Difference between revisions of "Main Processor"

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== CXD5315GG ==
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== Main SoC ==
The main SoC is labeled <code>CXD5315GG</code>. The design is a stacked SoC with the SDRAM found in the same chip as the processor cores. Toshiba details their "[http://www.toshiba-components.com/ASIC/SiP.html Stacked Chip SOC]" on their site.
 
  
More information can be found at [http://www.chipworks.com/en/technical-competitive-analysis/resources/blog/sonys-ps-vita-uses-chip-on-chip-sip-3d-but-not-3d/ Chipworks].
+
See [[Kermit]].
  
[[File:T9ML7MBG-S.png|thumb|From FCC application 712137]]
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== Cortex A9 MPcore ==
According to the internal photos found in the [https://apps.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=712137&fcc_id=AK8PCH1101A FCC filings], it appears that an earlier version of the chip is labeled <code>T9ML7MBG-S</code>. This does not appear to be a standard model and is likely custom designed in partnership with Sony Computer Entertainment Japan. It is possible that Sony used [http://www.toshiba-components.com/ASIC/index.html this service] from Toshiba in their design process which is why the prototype demonstrated in the FCC filing shows a Toshiba chip..
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 +
The custom SoC includes the ARM [http://www.arm.com/products/processors/cortex-a/cortex-a9.php Cortex-A9 MPCore] as its CPU, mounting four little-endian ARM Cortex-A9 processor cores, which is common in modern high performance embedded devices like cell phones and tablets. The PSVita cores have a MIDR value of <code>0x412FC09A</code>, meaning it is Cortex-A9 r2p10. Indeed there are usage of undocumented CP15 registers.
 +
 
 +
<source lang="C">
 +
DACR
 +
  p15, #0, r0, c3, c0, #1 @ Write-Only. Used by ScePower.
 +
  p15, #0, r0, c3, c0, #2 @ Used by ScePower.
 +
</source>
 +
 
 +
Each core includes the following features:
 +
* L1 Instruction Cache of 32 KiB and Data Cache of 32 KiB 
 +
* Media Processing Engine (MPE) that can execute Advanced SIMD instructions (NEONv1) and Vector Floating-Point v3 instructions (VFPv3)
  
== Cortex A9 MPcore ==
+
In addition, there is a L2 cache of 2 MiB shared by all cores, while precisely speaking, it's external to the ARM processor core.
The actual application processor cores are [http://www.arm.com/products/processors/cortex-a/cortex-a9.php Cortex A9], which is common in modern high performance embedded devices like cell phones and tablets. The [http://infocenter.arm.com/help/topic/com.arm.doc.ddi0388i/index.html Technical Reference Manual] gives a good overview of the specific processor features and is a good reference for what ARMv7 implementation specific features are enabled. The Vita cores have a MIDR value of <code>0x412FC09A</code>, meaning it is Cortex A9 r2p10. Indeed there are usage of undocumented CP15 registers.
+
 
 +
=== Documentation ===
 +
 
 +
A lot of useful information is available about ARM (Advanced RISC Machines) on the internet including ARM Ltd. official site.
 +
 
 +
* Refer to the following document for the instruction set, memory model and programmers' model: ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition.
 +
 
 +
* The [http://infocenter.arm.com/help/topic/com.arm.doc.ddi0388i/index.html ARM Cortex-A9 Technical Reference Manual] gives a good overview of the specific processor features and is a good reference for what ARMv7 implementation specific features are enabled.
 +
 
 +
* Another manual that's important is the [http://infocenter.arm.com/help/topic/com.arm.doc.ddi0407i/index.html ARM Cortex-A9 MPCore Technical Reference Manual] which is specific to the multi-core system the Vita uses. The main information of use are descriptors for the private memory region defined with the <code>PERIPHBASE</code> signal. This is mapped to [[Physical Memory|physical address]] <code>0x1A000000</code>.
 +
 
 +
* Cortex-A9 Technical Reference Manual
 +
(corresponding to the chip revision supposed to be included in DevKit):
 +
 
 +
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0388f/DDI0388F_cortex_a9_r2p2_trm.pdf
 +
 
 +
* Cortex-A9 NEON Media Processing Engine Technical Reference Manual
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(NEON: Advanced SIMD instructions)
 +
 
 +
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0409f/DDI0409F_cortex_a9_neon_mpe_r2p2_trm.pdf
 +
 
 +
* Cortex-A9 NEON MPE > VFPv3 architecture hardware support
 +
 
 +
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0409f/CHDEEJDB.html
 +
 
 +
(The above reference destination has been confirmed as of June 26, 2014. Note that pages may have been subsequently moved or its contents modified.)
  
Another manual that's important is the [http://infocenter.arm.com/help/topic/com.arm.doc.ddi0407i/index.html MPCore Technical Reference Manual] which is specific to the multi-core system the Vita uses. The main information of use are descriptors for the private memory region defined with the <code>PERIPHBASE</code> signal. This is mapped to [[Physical Memory|physical address]] <code>0x1A000000</code>.
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=== Identification registers ===
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{| class='wikitable'
 +
! Register name !! Value
 +
|-
 +
| AIDR || 0x00000000
 +
|-
 +
| CCSIDR || 0x701FE019
 +
|-
 +
| CLIDR || 0x09200003
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|-
 +
| CTR || 0x83338003
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|-
 +
| ID_AFR0 || 0x00000000
 +
|-
 +
| ID_DFR0 || 0x00010444
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|-
 +
| ID_ISAR0 || 0x00101111
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|-
 +
| ID_ISAR1 || 0x13112111
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|-
 +
| ID_ISAR2 || 0x21232041
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|-
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| ID_ISAR3 || 0x11112131
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|-
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| ID_ISAR4 || 0x00011142
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|-
 +
| ID_ISAR5 || 0x00000000
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|-
 +
| ID_MMFR0 || 0x00100103
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|-
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| ID_MMFR1 || 0x20000000
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|-
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| ID_MMFR2 || 0x01230000
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|-
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| ID_MMFR3 || 0x00102111
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|-
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| ID_PFR0 || 0x00001231
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|-
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| ID_PFR1 || 0x00000011
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|-
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| MIDR || 0x412FC09A
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|-
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| MPIDR || 0x80000003
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|-
 +
| REVIDR || 0x412FC09A
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|-
 +
| TCMTR || 0x00000000
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|-
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| TLBTR || 0x00000402
 +
|}
  
 
== Interrupt Controller ==
 
== Interrupt Controller ==
 
As part of the Cortex A9 MPcore, the Vita also implements the [http://www.systems.ethz.ch/sites/default/files/file/aos2012/ReferenceMaterial/InterruptHandling/GIC_architecture_spec_v1_0.pdf Generic Interrupt Controller Architecture]. More information on interrupts can be found [[Interrupts|here]].
 
As part of the Cortex A9 MPcore, the Vita also implements the [http://www.systems.ethz.ch/sites/default/files/file/aos2012/ReferenceMaterial/InterruptHandling/GIC_architecture_spec_v1_0.pdf Generic Interrupt Controller Architecture]. More information on interrupts can be found [[Interrupts|here]].
  
== PL310 L2 Cache ==
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== L2 Cache ==
The Vita uses the [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0246a/index.html PL310] L2 cache is is [[Physical Memory|mapped]] to <code>0x1A002000</code>.
+
 
 +
PSVita uses the [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0246f/index.html PL310 r3p1-50rel0] L2 cache (Cache ID Register = 0x410000C7) that is [[Physical Memory|mapped]] to paddr <code>0x1A002000</code>.
 +
 
 +
=== RO registers ===
 +
 
 +
{| class='wikitable'
 +
! Register name !! Value
 +
|-
 +
| Cache ID Register || 0x410000c7
 +
|-
 +
| Cache Type Register || 0x1e440440
 +
|}
 +
 
  
 
[[Category:Devices]]
 
[[Category:Devices]]

Latest revision as of 21:12, 5 January 2022

Main SoC

See Kermit.

Cortex A9 MPcore

The custom SoC includes the ARM Cortex-A9 MPCore as its CPU, mounting four little-endian ARM Cortex-A9 processor cores, which is common in modern high performance embedded devices like cell phones and tablets. The PSVita cores have a MIDR value of 0x412FC09A, meaning it is Cortex-A9 r2p10. Indeed there are usage of undocumented CP15 registers.

DACR
  p15, #0, r0, c3, c0, #1 @ Write-Only. Used by ScePower.
  p15, #0, r0, c3, c0, #2 @ Used by ScePower.

Each core includes the following features:

  • L1 Instruction Cache of 32 KiB and Data Cache of 32 KiB
  • Media Processing Engine (MPE) that can execute Advanced SIMD instructions (NEONv1) and Vector Floating-Point v3 instructions (VFPv3)

In addition, there is a L2 cache of 2 MiB shared by all cores, while precisely speaking, it's external to the ARM processor core.

Documentation

A lot of useful information is available about ARM (Advanced RISC Machines) on the internet including ARM Ltd. official site.

  • Refer to the following document for the instruction set, memory model and programmers' model: ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition.
  • Cortex-A9 Technical Reference Manual

(corresponding to the chip revision supposed to be included in DevKit):

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0388f/DDI0388F_cortex_a9_r2p2_trm.pdf

  • Cortex-A9 NEON Media Processing Engine Technical Reference Manual

(NEON: Advanced SIMD instructions)

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0409f/DDI0409F_cortex_a9_neon_mpe_r2p2_trm.pdf

  • Cortex-A9 NEON MPE > VFPv3 architecture hardware support

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0409f/CHDEEJDB.html

(The above reference destination has been confirmed as of June 26, 2014. Note that pages may have been subsequently moved or its contents modified.)

Identification registers

Register name Value
AIDR 0x00000000
CCSIDR 0x701FE019
CLIDR 0x09200003
CTR 0x83338003
ID_AFR0 0x00000000
ID_DFR0 0x00010444
ID_ISAR0 0x00101111
ID_ISAR1 0x13112111
ID_ISAR2 0x21232041
ID_ISAR3 0x11112131
ID_ISAR4 0x00011142
ID_ISAR5 0x00000000
ID_MMFR0 0x00100103
ID_MMFR1 0x20000000
ID_MMFR2 0x01230000
ID_MMFR3 0x00102111
ID_PFR0 0x00001231
ID_PFR1 0x00000011
MIDR 0x412FC09A
MPIDR 0x80000003
REVIDR 0x412FC09A
TCMTR 0x00000000
TLBTR 0x00000402

Interrupt Controller

As part of the Cortex A9 MPcore, the Vita also implements the Generic Interrupt Controller Architecture. More information on interrupts can be found here.

L2 Cache

PSVita uses the PL310 r3p1-50rel0 L2 cache (Cache ID Register = 0x410000C7) that is mapped to paddr 0x1A002000.

RO registers

Register name Value
Cache ID Register 0x410000c7
Cache Type Register 0x1e440440