Epson Research and Development

Page 19

Vancouver Design Center

 

 

 

5.4 Memory Mapping and Aliasing

When the TX3912 accesses the PC Card slots without the ITE IT8368E, its system memory is mapped as in Table , “”.

Note

Bits CARD1IOEN and CARD2IOEN need to be set in the TX3912 Memory

Configuration Register 3.

Table 5-1: TX3912 to Unbuffered PC Card Slots System Address Mapping

TX3912 Address

Size

Function

 

Function

(CARDnIOEN=0)

 

(CARDnIOEN=1)

 

 

 

 

 

 

 

 

0800 0000h

64Mb

Card 1 Attribute

 

Card 1 IO

 

 

 

 

 

0C00 0000h

64Mb

Card 2 Attribute

 

Card 2 IO

 

 

 

 

 

6400 0000h

64Mb

 

Card 1 Memory

 

 

 

 

6400 0000h

64Mb

 

Card 2 Memory

 

 

 

 

 

When the TX3912 accesses the PC Card slots buffered through the ITE IT8368E, bits CARD1IOEN and CARD2IOEN are ignored and the attribute/IO space of the TX3912 is divided into Attribute, IO and S1D13504 access. Table 5-2:, “TX3912 to PC Card Slots Address Remapping using the IT8368E” provides all the details of the Attribute/IO address re-allocation by the IT8368E.

Table 5-2: TX3912 to PC Card Slots Address Remapping using the IT8368E

IT8368E Uses PC Card Slot #

TX3912 Address

Size

Function

 

 

 

 

 

0800 0000h

16M byte

Card 1 IO

 

 

 

 

 

0900 0000h

8M byte

S1D13504 registers,

 

aliased 131,072 times at 64 byte intervals

 

 

 

1

 

 

 

0980 0000h

8M byte

S1D13504 display buffer,

 

aliased 4 times at 2Mb intervals

 

 

 

 

 

 

 

 

0A00 0000h

32M byte

Card 1 Attribute

 

 

 

 

 

6400 0000h

64M byte

Card 1 Memory

 

 

 

 

 

0C00 0000h

16M byte

Card 2 IO

 

 

 

 

 

0D00 0000h

8M byte

S1D13504 registers,

 

aliased 131,072 times at 64 byte intervals

 

 

 

2

 

 

 

0D80 0000h

8M byte

S1D13504 display buffer,

 

aliased 4 times at 2Mb intervals

 

 

 

 

 

 

 

 

0E00 0000h

32M byte

Card 2 Attribute

 

 

 

 

 

6800 0000h

64M byte

Card 2 Memory

 

 

 

 

Interfacing to the Toshiba MIPS TX3912 Processor

S1D13504

Issue Date: 01/02/02

X19A-G-012-04

Page 499
Image 499
Epson S1D13504 manual 64Mb Card 2 Attribute, 64Mb Card 1 Memory, 64Mb Card 2 Memory