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==MIPS==
==IOP==


I/O processor - MIPS R3000A (PS1 main processor) used in PS2 since SCPH-10000 to SCPH-700XX. Runs at a 36.864 MHz or a 33.8688 MHz (underclocked when in compatibility mode) clock speed. It is connected to an external 2 MB EDO-RAM chip. Later got replaced by a new IOP based around a PowerPC 405 core, but with an additional MIPS core.
I/O processor - MIPS R3000A (PS1 main processor) used in PS2 since SCPH-10000 to SCPH-700XX. It is connected to an external 2 MB EDO-RAM chip. Later got replaced by PowerPC 405 and DECKARD IOP emulator.


=== Revisions ===
==DECKARD==
* 1.5 : CXD9553GB  (GH-001, GH-003)
* ??? : CXD9590GB  (MPU-4 in DTL-T10000H)
* 1.15: CXD9619GB  (GH-004 - GH-014, GH-016)
* 2.0 : CXD9660GB  (early GH-015)
* 2.1 : CXD9697GP  (late GH-015, erroneously listed as "CXD9697GB" in service manuals?)
* 2.1 : CXD9732GP  (very late GH-015, GH-017 - GH-022)
* 2.2 : CXD9783GP  (GH-023)
* 2.4 : CXD9798GP  (some GH-026 boards, some GH-029 boards)
* 2.4 : CXD9799GP  (PSX XPD-001/XPD-005, some Namco System 256, some K-chassis slim boards, some GH-026 boards, maybe J-chassis GH-029?)
* 2.4 : CXD9799AGP (some Namco System 256, some K-chassis slim boards, Namco System 147, Namco System 148)


==PowerPC==
PowerPC 405 chip that replaced IOP and [[SPEED]]. It is connected to an external 4 MB DDR-SDRAM chip. In IOP emulator mode 2MB are used as a IOP memory. In PS2 used since SCPH-750XX model. New chip require some compatibility tweaks that are done per title by xparam file found in PS2 ROM.


PowerPC 405 chip that replaced IOP and [[SPEED]] since SCPH-750XX model. It is connected to an external 4 MB DDR-SDRAM chip. The first 2Mb were reserved to be used as the RAM of the emulated IOP, the other 2Mb are used by the DECKARD emulator, however, between the emulator itself and some lookup tables found on RAM, it doesn't consume all available RAM.
On SCPH-790XX and later, the PPC-based IOP was integrated into the new main SoC together with its RAM.
If these lookup tables get relocated,  up to 966kb of free RAM can be obtained without breaking the DECKARD emulator.


Note: There is some support hardware inside the PPC IOP for the emulation. It's not purely software emulation.
Note: There is some evidence that the new IOP might still additionaly contain some kind of MIPS core.


[https://www2.informatik.hu-berlin.de/~fwinkler/psvfpga/amirix/405_um.pdf Documentation]
[https://www2.informatik.hu-berlin.de/~fwinkler/psvfpga/amirix/405_um.pdf Documentation]
[http://psx-scene.com/forums/f19/deckard-ppc-iop-discussion-157416/#post1215298 More info]
[http://psx-scene.com/forums/f19/deckard-ppc-iop-discussion-157416/#post1215298 More info]


====TLB Entries====
{| class="wikitable"
|-
! Virtual!!Physical!!Size!!Endian (Big/little)!!RWX!!Write-Through!!Cache Inhibit!!Memory Coherence!!Guarded!!User-defined storage attribute Un n=[0-3]!!Notes
|-
|0xFFE00000||0xFFE00000||0x00100000||B||RX ||1||0||0||0||-||DECKARD's BOOT ROM PPC440 BOOT ROM: 0xFFE00000 - 0xFFFFFFFF (2MB)
|-
|0xFFF00000||0xFFF00000||0x00100000||B||RX ||1||0||0||0||-||DECKARD's BOOT ROM
|-
|0x00000000||0x00200000||0x00100000||L||RW ||1||0||0||0||2||IOP RAM low 1MB mirror virtual R3000 IOP instructions use
|-
|0x00100000||0x00300000||0x00100000||L||RW ||1||0||0||0||2||IOP RAM high 1MB mirror
|-
|0x00200000||0x00200000||0x00100000|| ||  || || || || || ||IOP RAM low 1MB mirror
|-
|0x00300000||0x00300000||0x00100000|| ||  || || || || || ||IOP RAM high 1MB mirror
|-
|0x00400000||0x00200000||0x00100000|| ||  || || || || || ||IOP RAM low 1MB mirror
|-
|0x00500000||0x00300000||0x00100000|| ||  || || || || || ||IOP RAM high 1MB mirror
|-
|0x00600000||0x00200000||0x00100000|| ||  || || || || || ||IOP RAM low 1MB mirror
|-
|0x00700000||0x00300000||0x00100000|| ||  || || || || || ||IOP RAM high 1MB mirror
|-
|0xDFE00000||0x00200000||0x00100000||L||R  ||1||0||0||0||2||IOP RAM low 1MB mirror NOT:EE SIF (SBUS) IOP mem. window ? most likely:DECKARD 'supervisor' ??
|-
|0xDFF00000||0x00300000||0x00100000||L||R  ||1||0||0||0||2||IOP RAM high 1MB mirror
|-
|0x00000000||0x00000000||0x00100000||L||RW ||0||1||0||0||-||1MB Invalid these two segments are the same! one maps to 0x00200000 and the other to 0  Switcing the valid entries is done in code.
|-
|0x00100000||0x00100000||0x00100000||L||RW ||0||1||0||0||-||1MB Invalid
|-
|0x00200000||0x00000000||0x00100000||L||  || || || || || ||
|-
|0x00300000||0x00100000||0x00100000||L||  || || || || || ||
|-
|0x00400000||0x00000000||0x00100000||L||  || || || || || ||
|-
|0x00500000||0x00100000||0x00100000||L||  || || || || || ||
|-
|0x00600000||0x00000000||0x00100000||L||  || || || || || ||
|-
|0x00700000||0x00100000||0x00100000||L||  || || || || || ||
|-
|0xDFE00000||0x00000000||0x00100000||L||R  ||0||1||0||0||-||1MB Invalid
|-
|0xDFF00000||0x00100000||0x00100000||L||R  ||0||1||0||0||-||1MB Invalid
|-
|0x00A00000||0x00A00000||0x00100000||B||RWX||1||0||0||0||-||1MB DECKARD file RAM loading segment (code & data)||
|-
|0x00BE0000||0x00B60000||0x00001000||B||RW ||0||0||0||0||-||4kB Some variables and flags...?
|-
|0x00BFF000||0x00B7F000||0x00001000||B||RW ||0||0||0||0||-||4kB PPC stack?
|-
|0x00BDF000||0x00B7F000||0x00001000||B||R  ||0||0||0||0||-||4kB
|-
|0x00B40000||0x00B40000||0x00000400||L||RW ||0||1||0||0||-||1kB
|-
|0x00B40400||0x00B40400||0x00000400||L||RW ||0||1||0||0||-||1kB
|-
|0x00B40C00||0x00FFFC00||0x00000400||L||RW ||0||1||0||0||-||1kB The physical addr. of this is in the last 1kB of the 16MB of IOP RAM.
|-                                                             
|0x01000000||0x40000000||0x00000400||B||RW ||0||1||0||1||-||1kB PPC devices: PPC UART is here
|-                                                             
|0x40000000||0x00200000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM low 1MB mirror
|-                                                             
|0x40100000||0x00300000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM high 1MB mirror
|-                                                             
|0x40200000||0x00200000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM low 1MB mirror
|-                                                             
|0x40300000||0x00300000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM high 1MB mirror
|-                                                             
|0x40400000||0x00200000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM low 1MB mirror
|-                                                             
|0x40500000||0x00300000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM high 1MB mirror
|-                                                             
|0x40600000||0x00200000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM low 1MB mirror
|-                                                             
|0x40700000||0x00300000||0x00100000||L||RW ||1||0||0||0||2||1MB IOP RAM high 1MB mirror
|-
|0x12000000||0x10000000||0x01000000||L||RW ||0||1||0||1||2||16MB IOP devices - Dev#10 Dev9_2, Dev#12 Dev9_3 ??
|-                                                             
|0x13000000||0x11000000||0x01000000||L||RW ||0||1||0||1||2||16MB Dev9/SPEED - placed here sor some reason rather than at 0x10000000.
|-
|0x1D000000||0x1D000000||0x00000400||L||RW ||0||1||0||1||2||1kB SIF SBUS BDn regs on EE, accessed through SBUS
|-
|0x1E000000||0x1E000000||0x01000000||L||RW ||0||1||0||1||2||16MB Dev#1 ROM-DVD /CS1
|-
|0x1F402000||0x1F402000||0x00000400||L||RW ||0||1||0||1||2||1kB Dev#5 CDVD /CS5
|-
|0x1F7FFC00||0x00B00400||0x00000400||L||RW ||0||1||0||1||2||1kB Cache ?
|-                                                             
|0x00BDE800||0x00B00000||0x00000400||L||R  ||0||0||0||0||-||1kB Cache. Status reg?
|-                                                             
|0x00BDEC00||0x00B00400||0x00000400||L||R  ||0||0||0||0||-||1kB Cache. Status reg?
|-                                                             
|0x1F801000||0x1F801000||0x00001000||L||RW ||0||1||0||1||2||4kB IOP devices (DMAC, SSBUSC,...) and Dev#4 SPU /CS4
|-                                                             
|0x1F802000||0x1F802000||0x00001000||L||RW ||0||1||0||1||2||4kB Dev#8 Exp2 /EXTR (PIO)
|-                                                             
|0x1F803000||0x1F803000||0x00001000||L||RW ||0||1||0||1||2||4kB Dev#8 Exp2 /EXTR (PIO)
|-                                                             
|0x1F808000||0x1F808000||0x00000400||L||RW ||0||1||0||1||2||1kB SIO2, iLink
|-                                                             
|0x1F900000||0x1F900000||0x00001000||L||RW ||0||1||0||1||2||4kB Dev#4 Hard-wired (not through SSBUSC address reg.) SPU2 regs.
|-                                                             
|0x1FC00000||0x1FC00000||0x00100000||L||RW ||0||1||0||1||2||1MB Dev#2 ROM-BOOT /CS2 0x1FC00000-0x1FFFFFFF 4MB
|-                                                             
|0x1FD00000||0x1FD00000||0x00100000||L||RW ||0||1||0||1||2||1MB Dev#2 ROM-BOOT /CS2
|-                                                             
|0x1FE00000||0x1FE00000||0x00100000||L||RW ||0||1||0||1||2||1MB Dev#2 ROM-BOOT /CS2
|-                                                             
|0x1FF00000||0x1FF00000||0x00100000||L||RW ||0||1||0||1||2||1MB Dev#2 ROM-BOOT /CS2
|-
|}
'''TLB entries = 54 (55?) up to here, of 64 maximum.
At this point the code gets the number of remaining TLB entries = 10 and disables them.
Then it sets-up 4 more entries, starting from 60:'''
{| class="wikitable"
|-
! Virtual!!Physical!!Size!!Endian (Big/little)!!RWX!!Write-Through!!Cache Inhibit!!Memory Coherence!!Guarded!!User-defined storage attribute Un n=[0-3]!!Notes
|-
|0x5F800400||0x00B00400||0x00000400||L||RW ||0||1||0||1||2||1kB IOP Cache / Scratchpad
|-
|0x5F800000||0x00B00000||0x00000400||L||RW ||0||1||0||1||2||1kB
|-
|0x1F800400||0x00B00400||0x00000400||L||RW ||0||1||0||1||2||1kB
|-
|0x1F800000||0x00B00000||0x00000400||L||RW ||0||1||0||1||2||1kB
|-
|}


PPC monitor, a homebrew application that runs on this CPU, has some documentation about it, how it works and how to run code on it along the DECKARD emulator.
===Per game configuration===
https://israpps.github.io/PPC-Monitor/


===Compatibility modes===
Deckard to keep better compatibility use some flags/settings selected per Title ID. List of configurations is stored in rom:XPARAM. Default values are listed in table below.  
The addition of this PPC CPU required some compatibility modes added. They're enabled/disabled by the rom0:XPARAM IRX module. The console had a database of games that needed compatibility modes, rom0:PS2LOGO was in charge of looking at this database and applying the patches. Games were also capable of providing compatibility modes on their own by adding a '''PARAM2''' field on their system.cnf file. Wich consisted on the XPARAM config value followed by an MD5 checksum for integrity checks (to avoid applying the XPARAM if the data was corrupted).
There were only found two revisions of this compatibility mode database, one included on SCPH-750xx, and the second one was used on SCPH-770xx and never got updated again.


Information about this database and the actual databases can be found on some notes that got recently added to the [https://github.com/ps2homebrew/Open-PS2-Loader/tree/master/notes/xparam OpenPS2Loader repository]
{| class="wikitable"
|-
! Command !! Value !! Name
|-
|0x00 ||0x1F4||PARAM_MDEC_DELAY_CYCLE
|-
|0x01||    0x7D0||PARAM_SPU_INT_DELAY_LIMIT
|-           
|0x02||      0x23||PARAM_SPU_INT_DELAY_PPC_COEFF
|-           
|0x03||    0x7D0||PARAM_SPU2_INT_DELAY_LIMIT
|-           
|0x04||      0x14||PARAM_SPU2_INT_DELAY_PPC_COEFF
|-           
|0x05||        0||PARAM_DMAC_CH10_INT_DELAY
|-           
|0x06||        1||PARAM_CPU_DELAY
|-           
|0x07||      0x20||PARAM_SPU_DMA_WAIT_LIMIT
|-           
|0x08||        0||PARAM_GPU_DMA_WAIT_LIMIT
|-           
|0x09||        0||PARAM_DMAC_CH10_INT_DELAY_DPC
|-           
|0x0A||        0||PARAM_CPU_DELAY_DPC
|-           
|0x0B||        0||PARAM_USB_DELAYED_INT_ENABLE
|-           
|0x0C||        0||PARAM_TIMER_LOAD_DELAY
|-           
|0x0D||    0x229C||PARAM_SIO0_DTR_SCK_DELAY
|-           
|0x0E||    0x6EC||PARAM_SIO0_DSR_SCK_DELAY_C
|-           
|0x0F||    0x6EC||PARAM_SIO0_DSR_SCK_DELAY_M
|-
|0x10||          1||PARAM_MIPS_DCACHE_ON
|-             
|0x11||      0x90||PARAM_CACHE_FLASH_CHANNELS
|-
|}


'''Example settings from XPARAM file. '''


=== Revisions ===
{| class="wikitable"
* 3.0 : CXD9796GP (SCPH-750XX series/L-chassis)
|-
**As the only IOP revision to do so, '''this revision needs heatsinking!'''
! Name !! Command !! Value !! Title ID
*3.0 : CXD9209GP (SCPH-770XX series/M-chassis)
|-
 
|PARAM_CPU_DELAY||6||0xB60||SLPS_250.72
Starting with N-chassis/SCPH-790XX, the IOP was integrated into the new main SoC ([[Emotion Engine#Revisions|CXD2976GB]]) together with its RAM. It still reports as version 3.0 in software.
|-
<br>Note: IOP revision (3.0) is taken from COP0 PRid which on models with PowerPC is actually emulated. So returned revision is just hardcoded value from DECKARD software IOP emulator file.
|PARAM_MIPS_DCACHE_ON||0x10||0||SLPS_250.72
 
|-
although the DECKARD emulator reports different compilation dates across different slim models (compilation date is printed at emulator startup over it's UART), it seems Sony never updated the emulator, just recompiled it.
|PARAM_CACHE_FLASH_CHANNELS||0x11||0x10||SLPS_250.79
 
|-
=== UART ===
|PARAM_CPU_DELAY||6||0xC80||SLPS_250.79
The PowerPC CPU also had an UART. Unlike the EE UART, Sony had no actual use for it, so the pads aren't even tinned.
|-
 
|PARAM_DMAC_CH10_INT_DELAY||5||0x3E8||SLPS_250.79
The signals use 3.5V logic levels and baud rate of 57600 bps
|}
 
[[File:PPC-UART.png|200px]]
 
=== AUX Coprocessor===
PowerPC series 4xx offer AUX port which functionality is similar to MIPS "COPx" solution. Not much is known about this component publicly. PS2 scene mentioned things like "[https://www.psx-place.com/threads/eject-tray-elf.19072/page-2#post-216993 Deckard SDK] " or dumping bootrom for this chip. This suggest that chip was fully reverse engineered in private circle.
 
====Opcodes Encoding====
Guessed from assembly code, this section can be highly inaccurate.
 
Bits      Description
00...05 - PPC OP identificator (all 0 for aux)
06...10 - A = Destination register for result from aux
11...15 - B = Source register for arg to Aux
16...20 - C = Seems to be used as second arg register
21...27 - Function ?
28...29 - Unknown, always 1 is opcodes used by Deckard emulator
30...31 - Unknown, always 0 is opcodes used by Deckard emulator
                                  OP    A    B    C    func. unk
For example, opcode 0x0003020C (000000 00000 00011 00000 0000010 1100) is used to set IOP/PS1 PC on Aux side using r3 PPC register as a source.
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