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參數(shù)資料
| 型號(hào)： | W83877 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | WINBOND I/O |
| 中文描述： | 華邦的I / O |
| 文件頁(yè)數(shù)： | 106/191頁(yè) |
| 文件大小： | 1200K |
| 代理商： | W83877 |
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W83877ATF
Publication Release Date: April 1998
- 102 -
Version 0.51
8.0 EXTENDED FUNCTION REGISTERS
The W83877ATF provides many configuration registers for setting up different types of
configurations. After power-on reset, the state of the hardware setting of each pin will be latched by
the relevant configuration register to allow the W83877ATF to enter the proper operating
configuration. To protect the chip from invalid reads or writes, the configuration registers cannot be
accessed by the user.
There are four ways to enable the configuration registers to be read or written. HEFERE (CR0C bit 5)
and HEFRAS (CR16 bit 0) can be used to select one out of these four methods of entering the
Extended Function mode
,
as follows:
HEFRAS
HEFERE
address and value
0
0
write 88H to the location 250H
0
1
write 89H to the location 250H (power-on default)
1
0
write 86H to the location 3F0H twice
1
1
write 87H to the location 3F0H twice
First, a specific value must be written once (88H/89H) or twice (86H/87H) to the Extended Functions
Enable Register (I/O port address 250H or 3F0H). Second, an index value (00H-19H, 20H-29H, 2CH-
2DH, 31H-3AH, 40H-45H) must be written to the Extended Functions Index Register (I/O port address
251H or 3F0H) to identify which configuration register is to be accessed. The designer can then
access the desired configuration register through the Extended Functions Data Register (I/O port
address 252H or 3F1H).
After programming of the configuration register is finished, an additional value should be written to
EFERs to exit the Extended Function mode, to prevent unintentional access to those configuration
registers. In the case of EFER at 250H, this additional value can be any value other than 88H if
HEFERE = 0 and 89H if HEFERE = 1. While EFER is at 3F0H, this additional value must be AAH.
The designer can also set bit 6 of CR9 (LOCKREG) to high to protect the configuration registers
against accidental accesses.
The configuration registers can be reset to their default or hardware settings only by a cold reset (pin
MR = 1). A warm reset will not affect the configuration registers.
8.1 Extended Functions Enable Registers (EFERs)
After a power-on reset, the W83877ATF enters the default operating mode. Before the W83877ATF
enters the extended function mode, a specific value must be programmed into the Extended Function
Enable Register (EFER) so that the extended function register can be accessed. The Extended
Function Enable Registers are write-only registers. On a PC/AT system, their port addresses are
250H or 3F0H (as described in the above section).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W83877F | WINBOND I/O |
| W83877TD | I/O chip disk drive adapter |
| W83877TF | Multi-Function I/O Port Controller(用于個(gè)人計(jì)算機(jī)的多功能輸入/輸出口控制器) |
| W83971D | AC97 AUDIO CODEC |
| W83977AF | PLUG & PLAY 1.0A COMPLIANT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W83877AD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral (Multifunction) Controller |
| W83877AF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral (Multifunction) Controller |
| W83877ATD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:enhanced version from Winbonds most popular I/O chip W83877F |
| W83877ATF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:enhanced version from Winbonds most popular I/O chip W83877F |
| W83877F | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O |
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