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參數(shù)資料
| 型號： | W89C880F |
| 英文描述： | LAN Hub Controller |
| 中文描述： | 局域網(wǎng)集線器控制器 |
| 文件頁數(shù)： | 49/72頁 |
| 文件大?。?/td> | 731K |
| 代理商： | W89C880F |
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W89C840F
Publication Release Date:April 1997
Revision A1
- 49 -
16
R/W
MDC
MII Management Port Clock.
The state of the MDC
i s
directly
put
on the MIMDC pin for
providing the MII management clock. To generate this clock
source, the MDC should be programmed as 1 and 0 with equal duty
cycle and timing width alternately. The AC timing specification
with respect to the MIMDC and MIMDIO should follow the media
independent interface(MII) specification defined in IEEE 802.3u.
15
R
---
Reserved. Fixed at 0.
14
R/W
RDCTL
BootROM Read Control.
When EESEL(bit 11 in this register) is reset, setting this bit will
perform the on-board boot ROM read operation with the reading
address specified by the register C28/CBROA. The one byte data
read from the on-board boot ROM
i s
latched into the bits field
EEBRD[7:0] of this register.
The bit RDCTL
i s
cleared automatically after BootROM read
operation is completed.
The RDCTL will not allow set
ti ng
high, even writing a logic 1 to
RDCTL if the bit EESEL(bit 11 in this register) is set.
13
R/W
WRCTL
BootROM Write Control.
When
bit EESEL (bit 11) is reset, setting this bit will trigger the
W89C840F to perform the on-board boot ROM write operation with
the writing address specified by the register C28/CBROA. The one
byte write data
i s
latched by the EEBRD[7:0] before setting the
WRCTL high.
This bit will be cleared automatically if BootROM write operation is
completed.
The WRCTL will not allow
setti ng
high, even writing a logic 1 to
WRCTL if the bit EESEL(bit 11 in this register) is set.
12
R
---
Reserved. Fixed at 0.
11
R/W
EESEL
EEPROM/BootROM Select
The onb
oard boot ROM read/write function through CMIIR will be
enabled if reset EESEL.
Oherw se, on
board boot ROM access
f
uncti on i s di sabl ed and
CMIIR will be used to access the
onboard EEPROM
devi ce i f set
EESEL high.
10:8
R
---
Reserved. Fixed at 0.
7:4
R/W
EEBRD
[7:4]
EEPROM/Boot ROM Data 4 to 7:
The EEBRD[7:4] are used to store the read/write data for the on
board boot ROM access when EESEL is reset to low.
The data of EE
BRD[7: 4] i s of no mani ng i f set
EESEL
high.
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