MPC8379E - 128Mbyte Nor flash interface

saravanakumar_s — Mon, 22 Jun 2015 09:59:42 GMT

Need to interface 128Mbyte Nor flash (64M x 16) to MPC8379E Enhanced Local Bus. Can I have reference.

Re: MPC8379E - 128Mbyte Nor flash interface

r8070z — Mon, 22 Jun 2015 17:37:48 GMT

Have a great day,

128Mbyte Nor flash (64M x 16) has 25 address inputs A[0:24], where A0 is the least significant (lsb). The MPC8379 eLBC in Non-Multiplexed mode can support only (32M x 16) because in this mode only 24 lsb of the 31-bit address of 16-bit word can be provided on the LA pins. Hence you need use Multiplexed mode i.e. to use external latch controlled by LALE outputs and latch address from LAD[6:26] pins. The latch outputs need to be connected to the 21 most significant of the NOR flash address inputs (A[24:4]):

8379->latch--NOR

LAD[6] ->LBA[6]---A24

LAD[7] ->LBA[7]---A23

…

LAD[26] ->LBA[7]---A4

The rest addr. inputs A[4:0] can be connected to the non-multiplexed LA[27:30] outputs

8379 --NOR

LA27—A3

LA28—A2

LA29—A1

LA30—A0

16 – bit data are provided on the LAD[0:15] (LAD0 is msb) so recommended connection is

8379 –NOR

LAD[0]—D15

LAD[1]—D14

…

LAD[15]—D0

Control signals connection is straightforward

LWE to the NOR WE

LOE to the NOR OE

Any one of LCSn to the NOR CE

You can get explanation how to connect NOR Flash in the app. note AN3665 “PowerQUICC Design Checklist. For PowerQUICC II Pro (MPC837x) Devices” You can download it from the Freescale page

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC8379E&fpsp=1&tab=Documentation_Tab

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MPC8379E - 128Mbyte Nor flash interface

Re: MPC8379E - 128Mbyte Nor flash interface