Rainbow-electronics W90P710CDG Manual de usuario descargar pdf (Pagina 79)

100

101

W90P710CD/W90P710CDG

Publication Release Date: September 19, 2006

- 79 - Revision B2

External I/O Control Registers（EXT0CON – EXT3CON）

The W90P710 supports an external device control without glue logic. It is very cost effective because

address decoding and control signals timing logic are not needed. Using these control registers you can

configure special external I/O devices for providing the low cost external devices control solution.

EXT0CON 0xFFF0_1018 R/W External I/O 0 control register 0x0000_0000

EXT1CON 0xFFF0_101C R/W External I/O 1 control register 0x0000_0000

EXT2CON 0xFFF0_1020 R/W External I/O 2 control register 0x0000_0000

EXT3CON 0xFFF0_1024 R/W External I/O 3 control register 0x0000_0000

31 30 29 28 27 26 25 24

BASADDR

23 22 21 20 19 18 17 16

BASADDR SIZE

15 14 13 12 11 10 9 8

ADRS tACC tCOH

7 6 5 4 3 2 1 0

tACS tCOS DBWD

BITS DESCRIPTION

[31:11] BASADDR

Base address pointer of external I/O bank 0~3

The start address of each external I/O bank is calculated as “BASADDR”

base pointer << 18.

Each external I/O bank base address pointer together with the “SIZE” bits

constitutes the whole address range of each external I/O bank.

[18:16] SIZE

The size of the external I/O bank 0~3

SIZE [18:16] Byte

0 0 0 256K

0 0 1 512K

0 1 0 1M

0 1 1 2M

1 0 0 4M

1 0 1 8M

1 1 0 16M

1 1 1 REVERSED

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 551 552

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Rainbow-electronics W90P710CDG Manual de usuario Pagina 79

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