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參數(shù)資料
| 型號： | RTL8208 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER |
| 中文描述： | 瑞昱單芯片八路10/100 Mbps快速以太網(wǎng)收發(fā)器 |
| 文件頁數(shù)： | 13/40頁 |
| 文件大?。?/td> | 546K |
| 代理商： | RTL8208 |
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RTL8208
2001/01/07
13
Rev.1.923
Reset
– In order to reset the RTL8208 by software control, a ‘1’ must be written to bit 15 using an SMI write operation. The bit
clears itself after the reset process is complete, and does not need to be cleared using a second SMI write. Writes to other Control
register bits will have no effect until the reset process is completed, which requires approximately 1us. Writing a ‘0’ to this bit
has no effect. Because this bit is self clearing after a few cycles from a write operation, it will return a ‘0’ when read.
Loopback
– The RTL8208 may be placed into loopback mode by writing a ‘1’ to bit 14. Loopback mode may be cleared either
by writing a ‘0’ to bit 14 or by resetting the chip. When this bit is read, it will return a ‘1’ when the chip is in software-controlled
loopback mode, otherwise it will return a ‘0’.
Speed Selection
– If Auto-negotiation is enabled, this bit has no effect on the speed selection. However, if Auto-negotiation is
disabled by software control, the operating speed of the RTL8208 can be forced by writing the appropriate value to bit 13.
Writing a ‘1’ to this bit forces 100Base-X operation, while writing a ‘0’ forces 10Base-T operation. When this bit is read, it
returns the value of the software controlled forced speed selection only.
Auto Negotiation Enable
– Default Auto Negotiation enable for all TP ports and disable for FX ports. Auto-negotiation can be
disabled by either software control to set 0.12=0.
Power Down
– The RTL8208 supports a low power mode which is intended to decrease power consumption. Writing a ‘1’ will
enable power down mode, and writing a ‘0’ will return the RTL8208 to normal operation. When read, this register will return a
‘1’ when in power down mode, and a ‘0’ during normal operation.
Isolate
– Each individual PHY may be isolated from its MII by writing a ‘1’ to bit 10. All MII outputs will be tri-stated and all
MII inputs will be ignored. Since the MII management interface is still active, the isolate mode may be cleared either by writing
a ‘0’ to bit 10 or by resetting the chip. When this bit is read, it will return a ‘1’ when the chip is in isolate mode, and a ‘0’ during
normal operation.
Restart Auto Negotiation
– Bit 9 is a self-clearing bit that allows the Auto-negotiation process to be restarted, regardless of the
current status of the Auto-negotiation state machine. In order for this bit to have an effect, Auto-negotiation must be enabled.
Writing a ‘1’ to this bit restarts Auto-negotiation while writing a ‘0’ to this bit has no effect. When this bit is read, it will always
return a ‘0’.
Duplex Mode
– By default, the RTL8208 powers up in half duplex mode. The chip can be forced into full duplex mode by
writing a ‘1’ to bit 8 while Auto-negotiation is disabled. Half duplex mode can be resumed either by writing a ‘0’ to bit 8 or by
resetting the chip. When Nway is enabled, this bit reflects the results of the Auto-negotiation, and is in a read only mode. When
Nway is disabled, this bit can be set through the SMI, and is in a read/write mode. When 100FX is enabled, this bit can be set
through the SMI or FX_DUPLEX pin and is in a read/write mode.
Reserved Bits
– All reserved MII register bits must be written as ‘0’ at all times. Ignore the RTL8208 output when these bits are
read.
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