F84045 Asiliant Technologies, F84045 Datasheet - Page 37

• Manufacturer Part Number: F84045
• Manufacturer: Asiliant Technologies

Specifications of F84045

• Lead Free Status / Rohs Status: Not Compliant

Index
07
08-0F
Revision 1.0
Index
07
3:0
7:4
This register is usually set as follows:
* The 14 MHz mode requires 14.3 MHz brought into the 4041 on either the LDEV1# or GPA pin, and
ISA clock sel
Function
Bits
ISA Bus Clock selection.
Clock select for ISA bus and internal ISA state machine. The source of the clock is CLKIN except
(Reserved)
0Dh for CLKIN = 25 MHz (CLKIN/3)
0Ch for CLKIN = 33.3 MHz (CLKIN/4)
0Bh for CLKIN = 40 MHz (CLKIN/5)
0Ah for CLKIN = 50 MHz (CLKIN/6)
09h for CLKIN = 66.7 MHz (CLKIN/8)
07h for BUSCLK = 14.3 MHz / 2 *
(4045 chip)
2/10/95
when 14.3 MHz is selected as the source. The internal ISA state machine clock runs at twice the
externally generated ISA BUSCLK rate. The CLKIN frequency in parenthesis indicates which
settings to use to yield an 8.00 or 8.33MHz BUSCLK rate. CLKIN will be the same frequency as
the CPU when using the 1X mode, or twice the CPU speed when using the 2X mode (see CLKIN
pin description).
Configuration Register 3Ch programmed to select 14.3 MHz.
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
D7
-
.
Description
CLKIN/20
CLKIN/16
CLKIN/12
(Reserved)
(Reserved)
(Reserved)
(Reserved)
14.3 MHz clock input (a multifunction pin) divided by 2
CLKIN/10
CLKIN/8
CLKIN/6
CLKIN/5
CLKIN/4
CLKIN/3
(Reserved )
(Reserved )
D6
-
Subject to change without notice
Default = 00.
D5
-
(Power-up default. 160 MHz CLKIN)
(133.3 MHz CLKIN)
(100 MHz CLKIN)
(80 MHz CLKIN)
(66.7 MHz CLKIN)
(50 MHz CLKIN)
(40 MHz CLKIN)
(32 or 33.3 MHz CLKIN)
(25 MHz CLKIN)
36
D4
-
ISA clk3
D3
ISA clk2
D2
ISA clk1
Configuration Registers
Preliminary
D1
ISA clk0
D0
CS4041