w89c840af Winbond Electronics Corp America, w89c840af Datasheet - Page 64

• Manufacturer Part Number: w89c840af
• Description: 100/10mbps Ethernet Controller
• Manufacturer: Winbond Electronics Corp America

The C44/CPA1 defines the last 16 bits of the 48 bits MAC address. The CPA1 value is loaded from EEPROM after
hardware reset
C48/CBRCR Boot ROM Size Configuration Register
This register is used to configure the size of the boot ROM. The bit 0 to bit 2 of the register C48/CBRCR are loaded
form the external EEPROM after the deasserted of the hardware reset. The configuration of the BPS[2:0] will affect
the return value from the register F30/FERBA to determine how large the expansion memory space the on-board
boot ROM needs when it is read by the power-on software.
Bit
31:16
15:8
7:0
Bit
31:3
2:0
Attribute
R
R/W
R/W
Attribute
R
R/W
Bit name
---
PAR5
PAR4
Bit name
---
BPS[2:0]
Description
Reserved. Fixed at 0.
Physical Address 5.
The PAR5 defines the 40~47 bit of the 48 bit of the MAC address.
Physical Address 4.
The PAR0 defines the 32~39 bit of the 48 bit of the MAC address.
Description
Reserved. Fixed at 0.
Boot ROM Size Select.
The size of the on board boot ROM device is selected by BPS[2:0]
as follows.
BPS2 BPS1 BPS0
-------------------------
0
0
0
1
1
1
1
0
1
1
0
0
1
1
-64 -
X
0
1
0
1
0
1
No Boot ROM
8K
16K
32K
64K
128K
256K
Publication Release Date:October 2000
Revision 1.01
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Size
W89C840AF