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MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
Backplane Applications Modes (COMPAT = Low)
The RECV_x_K is asserted high when the receiver is in an error state. When RECV_x_K
is high, the state of the RECV_x_7–RECV_x_0 signals are decoded to determine the error
condition.
The receiver interface is timed to the clock output, RECV_x_RCLK.
3.8.2.1
Double Data Rate Operation—Backplane Applications
When configured for backplane applications (COMPAT = low), double data rate operation
(DDR high) is functionally identical to the previously mentioned receiver operating modes.
The difference is only at the chip parallel data interfaces. Data outputs are shared and
defined uniquely depending for each phase of the output clock (RECV_x_RCLK).
The double data rate interfaces for receiving uncoded or coded data are shown in Table 3-17
and Table 3-18, respectively.
Table 3-16. Receiver Interface Error and Status Codes
(Backplane 10-Bit Mode)
RECV_x_
K
RECV_x_
COMMA
RECV_x_
ERR
RECV_x_
DV
RECV_x_
[7:0]
Priority
1
1
The priority column shows the error that is reported if multiple errors occur at the same time. The lower priority
numbered errors are reported first.
Description
Low
Low
Data[9]
Data[8]
Data[7:0]
6
Normal operation, non-COMMA code
group received.
Low
High
Data[9]
Data[8]
Data[7:0]
5
Normal operation, COMMA (K28.1,
K28.5, or K28.7) code group received.
High
Don’t care
Don’t care
Don’t care
0x04
3
Overrun
High
Don’t care
Don’t care
Don’t care
0x02
3
Underrun
High
Don’t care
Don’t care
Don’t care
0x01
2
Not word sync: The receiver is in
start-up or has lost word alignment
and is searching for alignment.
High
Don’t care
Don’t care
Don’t care
0x00
1
Not byte sync: The receiver is in
start-up or has lost byte alignment and
is searching for alignment.
Table 3-17. DDR Backplane Uncoded Data (8-Bit Mode)
Clock Edge
RECV_x_K
RECV_x_COMMA
RECV_x_DV
RECV_x_[3:0]
Rising
RECV_x_K
RECV_x_COMMA
RECV_x_DV
Data bit [3:0]
Falling
RECV_x_K
RECV_x_COMMA
RECV_x_ERR (XOR)
RECV_x_DV
Data bit [7:4]
Table 3-18. DDR Backplane Coded Data (10-Bit Mode)
Clock Edge
RECV_x_K
RECV_x_COMMA
RECV_x_DV
RECV_x_[3:0]
Rising
RECV_x_K
RECV_x_COMMA
Data bit 4
Data bit [3:0]
Falling
RECV_x_K
RECV_x_COMMA
Data bit 9
Data bit [8:5]
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