DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 63)

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

DM&P M6117D : System on a chip

Page 62

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

check_mode_end:

mov bx, cs: word ptr[si+2]

mov ax, 01010h ; Set DRAM Mode

call Read_From_Chip

and al, 00000111b

or al, bl

xchg ah, al

call Write_To_Chip

;

; Do your memory remapping setting here.

;

; Use the total DRAM size to check whether the remapping is

; allowable or not.

; Use the total DRAM size to set the bit 7-4 of INDEX 12h Split address.

; Select the remap mode by setting the bit 1 of INDEX 11h.

5.4 Remapping Memory

If enable memory remap(INDEX 11h, bit 2), we have two choices: split or move-out. We can use the split mode when the

size of the DRAM is less than 16M owing to the limitation of hardware. In this way, the available memory is increased. When

the memory size is less than 16M, we can also choose the move-out mode. Therefore, we should get the DRAM size by the

Auto_DRAM_Sizing routine. The details of setting the configure registers are described as follows :

; Get the total memory size to bl

;

; 1). Get the total memory size from Auto_DRAM_Sizing

mov bl, cs: byte ptr[si+4]

; or 2). Using the following routine to get the total memory size from reading DRAM mode

mov al, 010h

call Read_From_Chip

and al, 11111000b

xor dx, dx

or dl, al

mov si, offset cs: mem_config_table

mov cx, 32

check_mem_mode:

mov ax, cs: word ptr[si+2]

cmp dx, ax

jz short check_mem_mode_end

add si, 6

loop check_mem_mode

check_mem_mode_end:

mov bl, cs: byte ptr[si+4]

cmp bl, 16

ja do_remap_memory

; if bl >= 16 (the memory size is equal to or greater than 16M ), disable memory remapping.

mov ax, 01111h ; Disable memory remapping

call Read_From_Chip

and al, 11111011b

xchg ah, al

call Write_To_Chip

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