<23/29> SCSP User's Manual / 4.2.9 Sound Memory Configuration

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SCSP User's Manual / 4.2 Sound Source Register

■ Sound memory configuration register

MEM4MB (W); MEMory 4MBit

Specifies the amount of memory connected to the SCSP.

Table 4.25 Memory capacity

MEM4MB	Memory capacity
0	1Mbit DRAM used
1	Uses 4Mbit DRAM

caution
Be sure to set "1" in this system.

caution	Be sure to set "1" in this system.

Figure 4.52 Memory address mapping diagram

           4Mbit 1Mbit　                      
000000H ---- ┏━━━━━━━┓ -------- ┏━━━━━━━┓ ------                
      (1st) ┃ 4Mbit ┃ (1st) ┃ 1Mbit ┃ 000000H ~ 01FFFFH
           ┃ ┃ ┣━━━━━━━┫ ------                
           ┃ ┃ (2nd) ┃ 1Mbit ┃ 020000H ~ 03FFFFH
           ┃ ┃ ┗━━━━━━━┛ ------                
07FFFFH ┃ ┃ │ │ │                      
      ---- ┣━━━━━━━┫ -------- │ │                      
080000H ┃ 4Mbit ┃ │ │ │                      
      (2nd) ┃ ┃ │ │ │                      
           ┃ ┃ │ │ │                      
           ┃ ┃ │ │ │                      
           ┃ ┃ │ │ │                      
0FFFFFH ---- ┗━━━━━━━┛ -------- └───────┘ ------

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