NXP Semiconductors Qorivva MPC5643L Manuel utilisateur

Freescale Semiconductor

Application Note

Document Number: AN4034

Rev. 0, 03/2011

Contents

1 Scope

This paper is a brief tutorial and description on how to

select and run the MPC5643L in decoupled parallel

mode (DPM).

2 Reference material

Freescale document MPC5643LRM, MPC5643L

Microcontroller Reference Manual, Rev. 7, October

2010.

3 Overview

The paper reviews the dual core modes of the

MPC5643L, but focuses on the operation of the

decoupled parallel mode (DP mode or DPM) on the chip

and on how to enable the DPM.

The MPC5643L operates in both lock step mode and

DPM — this paper will focus on the DPM mode.

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Reference material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

4 MPC5643L dual core architecture . . . . . . . . . . . . . . . . . . 2

4.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4.2 Sphere of replication . . . . . . . . . . . . . . . . . . . . . . . . 3

4.3 Memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

5 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5.1 Hardware setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5.2 Software setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5.3 Basic dual core flash boot program flow . . . . . . . . . 5

6 Changing between LSM and DPM . . . . . . . . . . . . . . . . . 7

6.1 Configure the flash programming utility . . . . . . . . . . 7

6.2 Dump shadow flash to s-record file . . . . . . . . . . . . . 8

6.3 Modify s-record file to change LSM/DPM configuration

6.4 Program shadow flash with updated user configura-

tion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.5 Verify new configuration . . . . . . . . . . . . . . . . . . . . . 9

7 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Qorivva MPC5643L Dual

Processor Mode

by: Mark Ruthenbeck

Applications Engineering

Microcontroller Solutions Group

MPC5643L dual core architecture

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 2

4 MPC5643L dual core architecture

The MPC5643L, a SafeAssure solution, is a symmetrical dual core device based on Power Architecture™.

This device can run in one of two modes, lock step and decoupled parallel (DP) modes. The lock step mode

is for safety critical systems that require redundancy. The DP mode is for additional performance. The

increased performances possible in DP mode can be estimated in first approximation as about 1.6 the

performance of the LS mode at the same frequency.

In the DP mode, each CPU core and each connected channel run independently from the other one, and

redundancy checkers (RCCU) are disabled.

As you can see in the block diagram below, the core power architecture and core peripherals (DMA

controller, interrupt controller, crossbar bus system, memory protection unit, flash and RAM controllers,

peripheral bus bridge, system timers, and the watchdog timer) are replicated. This is referred to as the

sphere of replication.

This replication is one of the features that enables this chip to be used in a safety environment. In a dual

core mode, this replication adds a bit of additional programming for full operation.

MPC5643L dual core architecture

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 3

4.1 Block diagram

4.2 Sphere of replication

The chip has two sets of peripherals around the core Power Architecture. With two sets of peripherals, the

software will need to initialize both sets of peripherals. This adds to the amount of code, but not necessarily

to the complexity of the code.

4.3 Memory map

If the system is in lock step mode, the sphere of replication peripherals have the identical memory map.

However, if the system is in dual processor mode, these same peripherals have unique addresses. On

core(0) the SoR peripherals remain at the LSM addresses, and the core(1) SoR peripherals are now visible

at a different set of addresses.

SRAM

PMU

SWT

ECSM

STM

INTC

DMA

Crossbar Switch

VLE

MMU

I-CACHE

SPE

e200z4

VLE

MMU

I-CACHE

SPE

e200z4

Memory Protection Unit

Crossbar Switch

Memory Protection Unit

AIPS Bridge

JTAG

Nexus

JTAG

Nexus

FlexRay

AIPS Bridge

TSENS T-Sens

ECC bits

Flash memory

ECC bits + logic

SIUL

WakeUp

ADC

XOSC

BAM

SSCM

Secondary PLL

FMPLL

IRCOSC

CMU

CTU

PIT

FCCU

FlexPWM

eTimer

FlexCAN

LINFlex

DSPI

DSPI CRC

CMU

SEMA4

PMU

SWT

ECSM

STM

INTC

DMA

SEMA4

SWG

ECC logic for SRAM ECC logic for SRAM

Startup

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 4

If in DP mode, the SRAM location is modified from lock step (LS) mode. In LS mode, there is 128 KB of

contiguous SRAM beginning at location 0x4000_0000. In DP mode, the memory is split into two 64 KB

areas, 0x4000_0000 to 0x4000_FFFF and 0x5000_0000 to 0x5000_FFFF.

All the peripherals that are not included in the SoR maintain their memory-mapped addresses. There is no

change of the addresses for the non-SoR peripherals.

5Startup

5.1 Hardware setup

The decision of which mode the chip runs (LSM and DPM) is determined by a user bit, LSM_DPM, in the

shadow sector of the flash. If this bit is 0, then the unit starts up in DP mode.

The shadow flash sector is located at 0x00F0_0000. The user configuration is located at offset 0x3E10.

This is also readable at flash register BIU4 (Flash_regs_base + 0x2C).

Refer to Section 6, “Changing between LSM and DPM” for detailed instructions on how to program the

shadow flash to switch between LSM and DPM.

5.2 Software setup

During the boot sequence, this dual core architecture is set up with one core being the master and the other

core designated as slave. That is to say, the primary core, Core(0), is run from reset and executes code,

which then sets up and releases reset to Core(1). At that time, the system then begins operating in dual

processor mode.

The System Status and Configuration Module (SSCM) is the control module for making the second core

operational. The registers of interest are:

• DPM Boot Register: Base + 0x0018

• Boot Key Register: Base + 0x001C

0123456789101112131415

SWT XOSC LSM_

DPM

STCU Reserved

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Reserved

Figure 1. Shadow Flash — User Area

Startup

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 5

The reset vector is written into the DPM Boot Register[0:29]. Also, bit 30 is set to 1 to indicate that the

second core will be executing in VLE mode. If bit 30 is 0, then the core will operate in BookE mode. Bit

31 is don’t care.

Now that the boot vector is set up, to release reset of Core(1), two consecutive writes must be done to the

Boot Key Register (DPMKEY). The first write is 0x5AF0, the second is 0xA50F. When the second write

is complete, core(1) jumps to its reset vector.

5.3 Basic dual core flash boot program flow

For dual-core booting, the key concept to understand is that dual-core boot is nothing more than a typical

single-core boot, except that it starts another single-core boot. The initialization of interrupts, stack, etc.,

needs to be done on each core. So, it’s a single-core boot performed twice.

One point to remember is that an NMI is generated to both cores and this interrupt must be serviced

properly before the system runs both cores.

The diagram below shows a simplified boot process.

Address: Base + 0x0018 Access: Read/Write

0123456789101112131415

RP2BOOT

RESET: 0000000000000000

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

RP2BOOT

DVLE

RESET: 0000000000000000

= Writes have no effect on this bit

Figure 2. DPM Boot (DPMBOOT) Register

Startup

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 6

LSM_DPM=0 Boot in Lock Step

Mode

Core(0) MMU setup, other initialization

including NMI Vector, then branch to main().

Main() runs on Core(0), setting up the start

address for core(1) Place Reset Vector for

Core(1) in register P2BOOT.

Release Reset for Core(1) by writing

DPMKEY.

Core(1) runs MMU setup,other initialization

including NMI vector,

Power On Reset

Core(0) is now operational.

Core(1) changes the device mode from

DRUN to RUN0

FCCU Triggers NMI for both cores

Both cores manage their own NMI

Branch to Main()

Core(1) now operational

Core(1)

Core(0)

Changing between LSM and DPM

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 7

At power-on reset (POR), Core(0) begins operation while Core(1) remains held in reset. At this time,

Core(0) must initialize its set of peripherals, set up its environment (including the NMI routine), then

branch to main. At this point, Core(0) is essentially fully operational. Now Core(0) provides the reset

vector and writes the DMPKEY, thus releasing Core(1) from reset.

Core(1) begins its execution. The first thing that it must do is initialize its set of peripherals and set up its

environment, including its NMI routine. Core(1) then moves the chip from DRUN mode to RUN0 mode.

The system generates an NMI to both cores when the chip moves from DRUN to RUN0. Each core must

service its own NMI routines. Upon return from the NMI, both cores are now fully functional and

operating independently.

It is important for the NMI routines to be included, because the NMI interrupt is triggered when the system

moves to RUN mode.

6 Changing between LSM and DPM

As discussed in Section 5.1, “Hardware setup,” bit 9 at address 0x00F0_3E10 in the shadow flash

determines whether the cores operate in LS or DP mode. This section provides instructions on how to

program the shadow flash on the MPC5643L so that it can switch between LSM and DPM.

The following tools are required to perform the shadow flash programming:

• P&E ICDPPCNEXUS debugger for MPC55xx/56xx v1.23.3.2 or newer

• USB Multilink

6.1 Configure the flash programming utility

1. In the P&E tools installation folder, run the flash programming utility

...\pemicro\cw_progppcnexus.exe.

2. Ensure the MPC5643L is powered on and the USB Multilink is connected between the EVB and

the PC.

3. Select the Connect (Reset) to connect to the MPC5643L as shown in Figure 3.

Changing between LSM and DPM

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 8

Figure 3. Connecting to MPC5643L

4. Specify the programming algorithm to use. In this case, select the file from the P&E tools

installation folder

...\pemicro\algorithms\shadow\Freescale_MPC5643L_1x32x4k_Shadow_Blk_Freescale_C9

0FL2_Driver_031.PCP to enable program and erase operations on the shadow flash.

6.2 Dump shadow flash to s-record file

After the programming tool has been configured for the MPC5643L shadow flash, the existing contents of

the shadow flash should be dumped to an s-record file. The file will be used to change the configuration.

1. From the menu bar, select Upload Upload Module.

2. Specify a name for the s-record .s19 file.

6.3 Modify s-record file to change LSM/DPM configuration

The s-record file can now be edited to modify the LSM/DPM configuration. The s-record file format

S2xxyyyyyyzzzzcs is as follows:

•S2

Single-character start code S followed by a single-character record type. S2 indicates the line is a

data sequence with 3 bytes of address.

•xx

Two hexadecimal digits indicating the byte count in hexadecimal (address + data + checksum).

• yyyyyy

Six hexadecimal digits to indicate the three bytes of address that specify the memory location of

the first data byte

•zzzz

Zero to sixty-four pairs of hexadecimal characters specifying the data bytes

•cs

Two hex digits indicating the checksum, which is calculated by taking the sum of the all the bytes

Changing between LSM and DPM

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 9

from the byte count up to the last data byte, inclusive, modulo 256. This value is subtracted from

255 to obtain the checksum.

Example 1 shows an example s-record line at address 0x00FF_FE10. Note that this location is mirrored

with 0x00F0_3E10 which contains the user configuration discussed in Section 5.1, “Hardware setup.” The

s-record line has a byte count of 0x14, which includes a 3-byte address, 16-byte data section, and a 1-byte

checksum. The 32-bit user configuration contains 0xFFFFFFFF, which indicates bit 9 is set for LSM.

Example 1. Original S-record Line

S214FFFE10FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEE

In order to change the mode configuration to DPM, the s-record must be modified as shown in Example

2. Two changes are required: clear the LSM/DPM bit in the user configuration and recalculate the

checksum. To change to DPM, bit 9 of the user configuration is cleared so the new value is 0xFFBFFFFF.

This change requires the checksum to be recalculated as follows:

0xFF - [(0x14 + 0xFF + 0xFE + 0x10 + 0xFF + 0xBF + 0xFF + 0xFF + 0xFF + 0xFF + 0xFF + 0xFF +

0xFF + 0xFF + 0xFF + 0xFF+ 0xFF + 0xFF + 0xFF + 0xFF) mod 256] = 0x2E

Example 2. Modified S-record Line for DPM

S214FFFE10FFBFFFFFFFFFFFFFFFFFFFFFFFFFFFFF2E

The updated s-record file can now be used to program the shadow flash for DPM operation.

6.4 Program shadow flash with updated user configuration

Once the s-record file is updated, the MPC5643L shadow flash can be programmed with the new

configuration.

1. From the menu bar, select Program Erase Module.

2. From the menu bar, select File Specify Object File button and specify the name of the updated

s-record file.

3. From the menu bar, select Program Program Module button to download the s-record into the

shadow flash.

4. From the menu bar, select Verify Verify Module button to check the programming operation.

6.5 Verify new configuration

To verify the updated configuration:

1. Power-cycle the EVB to reset the MPC5643L in the new configuration.

2. Launch the P&E debugger from ...\pemicro\cw_icdppcnexus.exe and connect to the MPC5643L.

3. The status window shows the operating mode. Verify that the new mode is detected as shown in

Figure 4.

Summary

Qorivva MPC5643L Dual Processor Mode, Rev. 0

Freescale Semiconductor 10

Figure 4. MPC5643L DPM detected

7Summary

Dual-core booting is nothing more than a typical single core boot with additional code that prepares the

second core for operation and releases it from reset. At that point the second core requires the same kind

of initialization code as used on the first core.

So the end result is really a single core with peripherals times two. There is no additional complexity of

code, only additional code.

8 Revision history

Table 1. Changes made April 20121

1No substantive changes were made to the content of this document; therefore the revision number was not

incremented.

Section Description

Front page Add SafeAssure branding.

4 Add Qorivva branding.

Back page Apply new back page format.

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