Hardware/Memory Interface

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Memory Interface
Access
BroadwayFull
StarletFull
Registers
Base0x0c004000
Length0x80
Access size16 bits
Byte orderBig Endian
IRQs
Broadway7
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This is most likely the same as (or at least mostly similar to) the Memory Interface on the Flipper chip (see YAGCD).
These registers are used by some programs (running on Broadway) to perform indirect accesses on the Memory Controller registers.


Memory Interface Registers
Address Bits Name Description
0x0d8b4000 16 MEM_MARR0_START Memory Protection
0x0d8b4002 16 MEM_MARR0_END
0x0d8b4004 16 MEM_MARR1_START
0x0d8b4006 16 MEM_MARR1_END
0x0d8b4008 16 MEM_MARR2_START
0x0d8b400a 16 MEM_MARR2_END
0x0d8b400c 16 MEM_MARR3_START
0x0d8b400e 16 MEM_MARR3_END
0x0d8b4010 16 MEM_MARR_CONTROL MARR{0-3} permissions
0x0d8b4012 16 MEM_CP_BW_DIAL Bandwidth Dial (Command Processor)
0x0d8b4014 16 MEM_TC_BW_DIAL Bandwidth Dial (Texture Control)
0x0d8b4016 16 MEM_PE_BW_DIAL Bandwidth Dial (Pixel Engine)
0x0d8b4018 16 MEM_CPUR_BW_DIAL Bandwidth Dial (CPU read)
0x0d8b401a 16 MEM_CPUW_BW_DIAL Bandwidth Dial (CPU write)
0x0d8b401c 16 MEM_INT_ENBL MARR interrupt enable
0x0d8b401e 16 MEM_INT_STAT MARR interrupt status
0x0d8b4020 16 MEM_INT_CLR MARR interrupt clear/mask (?)
0x0d8b4022 16 MEM_INT_ADDRL MARR interrupt address (lo bits)
0x0d8b4024 16 MEM_INT_ADDRH MARR interrupt address (hi bits)
0x0d8b4026 16 MEM_REFRESH
0x0d8b4028 16 MEM_CONFIG
0x0d8b402a 16 MEM_LATENCY
0x0d8b402c 16 MEM_RDTORD
0x0d8b402e 16 MEM_RDTOWR
0x0d8b4030 16 MEM_WRTORD
0x0d8b4032 16 MEM_CP_REQCOUNTH Memory Request Count (Command Processor) (hi bits)
0x0d8b4034 16 MEM_CP_REQCOUNTL Memory Request Count (Command Processor) (lo bits)
0x0d8b4036 16 MEM_TC_REQCOUNTH Memory Request Count (Texture Control) (hi bits)
0x0d8b4038 16 MEM_TC_REQCOUNTL Memory Request Count (Texture Control) (lo bits)
0x0d8b403a 16 MEM_CPUR_REQCOUNTH Memory Request Count (CPU read) (hi bits)
0x0d8b403c 16 MEM_CPUR_REQCOUNTL Memory Request Count (CPU read) (lo bits)
0x0d8b403e 16 MEM_CPUW_REQCOUNTH Memory Request Count (CPU write) (hi bits)
0x0d8b4040 16 MEM_CPUW_REQCOUNTL Memory Request Count (CPU write) (lo bits)
0x0d8b4042 16 MEM_DSP_REQCOUNTH Memory Request Count (DSP) (hi bits)
0x0d8b4044 16 MEM_DSP_REQCOUNTL Memory Request Count (DSP) (lo bits)
0x0d8b4046 16 MEM_IO_REQCOUNTH Memory Request Count (I/O) (hi bits)
0x0d8b4048 16 MEM_IO_REQCOUNTL Memory Request Count (I/O) (lo bits)
0x0d8b404a 16 MEM_VI_REQCOUNTH Memory Request Count (Video Interface) (hi bits)
0x0d8b404c 16 MEM_VI_REQCOUNTL Memory Request Count (Video Interface) (lo bits)
0x0d8b404e 16 MEM_PE_REQCOUNTH Memory Request Count (Pixel Engine) (hi bits)
0x0d8b4050 16 MEM_PE_REQCOUNTL Memory Request Count (Pixel Engine) (lo bits)
0x0d8b4052 16 MEM_RF_REQCOUNTH
0x0d8b4054 16 MEM_RF_REQCOUNTL
0x0d8b4056 16 MEM_FI_REQCOUNTH
0x0d8b4058 16 MEM_FI_REQCOUNTL
0x0d8b405a 16 MEM_DRV_STRENGTH
0x0d8b405c 16 MEM_REFRSH_THHD
0x0d8b4060 16 MEM_CPUAHMR_REQCOUNTH
0x0d8b4062 16 MEM_CPUAHMR_REQCOUNTL
0x0d8b4064 16 MEM_CPUAHMW_REQCOUNTH
0x0d8b4066 16 MEM_CPUAHMW_REQCOUNTL
0x0d8b4068 16 MEM_DMAAHMR_REQCOUNTH
0x0d8b406a 16 MEM_DMAAHMR_REQCOUNTL
0x0d8b406c 16 MEM_DMAAHMW_REQCOUNTH
0x0d8b406e 16 MEM_DMAAHMW_REQCOUNTL
0x0d8b4070 16 MEM_ACC_REQCOUNTH
0x0d8b4072 16 MEM_ACC_REQCOUNTL
0x0d8b4074 16 MEM_DDRREG_ADDR DDR register offset
0x0d8b4076 16 MEM_DDRREG_DATA DDR register data
0x0d8b4078 16 MEM_DRV_PSTRENGTH



Memory Protection

The MARR registers are used to configure memory protection (where the granularity of particular regions are defined as a chunk of pages). Protected memory is always 1 page long (where page size is 1024 bytes). If the CPU tries to access the protected region in a way that is not allowed, an external interrupt will be raised. Page addresses are calculated with (physical_address >> 10). [check]

MEM_MARR0_START (0x0C004000)
  150
Access R/W

MEM_MARR0_END (0x0C004002)
  150
Access R/W

MEM_MARR1_START (0x0C004004)
  150
Access R/W

MEM_MARR1_END (0x0C004006)
  150
Access R/W

MEM_MARR2_START (0x0C004008)
  150
Access R/W

MEM_MARR2_END (0x0C00400a)
  150
Access R/W

MEM_MARR3_START (0x0C00400c)
  150
Access R/W

MEM_MARR3_END (0x0C00400e)
  150
Access R/W


MEM_MARR_CONTROL (0x0C004010)
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U R/W R/W R/W R/W
Field Ch3 Ch2 Ch1 Ch0
Field Description
ChX 00: Access Denied, 01: Read Only, 10: Write Only, 11: Read/Write


MEM_INT_ENBL (0x0C00401C)
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U ?/W ?/W ?/W ?/W ?/W
Field ChAll Ch3 Ch2 Ch1 Ch0
Field Description
ChX When set, interrupt from that channel is enabled.
ChAll When set, all MI interrupts are enabled.


MEM_INT_STAT (0x0C00401E)
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U R/W R/W R/W R/W R/W
Field ChAll Ch3 Ch2 Ch1 Ch0
Field Description
ChX When set, IRQ has been requested. Writing 1 clears it.
ChAll All MI interrupts. (?)

MEM_INT_CLR (0x0C004020)
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U ? U
Field Unk
Field Description
Unk ? Set when MI interrupt has been asserted ? Should be cleared by interrupt handler


MEM_INT_ADDRL (0x0C004022)
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access R/? U
Field Low

MEM_INT_ADDRH (0x0C004024)
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U R/?
Field High
Field Description
High Bits 29->16 of the address that the protection exception occurred on.
Low Bits 15->5 of the address that the protection exception occurred on.