W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 73
![no-image](/images/no-image-200.jpg)
W83877
Manufacturer Part Number
W83877
Description
Winbond I/O
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83877.pdf
(125 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
W83877AF
Manufacturer:
INTEL
Quantity:
5 040
Company:
Part Number:
W83877F
Manufacturer:
Winbond
Quantity:
77
Company:
Part Number:
W83877F
Manufacturer:
WINBOND
Quantity:
147
Part Number:
W83877F
Manufacturer:
WINBOND/华邦
Quantity:
20 000
Part Number:
W83877TF
Manufacturer:
WINBOND/华邦
Quantity:
20 000
Company:
Part Number:
W83877TG
Manufacturer:
Nuvoton Technology Corporation of America
Quantity:
10 000
8.2.3 Configuration Register 2 (CR2), default = 00H
When the device is in Extended Function mode and EFIR is 02H, the CR2 register can be accessed
through EFDR. The bit definitions are as follows:
When the W83877F is programmed into extension adapter mode, the contents of this register are a
base address for the extension adapter. When base addresses EA3-EA9 are written into CR2, both
the
port can latch the same base address through pins XD1-XD7. After the base address is latched into
CR2, a subsequent read/write cycle to this same base address will generate an XRD or XWR signal.
If CEA is set to 0, then the W83877F will compare system addresses SA9-SA3 with EA9-EA3 to
generate a compare-equal signal for this read/write command to access the Extension adapter. If
CEA is set to 1, then only EA9-EA4 are used in this comparison.
XRD
0
1
and XWR pins will be active low simultaneously and an adapter connected to the parallel
Drives A and B assigned as usual
Drive A and drive B assignments exchanged
7
6
5
4
- 73 -
3
2
1
0
Publication Release Date: January 1996
CEA
EA3
EA4
EA5
EA6
EA7
EA8
EA9
W83877F
Revision A2