DP83905AVQB National Semiconductor, DP83905AVQB Datasheet - Page 27

• Manufacturer Part Number: DP83905AVQB
• Description: IC CONTROLR AT/LAN TP IN 160PQFP
• Manufacturer: National Semiconductor
• Series: AT/LANTIC™r

Specifications of DP83905AVQB

• Controller Type: AT, LAN Twisted-Pair Interface Controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 100mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: *DP83905AVQB

Bits
0 –3
4
5
6
7
5 0 Register Descriptions
Hardware Configuration Register C
This register is configured during a RESET and can not be accessed by software
Symbols
BPS0
COMP
INTMOD
CLKSEL
SOFEN
b
3
BOOT PROM SELECT Selects address at which boot PROM begins and the size When the system reads
within the selected memory area AT LANTIC Controller reads the data in through MSD0 – 7 and drives it onto
the system data bus The following are valid addresses and sizes
Bit 3
COMPATIBLE This bit determines if the AT LANTIC Controller’s memory and I O maps are compatible with
the EtherCard PLUS and Novell boards or if they use the full 64k address space available to the NIC A low level
indicates compatible mode
INTERRUPT MODE When this bit is low the AT LANTIC Controller is in Direct Drive interrupt mode When it is
high Coded Output interrupt mode is used
CLOCK SELECT If this bit is low the NIC core is clocked by the 20 MHz If this bit is high the NIC core is
clocked by the signal on the BSCLK pin
SOFTWARE ENABLE If this bit is set low then the user can program configuration registers A and B in
software If this bit is set high then the configuration registers are not accessible If EECONFIG is high the
configuration from the switches will be overwritten by the configuration from the EEPROM even if this bit is
pulled high
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
SOFEN
7
Bit 2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Bit 1
CLKSEL
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
6
Bit 0
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(Continued)
INTMOD
Address
0DC00H
0C000H
0C400H
0C800H
0CC00H
0D000H
0D400H
0D800H
0C000H
0C800H
0D000H
0D800H
0C000H
0D000H
5
X
COMP
No boot PROM
27
4
Size (I O Shared Mem )
32k 32k
32k 32k
32k 32k
32k 32k
64k 64k
64k 64k
8k 16k
8k 16k
8k 16k
8k 16k
8k 16k
8k 16k
8k 16k
8k 16k
Function
BPS3
3
BPS2
2
BPS1
1
BPS0
0