M5253DEMO【PDF 6/14 页】DEMO BOARD FOR MCF5253

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Hardware Submodules

3.5

SDRAM Interface

The M5253 demo board provides 16 MB of on-board SDRAM, which is located at 0x0. The on-board

terminations are provided. The software should take notice of the timing configuration of this device for

the SDRAM controller module.

SDRAM address

0x0000_0000 ~ 0x00FF_FFFF

The SDRAM timing characters are listed below:

tRCD > 20 ns

CASL = 2 CLK

45 ns < tRAS < 100 ns

tRP > 20 ns

tRWL, RDL = 1 CLK (less than 100 MHz speed)

Here is the initialization code example for the SDRAM controller:

…

; set up 5253 cpu settings

; initialize memory settings SDRAM base Address 0x0000_0000

writemem.w 0x10000100 0x8209 ;SDRAM0 DCR0A

writemem.l 0x10000108 0x00002320 ;SDRAM0 DACR0A

writemem.l 0x1000010C 0x00FC0001 ;SDRAM0 DMR0A

writemem.l 0x10000108 0x00002328 ;SDRAM0 DACR0B

writemem.l 0x00000000 0x00000000 ;SDRAM0 MEMWR0

writemem.l 0x10000108 0x0000A320 ;SDRAM0 DACR0C

writemem.l 0x10000108 0x0000A360 ;SDRAM0 DACR0D

writemem.l 0x00000800 0x00000800 ;SDRAM0 MODE0…

3.6

BDM Interfaces — Processor

The M5253 demo board provides an on-board BDM (background debug mode) module and a connector

(26-pin header) to give the final user the ability to utilize the BDM features of the MCF5253 processor.

With the on-board BDM, the customer can use a USB A-to-B cable for debugging and downloading the

software. The 26-pin header is not populated on the board by default, the customer can populate it on the

J14. To enable the header, the customer also needs to populate four 0 ? resistors on R4 to R7.

3.7

USB 2.0 OTG

The MCF5253 processor contains a USB high-speed OTG module. This module is USB 2.0 compliant. It

supports both the host and the device modes, and provides an on-chip high-speed/full-speed/low-speed

transceiver. One mini-AB receptacle (USB 2.0 OTG) is provided on the Jamaica board. The board also

provides an external power distribution switch (MIC2026) to provide the VBUS when necessary. The USB

module uses a 24 MHz crystal for module clock.

M5253 Demo Board User Manual, Rev. 0

6

Freescale Semiconductor

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