lxt9785 Intel Corporation, lxt9785 Datasheet - Page 121

• Manufacturer Part Number: lxt9785
• Description: Advanced 8-port 10/100 Mbps Phy Transceivers
• Manufacturer: Intel Corporation

4.3.8
4.3.9
Datasheet
Document Number: 249241
Revision Number: 007
Revision Date: August 28, 2003
Figure 11. Intel
Note: The BGA15 package does not support the MII sectionalization feature.
MII Sectionalization
When sectionalized into two quad sections, the MDIO bus splits into two separate PHY access
ports. Ports 0-3 of the MDIO section operate independently of ports 4-7. The MII isolate function
is unaffected and operates normally. Sectionalization is selected by pulling pin 176 (Section) High
on the initial power-up sequence (refer to
such as 1x8 and 2x4 and have a single MDIO bus structure, it is necessary that the addressing
scheme be contiguous. For example, the first eight ports are addressed 0-7, so the next four ports
must be addressed 8-11.
MII Interrupts
The LXT9785/LXT9785E provides a single per-section interrupt pin that is available to all ports.
Interrupt logic is shown in
interrupt registers for each port. Register 18 provides interrupt enable and mask functions and
Register 19 provides interrupt status. Setting Register bit 18.1 = 1 enables a port to request
interrupt via the MDINT pin. An active Low on this pin indicates a status change on the device.
Because it is a shared interrupt, there is no indication which port is requesting interrupt service (see
Figure
There are five conditions that may cause an interrupt:
®
12).
LXT9785/LXT9785E Port Address Scheme
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
Figure
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LXT9785
LXT9785/9785E
Port 0
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Port 6
Port 3
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Port 5
Port 7
12. The LXT9785/LXT9785E also provides two dedicated
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BASE ADD_<4:0>
(example ADD_<4:0> = 4)
Figure
PHY ADD_<4:0> (BASE+0)
ex. 4
PHY ADD_<4:0> (BASE+1)
ex. 5
PHY ADD_<4:0> (BASE+2)
ex. 6
PHY ADD_<4:0> (BASE+3)
ex. 7
PHY ADD_<4:0> (BASE+4)
ex. 8
PHY ADD_<4:0> (BASE+5)
ex. 9
PHY ADD_<4:0> (BASE+7)
ex. 11
PHY ADD_<4:0> (BASE+6)
ex. 10
13). In applications that need sectionalization,
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