SH7041A datasheet(227/923 Pages) RENESAS

部件名	SH7041A

功能描述	Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

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制造商	RENESAS [Renesas Technology Corp]

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10.4

DRAM Access

10.4.1

DRAM Direct Connection

When address space A31–A24 = H'01 has been accessed, the corresponding space becomes a 16-

Mbyte DRAM space, and the DRAM interface function can be used to directly connect the

SH7040 Series to DRAM.

Row address and column address are always multiplexed for DRAM space. The amount of row

address multiplexing can be selected as from 9 to 12 bits by setting the AMX1 and AMX0 bits of

the DCR.

Table 10.5

AMX Bits and Address Multiplex Output

Row Address

Column Address

AMX1

AMX0

Shift

Amount

Output Pins

Output

Address

Output

Address

Output

Pins

9 bit

A21–A15

A21–A0

A14–A0

A23–A9

10 bit

A21–A14

A21–A0

A13–A0

A23–A10

11 bit

A21–A13

A21–A0

A12–A0

A23–A11

12 bit

A21–A12

A21–A0

A11–A0

A23–A12

In addition to ordinary read and write accesses, burst mode access using high speed page mode is

supported.

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