242
Bit 6: A6BST1
Bit 5: A6BST0
Description
0
0
Access area 6 accessed as ordinary memory
(initial value)
1
Burst access of area 6 (4 consecutive accesses). Can
be used when bus width is 8, 16, or 32.
1
0
Burst access of area 6 (8 consecutive accesses). Can
be used when bus width is 8 or 16. Should not be
specified when bus width is 32.
1
Burst access of area 6 (16 consecutive accesses). Can
be used only when bus width is 8. Should not be
specified when bus width is 16 or 32.
Bits 4 to 2—Area 2, Area 3 Memory Type (DRAMTP2, DRAMTP1, DRAMTP0): Designate
the types of memory connected to physical space areas 2 and 3. Ordinary memory, such as ROM,
SRAM, or flash ROM, can be directly connected. Synchronous DRAM can also be directly
connected.
Bit 4: DRAMTP2 Bit 3: DRAMTP1 Bit 2: DRAMTP0 Description
0
0
0
Areas 2 and 3 are ordinary memory
(Initial value)
1
Reserved (Setting prohibited)
1
0
Area 2: ordinary memory; area 3:
synchronous DRAM
*
2
1
Areas 2 and 3 are synchronous DRAM
*
1,
*
2
1
0
0
Reserved (Setting prohibited)
1
Reserved (Setting prohibited)
1
0
Reserved (Setting prohibited)
1
Reserved (Setting prohibited)
Note:
*
1 When selecting this mode, set the same bus width for area 2 and area 3.
*
2 Do not access synchronous DRAM when clock ratio I
φ
:B
φ
= 1:1
Bit 1—Area 5 Bus Type (A5PCM): Designates whether to access physical space area 5 as
PCMCIA space.
Bit 1: A5PCM
Description
0
Physical space area 5 accessed as ordinary memory
(Initial value)
1
Physical space area 5 accessed as PCMCIA space
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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