DMP Electronics eBOX-3350MX-AP Manual de usuario descargar pdf (Pagina 57)

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

DM&P M6117D : System on a chip

Page 56

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

e) Read data from configure register

; INPUT : AL - INDEX#

; OUTPUT : AL - Data

; ACTION : Read data from the value of AL INDEX

; Interrupt controller and Stack are available

Read_From_Chip PROC

cli

push ax

Open_Chip

pop ax

out 022h, al

IO_Delay

in al, 023h

IO_Delay

push ax

Close_Chip

pop ax

sti

ret

ENDP

5.2 Detection and Setting of Fast Page Mode and EDO DRAMs

; BD0 must be pulled high 10K

; Stack must be available

; all routines in this section must be executed at ROM access

DRAM_Type_Detection:

mov ax, 01010h ; Set mode 5 for DRAM detection

call Read_From_Chip

and al, 00000111b

or al, 01010000b

xchg ah, al

call Write_To_Chip

mov ax, 03c3ch ; Set the bit 1 of INDEX 3Ch to ‘1’

call Read_From_Chip ; to enable EDO DRAM timing detect

or al, 00000010b ; mode.

xchg ah, al

call Write_To_Chip

push ds

mov ax, 0h

mov ds, ax

mov ds: word ptr[0h], 0aaaah

mov ds: word ptr[1000h], 05555h ; dummy write

cmp ds: word ptr[0h], 0aaaah

je Is_EDO_type_DRAM

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 111 112

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