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DP83907 Datasheet(PDF) 25 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83907
Description  AT/LANTIC??II
PDF  70 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83907 Datasheet(HTML) 25 Page - National Semiconductor (TI)

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50 Register Descriptions (Continued)
HARDWARE CONFIGURATION REGISTER C
This register is configured during a RESET and can be accessed by 3rd consecutive read config register A
7
6
5
4
3210
SOFEN
RES
RES
RES
BPS3
BPS2
BPS1
BPS0
Bit
Symbol
Function
0–3
BPS0–3
BOOT PROM SELECT
Selects address at which boot PROM begins and the size When the system reads
within the selected memory area DP83907 reads the data in through MSD0 – 7 and drives it onto the system
data bus The following are valid addresses and sizes
Bit 3
Bit 2
Bit 1
Bit 0
Address
Size
0
0
0
X
X
No Boot PROM
0
0
1
0
0C000H
8K
0
0
1
1
0C400H
8K
0
1
0
0
0C800H
8K
0
1
0
1
0CC00H
8K
0
1
1
0
0D000H
8K
0
1
1
1
0D400H
8K
1
0
0
0
0D800H
8K
1
0
0
1
0DC00H
8K
1
0
1
0
0C000H
32K
1
0
1
1
0C800H
32K
1
1
0
0
0D000H
32K
1
1
0
1
0D800H
32K
1
1
1
0
0C000H
64K
1
1
1
1
0D000H
64K
4
RES
RESERVED
This bit must be set low for normal operation
5
RES
RESERVED
This bit must be set high for normal operation
6
RES
RESERVED
This bit must be set low for normal operation
7
SOFEN
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
25



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