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SDRAM Controller (SDRAMC)
18-10
Freescale Semiconductor
For 32-bit data bus configuration:
•
If all devices’ row address width is 12 bits, the column address can be
≥
8 bits.
•
If all devices’ row address width is 13 bits, the column address can be
≥
8 bits.
•
If all devices’ column address width is 8 bits, the row address can be
≥
11 bits.
•
The maximum row bits plus column bits equals 24.
•
x8 and x16 data width memory devices can be mixed (but not in the same space).
•
x32 data width memory devices cannot be mixed with any other width.
For 16-bit data bus configuration:
•
If all devices’ row address width is 12 bits, the column address can be
≥
9 bits.
•
If all devices’ row address width is 13 bits, the column address can be
≥
9 bits.
•
If all devices’ column address width is 9 bits, the row address can be
≥
11 bits.
•
The maximum row bits plus column bits equals 25.
•
x16 data width memory devices cannot be mixed with any other width.
18.3.2
SDRAM SDR Connections
shows a block diagram using 32-bit wide SDR SDRAM (such as Micron MT48LC4M32B2)
and flash (such as Spansion AM29LV160D). SDR design requires special timing consideration for the
SD_DQS[3: ] signals. For reads from DDR SDRAMs, the memory drives the DQS pins so that the data
lines and DQS signals have concurrent edges. The SDRAMC is designed to latch data 1/4 clock after the
SD_DQS[3: ] edge. For DDR SDRAM, this ensures that the latch time is in the middle of the data valid
window.
The SDRAMC also uses the SD_DQS[3: ] signals to determine when read data can be latched for SDR
SDRAM; however, SDR memories do not provide DQS outputs. Instead the SDRAMC provides a
SD_SDRDQS output routed back into the controller as SD_DQS[3: ]. The SD_SDRDQS signal should
be routed such that the valid data from the SDRAM reaches the controller at the same time or before the
SD_SDRDQS reaches the SD_DQS[3: ] inputs.
When routing SD_SDRDQS the outbound trace length should be matched to the SD_CLK trace length.
This aligns SD_SDRDQS to the SD_CLK as if the memory had generated the DQS pulse. The inbound
trace should be routed along the data path, which should synchronize the SD_DQS so that the data is
latched in the middle of the data valid window.
2
2
2
2
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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...