MOTOROLA
Chapter 4. Management Interface (MDIO)
4-11
MDIO Registers
4.2.10 MDIO RA 17 (Vendor Specific)—Channel Configuration
and Status Register
MDIO RA 17 contains the MC92603 channel configuration and status register. These bits
are initially loaded on power up from the corresponding states of the external MC92603
configuration input pins. They may be modified through the MDIO interface. It is not
necessary to reset the device logic if these bits are modified. Figure 4-9 shows the content
of register 17.
Table 4-7 lists the corresponding field descriptions for the channel configuration and status
register.
15
14
13
12
11
10
9
8
R
m_xcvr_
disable
i_xcvr_
disable
overrun
underrun an_mode
recv_clk_cent
broadcast_
mode
xcvr_x_rsel
W
Reset
0
XCVR_x_
DISABLE
0
0
0
RECV_CLK_
CENT
BROADCAST
XCVR_x_
RSEL
7
6
5
4
3
2
1
0
R
Receiver Error Counter
W
Reset
0
0
0
0
0
0
0
0
Figure 4-9. Channel Configuration and Status Register (MDIO RA 17)
Table 4-7. Channel Configuration and Status Register Field Descriptions
Bits
Name
Description
1
15
m_xcvr_disable
Initialized to zero. May be written through the MDIO interface. A software disable, when
set indicates that channel is to be disabled to reduce power. The channel is disabled if
either bit 15 or 14 are set. (R/W)
14
i_xcvr_x_disable
Contains the value of the XCVR_x_DISABLE input. (R)
13
overrun
Bit 13 is initialized to zero and then is set to one only if this channel ‘overruns’ due to clock
mismatch between the transmitter and receiver. Once set this bit is ‘sticky.’ That is, it
remains set until register 17 is read through the MDIO interface. This bit may not be
written through the MDIO interface. (R, LH, SC)
12
underrun
Bit 12 is initialized to zero and then is set to one only if this channel ‘underrun’ due to clock
mismatch between the transmitter and receiver. Once set this bit is ‘sticky.’ That is, it
remains set until register 17 is read through the MDIO interface. This bit may not be
written through the MDIO interface. (R, LH, SC)
11
an_mode
Initialized to zero. This bit is set whenever this channel’s transmitter is in the
auto-negotiation mode. This bit may not be written through the MDIO interface. (R)
10
recv_clk_cent
Initialized to RECV_CLK_CENT input. May be written through the MDIO interface. If set,
indicates that data out of the receiver is centered relative to the RECV_x_RCLK output.
(R/W)
Summary of Contents for MC92603
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