DMP Electronics eBOX-3350MX-AP Uživatelský manuál stáhnout pdf (Strana 61)

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

DM&P M6117D : System on a chip

Page 60

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

cmp esi, 2000h

jz short sizing_bank_01_begin ; finish sizing bank 3 and 2

sub esi, 1000h

shl dx, 4

jmp sizing_bank_23 ; go to sizing bank 2

sizing_bank_01_begin:

mov ax, 01010h ; Set mode 31 for DRAM sizing

call Read_From_Chip

and al, 00000111b

or al, 11111000b

xchg ah, al

call Write_To_Chip

sizing_bank_01:

shl dx, 4 ; next bank

mov edi, 1000h ; A12

and dl, 0f0h

or dl, 6 ; 6 --- 16M

mov ds: word ptr[esi+edi], 0dd66h

mov ds: word ptr[esi], 066ddh ; dummy write

cmp ds: word ptr[esi+edi], 0dd66h

jz sizing_bank_01_end ; 16M, go to test next bank

mov edi, 800h ; A11

and dl, 0f0h

or dl, 5 ; 5 --- 4M

mov ds: word ptr[esi+edi], 0ee55h

mov ds: word ptr[esi], 055eeh ; dummy write

cmp ds: word ptr[esi+edi], 0ee55h

jz sizing_bank_01_end ; 4M, go to test next bank

mov edi, 400h ; A10

and dl, 0f0h

or dl, 3 ; 3 --- 1M

mov ds: word ptr[esi+edi], 0ff44h

mov ds: word ptr[esi], 044ffh ; dummy write

cmp ds: word ptr[esi+edi], 0ff44h

jz short is_1or2M ; 1 or 2M, go to is_1or2M to check

mov edi, 2 ; A1

and dl, 0f0h

or dl, 1 ; 1 --- 256K

mov ds: word ptr[esi+edi], 012abh

mov ds: word ptr[esi], 0ab12h ; dummy write

cmp ds: word ptr[esi+edi], 012abh

jz short is_2or5K ; 256 or 512K, go to is_2or5K to check

and dl, 0f0h ; none in this bank

jmp short sizing_bank_01_end

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 111 112

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