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參數(shù)資料
| 型號： | MB86967PFV |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP100 |
| 封裝： | PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 67/129頁 |
| 文件大?。?/td> | 1519K |
| 代理商： | MB86967PFV |
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42
MB86967
(5) DLCR4: Transmit Mode Register
DLCR4 sets the transmitter operation modes, and displays the count of collision occurrence.
* : These bits are undefined until the first packet is completely transmitted after power-on.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Read
COL3
COL2
COL1
COL0
TST1
CNTRL
LBC
DSC
Write
———
—
0
Initial Value
0*
0
1
0
Bit no.
Bit name
Operation
Value
Function
7 to 4
COL3 to COL0
(Collision
Count)
Read
—
Displays count of collision until transmission completed.
These bits are cleared at the completion of transmission.
3
TST1
(Chip Test 1)
Read/Write
—
This is a chip test bit. Always write 0 to this bit at writing to
DLCR4. 1 cannot be written to this bit during normal
operation.
2
CNTRL
(DREQ Control)
Read/Write
0
The DREQ signal is negated in the
last cycle of DMA transfer.
* : This bit is invalid in the
PC card mode.
1
The DREQ signal is negated two
cycles before the last cycle of DMA
transfer.
1
LBC
(Loopback
Control)
Read/Write
0
Forced to enter loopback mode.
The loopback is not canceled even when a collision is
detected. Transmit data is not output from the TPOP*/TPON*
pin.
1
Enters standard loopback mode specified in 10BASE-T
standard.
The loopback function works only at data transmission. The
transmit data is loopbacked to the receiver by the encoder/
decoder.
If the MB86967 is in the link fail and jabber states when a
collision is detected, the loopback mode is canceled and
signals are accepted from the twisted-pair input.
0
DSC
(Disable
Carrier Detect)
Read/Write
—
When this bit is set to 1, the MB86967 is enabled for duplex
transmission. In this case, data can be transmitted
irrespective of the state of the receiver, enabling external
loopback operation.
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