficial.
The address and data busses are muxed between the FlexBus and SDRAM
controller. At the end of the read bus cycles the address signals are
indeterminate.
1. Select the appropriate slave device.
Assert FB_TA (external termination).
3.
1. Negate FB_TA (external termination).
1. Decode address.
1. Set FB_R/W to read.
Assert FB_CSn.
2.
1.
(auto-acknowledge/internal termination).
Sample FB_TA low and latch data.
2.
1. Start next cycle.
ColdFire device
System
2. Place address on FB_D[23:0].
2. Drive data on FB_D[31:X].
3. Assert FB_TS.
1. Negate FB_TS.
FlexBus asserts internal FB_TA
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...