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Field Name
MEM_REFRESH_RATE
Unused and invalid
Field Name
MC_FB_START
MC_FB_TOP
This register defines the location of the frame buffer in the internal address space. The internal address space has 32 address bits. Minimum
Frame buffer size for M56 is 16 MB, and the start location is required to be on a 16 MB boundary. Therefore START(23:0) must be 0x000000 and
TOP(23:0) must be 0xFFFFFF. Only the 16 MSBs of each are loaded in the register.
Field Name
MC_AGP_START
MC_AGP_TOP
This register defines the location of the AGP space within the internal address space. The internal address space has 32 address bits (for a 4
Gbytes address range). The minimum AGP aperture granularity for M56 is 4 MB (same as Rage 6?). The start address is required to be on a 4
Mbytes boundary and the size is specified in 2 Mbytes chunks. Therefore START (21:0) must be 0x000000 and TOP (21:0) must be 0x3FFFFF.
Only the 16 MSBs of each are loaded in the register. If the Start is specified to be higher than the Top, then the AGP Aperture will be non-existent
and all addresses will be the PCI and/or Frame Buffer. Note that if the Frame Buffer Aperture is also non-existent, then all addresses will be PCI.
There is also an AGP_BASE_ADDRESS, which is used to remap the AGP addresses before sending to the AIC. When a request occurs, the
address sent to AIC = requested address - AGP_START + AGP_BASE_ADDRESS.
Field Name
AGP_BASE_ADDR
This register is used to remap the AGP addresses before sending to the AIC. When a request occurs, the address sent to the AIC =
Requested_Address - AGP_START + AGP_BASE_ADDRESS.
Field Name
AGP_BASE_ADDR_2
This is used for handling 32 Gbytes AGP Base Address. The 4 bits field represents the 4 MSBs. It extends the AGP_BASE to 36 bits instead of 32
bits.
© 2007 Advanced Micro Devices, Inc.
Proprietary
MC_TIMING_CNTL_2 - RW - 32 bits - MCIND:0x3
Bits
Default
23:16
0x0
MC_FB_LOCATION - RW - 32 bits - MCIND:0x4
Bits
Default
15:0
0x0
31:16
0xff
MC_AGP_LOCATION - RW - 32 bits - MCIND:0x5
Bits
Default
15:0
0x0
31:16
0x0
AGP_BASE - RW - 32 bits - MCIND:0x6
Bits
Default
31:0
0x0
AGP_BASE_2 - RW - 32 bits - MCIND:0x7
Bits
Default
3:0
0x0
Description
Description
NOTE: Bits 0:7 of this field are hardwired to ZERO.
NOTE: Bits 0:7 of this field are hardwired to ONE.
Description
Defines the lowest address of the AGP Aperture
Defines the highest address of the AGP Aperture
Description
Defines the base address of the AGP aperture. Bits 21:0 must be '0'
Description
M56 Register Reference Manual
Memory Controller Registers
2-3
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