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參數(shù)資料
| 型號： | RTL8305S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 5-PORT 10/100 MBPS SINGLE CHIP SWITCH CONTROLLER |
| 中文描述： | 5端口10/100 Mbps單片開關(guān)控制器 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 417K |
| 代理商： | RTL8305S |
RTL8305S
2002/02/19
Rev. 1.2
16
6.5.2 MII/SNI PHY Mode
In routing applications, the RTL8305S cooperates with a routing engine to communicate with a WAN (Wide Area Network)
through MII/SNI. In such applications, P4LNKSTA# =0 and P4MODE[1] are pulled low upon power-on reset. P4MODE[0]
determines whether MII or SNI mode is selected. In MII (nibble) mode (P4MODE[0]=1), P4SPDSTA# =0 results in MII
operating at 100Mbps with MTXC and MRXC running at 25MHz; however, P4SPDSTA#=1 leads to MII operating at 10Mbps
with MTXC and MRXC running at 2.5MHz. In SNI (serial) mode (P4MODE[0]=0), P4SPDSTA# has no effect and must be
floating. SNI mode operates at 10Mbps only, with MTXC and MRXC running at 10MHz. In SNI mode, RTL8305S does not
loopback RXDV signals as a response to TXEN and does not support heart-beat functions (asserting the COL signal for each
complete TXEN signal).
By pulling-up ENP4LED (internal default =1), the RTL8305S displays the MII/SNI status through LEDs of port 4, such as
activity/link, collision/duplex, and speed.
6.5.3 MII MAC Mode
In HomePNA/100Base-FX applications, the RTL8305S provides the MII interface to the underlying HomePNA or
100Base-FX related physical devices to communicate with other types of LAN medium. In such applications, P4MODE[1] is
pulled high upon power-on reset and the RTL8305S supports the UTP/MII auto-detection function. When both UTP and MII
are active (link on), the UTP port has a higher priority over the MII port. In HomePNA applications, P4SPDSTA# must be
floating and, since HomePNA is half-duplex only, P4DPXSTA# should be floating as well. It is recommend to pull
P4LNKSTA# low instead of being wired to the LINK LED pin of the HomePHY because of the unstable link state of the
HomePHY configuration, which is a characteristic based on the HomePNA 1.0 standard. For 100Base-FX applications,
P4LNKSTA# =0, P4SPDSTA# =0 and P4DPXSTA# depends on the application.
By pulling-up ENP4LED (internal default =1), the RTL8305S displays the MII status through the LEDs of port 4, such as
activity/link, collision/duplex, and speed. Pin SEL_MIIMAC# can be used to indicate that the MII MAC port is active by a
LED for the sake of UTP/MII auto-detection. Finally, a 25MHz clock output (CK25MOUT) can be used as a clock source for
the underlying HomePHY/100Base-FX physical devices.
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