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Discussion Groups | AT91SAM ARM | TCM vs. internal SRAM
For users of the Atmel AT91SAM7 and AT91SAM9 ARM CPU chips. Atmel has taken a new direction by combining on chip flash and ram with the ARM CPU on a single die. This provides low cost devices for small systems using the ARM CPU. This group is to exchange information to help users get started and learn how to use the devices.
TCM vs. internal SRAM - "ICLI, Bekir (EXT)" - Mar 18 9:02:00 2008
Hi all,
I was curious if I could increase my performance using TCMs.
Currently, I am loading my interrupt handler code to internal fast SRAM.
Would it make sense if use part of this memory as I-TCM and load the irq
handlers to this location?
Regards,
Bekir
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
I was curious if I could increase my performance using TCMs.
Currently, I am loading my interrupt handler code to internal fast SRAM.
Would it make sense if use part of this memory as I-TCM and load the irq
handlers to this location?
Regards,
Bekir
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: TCM vs. internal SRAM - 42Bastian - Mar 18 10:21:48 2008
ICLI, Bekir (EXT) schrieb:
> I was curious if I could increase my performance using TCMs.
> Currently, I am loading my interrupt handler code to internal fast SRAM.
> Would it make sense if use part of this memory as I-TCM and load the irq
> handlers to this location?
Yes. TCM runs at CPU speed, SRAM at AHB speed (1/2 of CPU speed).
--
42Bastian
Note: SPAM-only account, direct mail to bs42@...
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> I was curious if I could increase my performance using TCMs.
> Currently, I am loading my interrupt handler code to internal fast SRAM.
> Would it make sense if use part of this memory as I-TCM and load the irq
> handlers to this location?
Yes. TCM runs at CPU speed, SRAM at AHB speed (1/2 of CPU speed).
--
42Bastian
Note: SPAM-only account, direct mail to bs42@...
========================================================================
Groups related to AT91SAM
========================================================================
lpc2000 (418 common members)
http://groups.yahoo.com/group/lpc2000?v=1&t=ipt&ch=email&pub=groups&slk=aftr0&sec=recg
Microprocessors/Microcontrollers: The NXP (formerly Philips) LPC2000 family of ARM M...
msp430 (131 common members)
http://groups.yahoo.com/group/msp430?v=1&t=ipt&ch=email&pub=groups&slk=aftr1&sec=recg
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AW: TCM vs. internal SRAM - "ICLI, Bekir (EXT)" - Mar 18 11:46:17 2008
Hi Bastian,
=20
I guess I am missing something, while enabling the I-TCM.
I am doing the following:
#define ITCM_BASE 0x100000 /* In memory map, I-TCM is located=
at the second MB, but I have a feeling like what I am doing here might not=
be correct */
#define ITCM_SIZE (0x5 << 2) /* 16KB */
#define ITCM_ENABLE 0x1
#define ITCM_PATTERN (ITCM_BASE | ITCM_SIZE | ITCM_ENABLE)
MRC p15, 0, r1, c9, c1, 1=20=20=20=20=20=20=20
ORR r1, r1, #ITCM_PATTERN=20
MCR p15, 0, r1, c9, c1, 1=20
And I am copying the IRQ handler code not the the internal SRAM, but to the=
second MB.
But it stops at the first interrupt.
Should I take another measure to enable TCM??
Mit freundlichem Gru=DF / Best regards
Bekir ICLI
Siemens AG
Automation and Drives, Automation and Drives, A&D SC IC RD4
Tel. : +49 (721) 595-3280
mailto:b...@siemens.com
http://www.siemens.com/automation
Siemens Aktiengesellschaft: Chairman of the Supervisory Board: Gerhard Crom=
me
Managing Board: Peter Loescher, Chairman, President and Chief Executive Off=
icer;=20
Wolfgang Dehen, Heinrich Hiesinger, Joe Kaeser, Erich R. Reinhardt, Hermann=
Requardt,=20
Siegfried Russwurm, Peter Y. Solmssen
Registered offices: Berlin and Munich;=20
Commercial registries: Berlin Charlottenburg, HRB 12300, Munich, HRB 6684
WEEE-Reg.-No. DE 23691322
-----Urspr=FCngliche Nachricht-----
Von: A...@yahoogroups.com [mailto:A...@yahoogroups.com] Im Auftrag vo=
n 42Bastian
Gesendet: Dienstag, 18. M=E4rz 2008 15:16
An: A...@yahoogroups.com
Betreff: Re: [AT91SAM] TCM vs. internal SRAM
ICLI, Bekir (EXT) schrieb:
> I was curious if I could increase my performance using TCMs.
> Currently, I am loading my interrupt handler code to internal fast SRAM.
> Would it make sense if use part of this memory as I-TCM and load the irq
> handlers to this location?
Yes. TCM runs at CPU speed, SRAM at AHB speed (1/2 of CPU speed).
--=20
42Bastian
Note: SPAM-only account, direct mail to bs42@...
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Computers & Internet/Hardware: Welcome to the MSP430 User's Group! The purp=
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Internet/Internet Appliances: Open-membership mailing list for embedded sys=
tem d...
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
=20
I guess I am missing something, while enabling the I-TCM.
I am doing the following:
#define ITCM_BASE 0x100000 /* In memory map, I-TCM is located=
at the second MB, but I have a feeling like what I am doing here might not=
be correct */
#define ITCM_SIZE (0x5 << 2) /* 16KB */
#define ITCM_ENABLE 0x1
#define ITCM_PATTERN (ITCM_BASE | ITCM_SIZE | ITCM_ENABLE)
MRC p15, 0, r1, c9, c1, 1=20=20=20=20=20=20=20
ORR r1, r1, #ITCM_PATTERN=20
MCR p15, 0, r1, c9, c1, 1=20
And I am copying the IRQ handler code not the the internal SRAM, but to the=
second MB.
But it stops at the first interrupt.
Should I take another measure to enable TCM??
Mit freundlichem Gru=DF / Best regards
Bekir ICLI
Siemens AG
Automation and Drives, Automation and Drives, A&D SC IC RD4
Tel. : +49 (721) 595-3280
mailto:b...@siemens.com
http://www.siemens.com/automation
Siemens Aktiengesellschaft: Chairman of the Supervisory Board: Gerhard Crom=
me
Managing Board: Peter Loescher, Chairman, President and Chief Executive Off=
icer;=20
Wolfgang Dehen, Heinrich Hiesinger, Joe Kaeser, Erich R. Reinhardt, Hermann=
Requardt,=20
Siegfried Russwurm, Peter Y. Solmssen
Registered offices: Berlin and Munich;=20
Commercial registries: Berlin Charlottenburg, HRB 12300, Munich, HRB 6684
WEEE-Reg.-No. DE 23691322
-----Urspr=FCngliche Nachricht-----
Von: A...@yahoogroups.com [mailto:A...@yahoogroups.com] Im Auftrag vo=
n 42Bastian
Gesendet: Dienstag, 18. M=E4rz 2008 15:16
An: A...@yahoogroups.com
Betreff: Re: [AT91SAM] TCM vs. internal SRAM
ICLI, Bekir (EXT) schrieb:
> I was curious if I could increase my performance using TCMs.
> Currently, I am loading my interrupt handler code to internal fast SRAM.
> Would it make sense if use part of this memory as I-TCM and load the irq
> handlers to this location?
Yes. TCM runs at CPU speed, SRAM at AHB speed (1/2 of CPU speed).
--=20
42Bastian
Note: SPAM-only account, direct mail to bs42@...
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Microprocessors/Microcontrollers: The NXP (formerly Philips) LPC2000 family=
of ARM M...
msp430 (131 common members)=20=20=20=20=20=20=20=20=20=20=20
http://groups.yahoo.com/group/msp430?v=3D1&t=3Dipt&ch=3Demail&pub=3Dgroups&=
slk=3Daftr1&sec=3Drecg=20=20
Computers & Internet/Hardware: Welcome to the MSP430 User's Group! The purp=
ose of...
avrclub (118 common members)=20=20=20=20=20=20=20=20=20=20=20
http://groups.yahoo.com/group/avrclub?v=3D1&t=3Dipt&ch=3Demail&pub=3Dgroups=
&slk=3Daftr2&sec=3Drecg=20=20
Microprocessors/Microcontrollers: Atmel AVR Microcontroller discussion grou=
p!
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http://groups.yahoo.com/group/AVR-Chat?v=3D1&t=3Dipt&ch=3Demail&pub=3Dgroup=
s&slk=3Daftr3&sec=3Drecg=20=20
Microprocessors/Microcontrollers: A place for Atmel AVR Microcontroller use=
rs to sha...
e-embedded (82 common members)=20=20=20=20=20=20=20=20=20=20=20
http://groups.yahoo.com/group/e-embedded?v=3D1&t=3Dipt&ch=3Demail&pub=3Dgro=
ups&slk=3Daftr4&sec=3Drecg=20=20
Internet/Internet Appliances: Open-membership mailing list for embedded sys=
tem d...
------------------------------------
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