DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 109)

386SX Single Chip PC Jan Yin Chan Electronics Co.,LTD.

DM&P M6117D : System on a chip

Page 108

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC

8F-1,No.22,Wuchyuan 2RD.,Hsin Chuang city Taipei Hsien, Taiwan, R.O.C. Tel: 886-(02) 2298-0770 Fax: (02) 2299-1883

Example D: Set GPCS0 decoder to Memory address C800:0 to C800:3FFF(16Kbyte) 8bit data bus read/write.

; Please use TASM to compiler the following program.

; Execute under DOS environment.

;

.286

.model small

.code

Start proc c

mov ax,0c513h ; Unlock configuration register

call writechip

mov ax,3144h ; Enable memory address A[25-11], 8bit data bus read/write.

call writechip

mov ax,0341h ; Set the GPCS0 A[25-18] is 03h. A25 A24 A23 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10

call writechip ; 0 0 0 0 0 0 1 1 0 0 1 0 0 0 0 X

mov ax,2040h ; Set the GPCS0 A[17-11] is 20h.

call writechip

mov ax,0043h ; Set the GPCS0 mask A[25-18] is 00h, address A[25-18] full compare(set to" 0" is compare, set to "1" is don't care).

call writechip

mov ax,0042h ; Set the GPCS0 mask A[17-11] is 0000111Xb, address A[17-11] high nibble compare, low nibble don't care.

call readchip :

and al,00000001b

or al,00001111b ; set low nibble is don't care compare.

xchg ah,al ;

call writechip ;

mov ax,0040h ;

call readchip

or al,00000001b

xchg ah,al

call writechip ; Active GPCS0 decoder single.

mov ax,0013h ; Lock configuration register

call writechip

mov ax,4c00h

int 21h

endp

readchip proc c

out 22h,al

nop

in al,23h

nop

ret

endp

writechip proc c

out 22h,al

nop

xchg ah,al

out 23h,al

nop

xchg ah,al

ret

endp

end

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