
8019AS.doc 
2001-05-10
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SPECIFICATION  
RTL8019AS  
25
5.2.2. Logical Device Control Registers 
Index 
Name 
30H 
Activate  
Type 
R/W 
Definition 
For each logical device there is one Activate register that controls 
whether or not the logical device is active on the ISA bus. Bit[0], if set, 
activates the logical device. Before a logical device is activated, I/O 
range check must be disabled. 
This register is used to perform a conflict check on the I/O port range 
programmed for use by a logical device. 
Bit[1] - This bt, when set, enables I/O range check. 
I/O range check is only valid when the logical device is inactive. 
Bit[0] - If set, this bit forces the logical device to respond to I/O reads of 
the logical device's assigned I/O range with a 55H when I/O range check 
is in operation. If clear, the logical device drives AAH.  
31H 
I/O Range Check 
R/W 
5.2.3. Logical Device Configuration Registers 
Memory Configuration Registers 
Index 
Name 
40H 
BROM base address 
bits[23:16] 
41H 
BROM base address 
bits[15:0] 
42H 
Memory Control 
Note: The BROM size of RTL8019AS is determined by the 9346 contents but not the memory 
configuration registers. 
I/O Configuration Registers 
Index 
Name 
Type 
60H 
I/O base address bits[15:8] 
R/W 
Bits[15:10] are read only with values=0. 
All other bits are read/write bits. 
61H 
I/O base address bits[7:0] 
R/W 
Bits[4:0] are read only with values=0. 
All other bits are read/write bits. 
Interrupt Configuration Registers  
Index 
Name 
Type 
70H 
IRQ level 
R/W 
Read/write value indicating a selected interrupt level. 
Bits[3:0] select which ISA interrupt level is used. One selects IRQ1, fifteen 
selects IRQ15. IRQ0 is not a valid interrupt selection and represents no 
interrupt selection.  
Type 
R/W 
Definition 
Bits[23:20] & bit[17] are read only with values=0. 
All other bits are read/write bits. 
Bits[13:8] are read only with values=0.  
All other bits are read/write bits. 
00H. (Only 8-bit operation is supported for BROM) 
R/W 
R 
Definition 
Definition