DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 64)

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

M6117D : System on a chip

DM&P

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC Page 63

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

; Otherwise, doing memory remap in the following routine

; 1) We would like to choose move-out mode

mov ax, 01111h ; Enable memory remapping

call Read_From_Chip ; Select move-out mode

and al, 11111001b

or al, 00000110b

xchg ah, al

call Write_To_Chip

mov ax, 01212h ; Set Split address SP[23-20]

call Read_From_Chip ; to [1111]

and al, 00001111b

or al, 11110000b

xchg ah, al

call Write_To_Chip

; or 2) We would like to choose split mode

mov ax, 01111h ; Enable memory remapping

call Read_From_Chip ; Select split mode

and al, 11111001b

or al, 00000100b

xchg ah, al

call Write_To_Chip

mov ax, 01212h ; Set Split address SP[23-20]

call Read_From_Chip ; to [1111]

and al, 00001111b

shl bl, 4 ; bl - total memory size

or al, bl

xchg ah, al

call Write_To_Chip

5.5 Interrupt controller edge/level trigger programming

The default setting of M6117D interrupt controller is edge trigger disregarding the value of ICW1. M6117D has the ability of

setting each IRQ to be edge or level trigger by decoding I/O ports 04d0h and 04d1h.

To enable this feature, set the bit 2 of INDEX 3Ch to ‘1’.

mov ax, 03c3ch ; Enable IRQ level trigger selection

call Read_From_Chip

or al, 00000100b

xchg ah, al

call Write_To_Chip

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DMP Electronics eBOX-3350MX-AP Manual do Utilizador Página 64