Hi,
i am using adsp-2191 processor in my circuit.i have some doubts regarding
memory configuration of adsp-2191.
There are two memories external aswell as
boot.both of them had been allocated same memory space from 0x01 0000 to 0xFE
FFFF.
I am not clear whether that space
1. can be partitioned among boot and extrnal spaces,or
2.it has to be used either only external memory,or only for boot memory,or
3. if the same momory space from 0x01 0000 to 0xFE FFFFhas to be used for boot
and external how to distinguish between those address locations.
please send me the reply.
---------------------------------
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need info regarding ADSP-2191memory
Started by ●July 18, 2006
Reply by ●July 19, 20062006-07-19
Hi Rakesh
The best thing to do is to carefully read the first 15-20 pages of ch7 of
the 2191 HW Reference available at
http://www.analog.com/UploadedFiles/Associated_Docs/481403281854692192hwr_re
v1_1.pdf. You should also read ch14 p12-18 to understand booting better.
This should reduce your concerns about boot memory. For me, it was easiest
to put the code on a serial EEPROM and boot from SPI.
To answer the details of your questions, the space from 0x01 0000 to 0xFE
FFFF is really external memory pages 1-254. It is all available for
external memory. Page 0 is for the 2191's internal memory and page 255
appears to be for the 2191's internal booting, but I'm not 100% sure on
this.
I just finished prototyping a 2191 system with 512 Kwords of external memory
that used external memory pages 64-71. I implemented it with two Cypress
CY62148DV30 chips. My original design used the CY7C1061AV33 which was too
fast for the DSP, so make sure your memory is not too fast for the 2191.
Best regards,
-Todd
-----Original Message-----
From: a... [mailto:a...]On Behalf Of
rakesh sharma
Sent: Monday, July 17, 2006 9:21 PM
To: a...
Subject: [adsp] need info regarding ADSP-2191memory
Hi,
i am using adsp-2191 processor in my circuit.i have some doubts regarding
memory configuration of adsp-2191.
There are two memories external aswell as
boot.both of them had been allocated same memory space from 0x01 0000 to
0xFE FFFF.
I am not clear whether that space
1. can be partitioned among boot and extrnal spaces,or
2.it has to be used either only external memory,or only for boot memory,or
3. if the same momory space from 0x01 0000 to 0xFE FFFFhas to be used for
boot and external how to distinguish between those address locations.
please send me the reply.
The best thing to do is to carefully read the first 15-20 pages of ch7 of
the 2191 HW Reference available at
http://www.analog.com/UploadedFiles/Associated_Docs/481403281854692192hwr_re
v1_1.pdf. You should also read ch14 p12-18 to understand booting better.
This should reduce your concerns about boot memory. For me, it was easiest
to put the code on a serial EEPROM and boot from SPI.
To answer the details of your questions, the space from 0x01 0000 to 0xFE
FFFF is really external memory pages 1-254. It is all available for
external memory. Page 0 is for the 2191's internal memory and page 255
appears to be for the 2191's internal booting, but I'm not 100% sure on
this.
I just finished prototyping a 2191 system with 512 Kwords of external memory
that used external memory pages 64-71. I implemented it with two Cypress
CY62148DV30 chips. My original design used the CY7C1061AV33 which was too
fast for the DSP, so make sure your memory is not too fast for the 2191.
Best regards,
-Todd
-----Original Message-----
From: a... [mailto:a...]On Behalf Of
rakesh sharma
Sent: Monday, July 17, 2006 9:21 PM
To: a...
Subject: [adsp] need info regarding ADSP-2191memory
Hi,
i am using adsp-2191 processor in my circuit.i have some doubts regarding
memory configuration of adsp-2191.
There are two memories external aswell as
boot.both of them had been allocated same memory space from 0x01 0000 to
0xFE FFFF.
I am not clear whether that space
1. can be partitioned among boot and extrnal spaces,or
2.it has to be used either only external memory,or only for boot memory,or
3. if the same momory space from 0x01 0000 to 0xFE FFFFhas to be used for
boot and external how to distinguish between those address locations.
please send me the reply.
