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files/docs/snes/memory_mapping_table.txt
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129
files/docs/snes/memory_mapping_table.txt
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+=-=-=-=-=-=-=-=-=-=-=+
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| SNES Memory Mapping |
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| By: ]SiMKiN[ |
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| v2.0 |
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+=-=-=-=-=-=-=-=-=-=-=+
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<EFBFBD> FastROM's can execute at 3.58Mhz
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<EFBFBD> SlowROM's can only execute 2.68Mhz
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<20> The SNES lets you access ROM through bank $00 onwards and bank
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$80 onwards such that locations $00:8000 and $80:8000 are congruent,
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(they access the same locations.)
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<20> When accessing bank $00 onwards the 65816 runs at 2.68Mhz. However,
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when accessing bank $80 onwards the 65816 can run at 2.68Mhz or
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3.58Mhz depending on how you set bit 0 of $420D.
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<20> This Document Contains Information Regarding ROM's upto 32mbit.
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If you have any information regarding ROM's above 32mbit please send
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E-Mail to 'simkin@innocent.com'
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+======================================================================+
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| Mode 20: LoROM Memory Model (32k Banks) |
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| --------------------------------------- |
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| <20> $80-$ef : $8000-$ffff |
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| Mirrored to $00-6f |
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| <20> $f0-$ff : $8000-$ffff |
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+=========+=============+====================================+=========+
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| Bank | Offset | Definition | Shadow |
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+=========+=============+====================================+=========+
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| $00-$2f | $0000-$1fff | LowRAM, shadowed from $7e | $7e |
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| | $2000-$2fff | PPU1, APU | $00-$3f |
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| | $3000-$3fff | SFX, DSP, etc. | $00-$3f |
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| | $4000-$41ff | Controller | $00-$3f |
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| | $4200-$5fff | PPU2, DMA, etc. | $00-$3f |
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| | $6000-$7fff | RESERVED | $00-$3f |
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| | $8000-$ffff | (Mode 20 ROM) | ------- |
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+---------+-------------+------------------------------------+---------+
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| $30-$3f | $0000-$1fff | LowRAM, shadowed from $7e | $7e |
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| | $2000-$2fff | PPU1, APU | $00-$3f |
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| | $3000-$3fff | SFX, DSP, etc. | $00-$3f |
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| | $4000-$41ff | Controller | $00-$3f |
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| | $4200-$5fff | PPU2, DMA, etc. | $00-$3f |
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| | $6000-$7fff | RESERVED | ------- |
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| | $8000-$ffff | (Mode 20 ROM) | $80-$bf |
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+---------+-------------+------------------------------------+---------+
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| $40-$6f | $0000-$7fff | RESERVED | ------- |
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| | $8000-$ffff | (Mode 20 ROM) | $C0-$EF |
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+---------+-------------+------------------------------------+---------+
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| $70-$77 | $0000-$ffff | (Mode 20 SRAM) 256KBytes | ------- |
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+---------+-------------+------------------------------------+---------+
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| $78-$7d | $0000-$ffff | RESERVED | ------- |
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+---------+-------------+------------------------------------+---------+
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| $7e | $0000-$1fff | LowRAM | $00-$3f |
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| | $2000-$7fff | HighRAM | ------- |
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| | $8000-$ffff | Expanded RAM | ------- |
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+---------+-------------+------------------------------------+---------+
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| $7f | $0000-$ffff | Expanded RAM | ------- |
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+---------+-------------+------------------------------------+---------+
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| $80-$ef | $0000-$ffff | Mirror of $00-$6f | $00-$6f |
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+---------+-------------+------------------------------------+---------+
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| $f0-$ff | $0000-$7fff | RESERVED | ------- |
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| | $8000-$ffff | (Mode 20 ROM) | ------- |
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+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+
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+======================================================================+
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| Mode 21: HiROM Memory Model (64k Banks) |
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| --------------------------------------- |
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| <20> $C0-$ff : $0000-$ffff |
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| High Parts ONLY '($8000-$ffff)' are Shadowed to $00-3f |
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+=========+=============+====================================+=========+
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| Bank | Offset | Definition | Shadow |
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+=========+=============+====================================+=========+
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| $00-$2f | $0000-$1fff | LowRAM, shadowed from $7e | $7e |
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| | $2000-$2fff | PPU1, APU | $00-$3f |
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| | $3000-$3fff | SFX, DSP, etc. | $00-$3f |
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| | $4000-$41ff | Controller | $00-$3f |
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| | $4200-$5fff | PPU2, DMA, etc. | $00-$3f |
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| | $6000-$7fff | RESERVED | $00-$3f |
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| | $8000-$ffff | (Mode 21 ROM) from $C0-$EF | $C0-$EF |
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+---------+-------------+------------------------------------+---------+
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| $30-$3f | $0000-$1fff | LowRAM, shadowed from $7e | $7e |
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| | $2000-$2fff | PPU1, APU | $00-$3f |
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| | $3000-$3fff | SFX, DSP, etc. | $00-$3f |
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| | $4000-$41ff | Controller | $00-$3f |
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| | $4200-$5fff | PPU2, DMA, etc. | $00-$3f |
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| | $6000-$7fff | (Mode 21 SRAM) 256KBytes | ------- |
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| | $8000-$ffff | (Mode 21 ROM) from $C0-$EF | $C0-$EF |
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+---------+-------------+------------------------------------+---------+
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| $40-$6f | $0000-$7fff | (Mode 21 ROM) from $C0-$EF | $C0-$EF |
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+---------+-------------+------------------------------------+---------+
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| $70-$77 | $0000-$ffff | (Mode 20 SRAM) 256KBytes | ------- |
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+---------+-------------+------------------------------------+---------+
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| $78-$7d | $0000-$ffff | RESERVED | ------- |
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+---------+-------------+------------------------------------+---------+
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| $7e | $0000-$1fff | LowRAM | $00-$3f |
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| | $2000-$7fff | HighRAM | ------- |
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| | $8000-$ffff | Expanded RAM | ------- |
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+---------+-------------+------------------------------------+---------+
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| $7f | $0000-$ffff | Expanded RAM | ------- |
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+---------+-------------+------------------------------------+---------+
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| $80-$bf | $0000-$ffff | Mirror of $00-$3f | $00-$3f |
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+---------+-------------+------------------------------------+---------+
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| $c0-$ff | $0000-$ffff | (Mode 21 ROM) | ------- |
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+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+
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<EFBFBD> ROM: The SNES ROM Image
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<EFBFBD> RAM: The SNES Work Memory (WRAM)
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LowRAM, HighRAM, & Expanded RAM
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All together = 128 Kilo-Bytes
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<EFBFBD> SRAM: Save RAM (Extra RAM added by Cart)
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The SNES only utilizes 256 Kilo-bits
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However 256 Kilo-Bytes are provided.
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<EFBFBD> APU: Audio Processing Unit
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SPC700, Inside which has a DSP
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<EFBFBD> PPU: Picture Processing Unit
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PPU1: 5c77-01
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PPU2: 5c78-03
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<EFBFBD> SFX: Super FX Cart Chip, by Nintendo
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<EFBFBD> DSP: Digital Signal Processing Cart Chip
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a.k.a. 'NEC mUPD77C25'
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<EFBFBD> Shadow: "Congruent Bank". Same meaning as Mirror.
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_____________________________________________________
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.o(_Thanx to: zsKnight, Lord Esnes, Y0SHi, and MintaBoo_)o.
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