
FlexBus
Freescale Semiconductor
17-15
Figure 17-8. Basic Read-Bus Cycle
17.4.5.2
Basic Write Bus Cycle
During a write cycle, the device sends data to memory or to a peripheral device.
shows the
write cycle flowchart.
Figure 17-9. Write-Cycle Flowchart
FB_CLK
FB_R/W
S0
S1
S2
DATA
FB_TS
FB_A[23:0]
ADDR[23:0]
FB_D[31:X]
ADDR[31:X]
FB_CSn, FB_OE,
FB_BE/BWEn
FB_TA
S0
S3
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 write.
Assert FB_CSn.
2.
1.
(auto acknowledge/internal termination).
Sample FB_TA low.
2.
1. Start next cycle.
ColdFire device
System
Drive data.
3.
2. Place address on FB_D[23:0].
2. Latch 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...