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What is the difference between M4 and MP series
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What is the difference between M4 and MP series
Offline
O M
over 7 years ago
Note: This was originally posted on 8th July 2013 at http://forums.arm.com
Hello
[size=2]
[/size]
[size=2]I have to port a project that was written for the ARM11 MPcore to a project that will run on M4 (actually it is freescale Kinetis K60with M4 inside it)[/size]
[size=2]I saw in the documents of the ARM11 MP that it has 2 levelTLB, seven modes of operation (FIQ, IRQ, Supervisor, Abort, System, Undefinedmode), ...[/size]
In the documentation for the M4 I don't find any of it.
May I ask if it is exist in the M4 (K60) and what is themain differences between those two processors ?
Thanks a lot
OM
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Peter Harris
over 7 years ago
Note: This was originally posted on 9th July 2013 at
http://forums.arm.com
> In the documentation for the M4 I don't find any of it.
Correct =)
> what is the main differences between those two processors ?
The ARM11 is an ARMv6 processor. It was designed as a applications processor for running full-fat operating systems such as Linux, Windows CE, etc, so comes with an MMU, caches, etc.
The Cortex-M4 is an ARMv7M processor. This has a different processor architecture designed to simplify the core (smaller, more power efficient), and make it easier to program for (fewer operating modes, only implements Thumb/Thumb2 (no "ARM" ISA), you can write most code in C with no need for assembler). As a micro-controller it is designed to be plugged directly to a bus with a local SRAM, so it has no cache or MMU, but can have an optional MPU (memory protection unit).
If you are new to the Cortex-M series I would recommend the "The Definitive Guide to the ARM Cortex-M3" book. It doesn;t cover all of the Cortex-M4 changes, but teaches all of the essentials needed for getting started on the Cortex-M - most of the content is the same for both.
HTH,
Iso
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Peter Harris
over 7 years ago
Note: This was originally posted on 9th July 2013 at
http://forums.arm.com
[color=#222222][font=Arial, Helvetica, sans-serif]> 2. I wasn't aware of Thumb2 instruction set.[/font][/color] Is the integer type is 32 bit or 16 ?
The Cortex-M family are still all 32-bit cores, so the register size etc is still 32-bits. Thumb introduces some 16-bit instructions, but they still operate on 32-bit data registers.
> If it is 32 bits, does the access to it is in one cycle or two ?
From the instruction set side of things each register load is a single instruction. Bus cycles depend on the implementation. It is quite common for external ROM or Flash to only have an 8 or 16-bit data bus to reduce pin-out on some MCU designs, so 32-bit accesses take multiple cycles, but this is all managed in hardware. Internal memory inside the MCU is normally using a 32-bit data path, but not always.
ARM only design the CPU core, so for full device memory system specifications you will need to check with a specific manufacturer.
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Offline
O M
over 7 years ago
Note: This was originally posted on 10th July 2013 at
http://forums.arm.com
Thanks a lot
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Offline
O M
over 7 years ago
Note: This was originally posted on 9th July 2013 at
http://forums.arm.com
Regarding questoin 1, I found PDF of the whole book. Thanks a lot.
Can someone help regarding the second question ?
(the one with the thumb2, the size of data bus, and atomic access to int (if it is 32 bits wide)
Thanks
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O M
over 7 years ago
Note: This was originally posted on 9th July 2013 at
http://forums.arm.com
Hi
Thanks a lot for an excellent detailed answer.
Yes, I am new to the M3 family (and to ARM in general)
I read the two chapters here
http://www.arm.com/support/resources/arm-books/the-definitive-guide-to-the-arm-cortex-m3.php
1. Is it possible to download the whole book somewhere ? (I mean, free of charge)
2. I wasn't aware of Thumb2 instruction set.
Is the integer type is 32 bit or 16 ?
If it is 32 bits, does the access to it is in one cycle or two ?
(I didn't find what is the size of the data bus)
Thanks a lot and have a great day
OM
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