SH7721 datasheet(1023/1524 Pages) RENESAS

1023 / 1524 page

Section 29

PC Card Controller (PCC)

Rev. 3.00 Jan. 18, 2008 Page 961 of 1458

REJ09B0033-0300

(2)

Continuous 16-Mbyte Area Mode

Setting 1 in bit 3 (P0MMOD) of the general control register enables the continuous 16-Mbyte area

mode. In this mode, the attribute memory space and I/O memory space are 16 Mbytes, and the

common memory space is 64 Mbytes. In the common memory space, set the PC card address in

bit 2 (P0PA25) and bit 1 (P0PA24) of the general control register to access each address of 16

Mbytes unit. By this operation, values are output to A25 and A24 pins, enabling an address space

of more than 16 Mbytes to be accessed (initial value: 0 for P0PA25). When an address of 16

Mbytes or less is accessed, no settings are required. This bit does not affect access to attribute

memory space or I/O memory space.

Figures 29.3 shows the relationship between the memory space of this LSI and the memory and

I/O spaces of the PC card in the continuous 16-Mbyte area mode. Memory space and I/O space are

supported in area 6.

The attribute memory space, common memory space, and I/O space of the PC card are provided

as 16-Mbyte physical spaces in this mode. Therefore, this LSI automatically controls

PCC_REG

pin (the value of bit 0 (P0REG) in the general control register is ignored). In area 6, the output of

PCC_REG pin is 0 when the attribute memory space or I/O space is accessed, and 1 when the

common memory space is accessed.

See the register descriptions in section 29.3, Register Descriptions for details of register settings.

This LSI memory

space

PC card address

space

General control

P0MMOD = 1

P0REG = x

Attribute memory 16

Mbytes

(Pin

PCCREG is alwys 0)

I/O space 16

Mbytes

(Pin

PCCREG is alwys 0)

Attribute memory

Common memory

I/O space

Mbytes

P0PA25 = x, P0PA24 = x

P0PA25 = 0, P0PA24 = 0

P0PA25 = 0, P0PA24 = 1

P0PA25 = 1, P0PA24 = 0

P0PA25 = 1, P0PA24 = 1

Common mermoy

(Pin

PCCREG is always 1)

Total 64

Mbytes

Not

used

H'18000000

H'1A000000

P0PA25 = x, P0PA24 = x

x: Don't care

Area 6

P0PA25

P0PA24

Figure 29.3

Continuous 16-Mbyte Area Mode (Area 6)

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