DMP Electronics eBOX-3350MX-AP Manual de usuario descargar pdf (Pagina 30)

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 29

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

Index 33h

D[7-4] I/O recovery time

0000 0 (default)

0001 250 ns

0010 500 ns

0011 750 ns

0100 1000 ns

0101 1250 ns

0110 1500 ns

0111 1750 ns

1000 2000 ns

1001 2250 ns

1010 2500 ns

1011 2750 ns

1100 3000 ns

1101 3250 ns

1110 3500 ns

1111 3750 ns

D[3] I/O recovery

0 disable

1 enable

D[2] On chip I/O recovery

0 disable

1 enable

4.4.3 ISA high speed change on fly

Since ISA bus is slow, our ISA high speed change-on-fly function permits ISA card operating in higher ATCLK during

specific I/O or memory accessing cycles. Index 16h ~ 18h are used to define and mask ISA memory address set 1 which will

fly to higher ATCLK frequency when setting addresses are matched. Index 19h~ 1Bh are used to define and mask ISA

memory address set 2 which will fly to higher ATCLK frequency when setting addresses are matched. Index 1Ch~ 1Dh are

used to define and mask ISA I/O address. For instance, if the CPU clock is 40 Mhz, PCLK2 = 80 Mhz and Index 1Eh : D[2:0]

= 011, then the AT clock will be PCLK2/5 = 16 Mhz in normal speed address, and PCLK2/4 = 20 Mhz in high speed address.

High frequency Index 1Eh : D[2:0] Normal frequency

7.159 MHz 000 7.159 Mhz

PCLK2/2 001 PCLK2/3

PCLK2/3 010 PCLK2/4

PCLK2/4 011 PCLK2/5

PCLK2/5 100 PCLK2/6

PCLK2/6 101 PCLK2/8

PCLK2/8 110 PCLK2/10

PCLK2/10 111 PCLK2/12

Normal frequency goes to high frequency when address matches. High frequency goes back when address does not match.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 111 112

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