DMP Electronics eBOX-3350MX-AP Manual de usuario descargar pdf (Pagina 70)

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 69

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

A. Flowchart of Detecting Memory Mode

Memory Auto Sizing

Disable parity checks, Remapping and Shadowed regions

LPORTW 010h, 0E8h ; Assume Mode = 30

n = 3

Choose an address

HA0 with HA0[13,12]=11

Choose an address

HA0 with HA0[13,12]=10

Define addresses as follows

HA1 : HA0 & HA0[24,20,11,10] = 0000

HA2 : HA0 & HA0[24,20,11,10] = 0010

HA3 : HA0 & HA0[24,20,11,10] = 1000

HA4 : HA0 & HA0[24,20,11,10] = 0001

HA5 : HA0 & HA0[24,20,11,10] = 0100

Memory Write : Address = HA1 with Data = D1

Memory Read : Address = HA1 with Data = D2

D2= D1

Bank(n) = 0

Bank n is empty

Yes

Memory Write : Address = HA2 with Data = D3

Memory Read : Address = HA1 with Data = D4

D3 = D4

D4= D2

Error

Bank(n) = 5

Bank n is 4M DRAM

Memory Write : Address = HA3 with Data = D5

Memory Read : Address = HA1 with Data = D6

D5 = D6

Yes

D6 = D4

Error

Yes

Bank(n) = 4

Bank n is 2M DRAM

Yes

Memory Write : Address = HA4 with Data = D7

Memory Read : Address = HA1 with Data = D8

n=3

n=2

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 111 112

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DMP Electronics eBOX-3350MX-AP Manual de usuario Pagina 70

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