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MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
Transmitter Interface Configuration
2.3
Transmitter Interface Configuration
The transmitter may operate in one of eight data interface configurations as shown in
Table 2-2. The compatibility configuration pin, COMPAT, establishes operation in either
the backplane applications mode or the Ethernet compatible mode. The 10-bit interface
enable, TBIE, configuration input, determines if the internal 8B/10B encoder will be used
with uncoded input data or bypassed for a pre-encoded (coded) input data. When the DDR
configuration pin is enabled, it reduces the interface from an 8-/10-bit single data rate
interface to a 4-/5-bit double data rate interface.
The configuration signals, COMPAT and TBIE, also affect the receiver’s configuration.
XCVR_x_RSEL
Select redundant link
Transmit data on the secondary (redundant)
link
Input
High
TST_1, TST_0
Test mode config inputs
Decoded to define various test modes (see
Chapter 6, “Test Features,” for details)
Input
—
MEDIA
Media impedance select
Indicates the impedance of the transmission
media. Low indicates 50
Ω
and high indicates
75
Ω
.
Input
—
XLINK_x_N/
XLINK_x_P
Link serial transmit data
Differential serial transmit data output pads
Output
—
Internal Signals
rx_clock
High-speed transceiver
clock
Internal, differential high speed clock used to
transmit and receive link data
Input
—
repeat_data
Received repeat data
Repeater mode, received data to re-transmit
Input
—
loop_back_data
Loopback data
Differential loopback transmit data
Output
—
auto_neg_enable
Auto-negotiation enable
Auto-negotiate is enabled if this signal is high
and in GMII mode
Input
High
Table 2-2. MC92603 Data Interface Modes
Data Interface Mode
COMPAT
TBIE
DDR
Backplane 8-bit uncoded data
Low
Low
Low
Backplane (4-bit reduced interface) uncoded data
Low
Low
High
Backplane 10-bit coded data
Low
High
Low
Backplane (5-bit reduced interface) coded data
Low
High
High
Ethernet compatible GMII
High
Low
Low
Ethernet compatible RGMII
High
Low
High
Ethernet compatible TBI
High
High
Low
Ethernet compatible RTBI
High
High
High
Table 2-1. MC92603 Transmitter Interface Signals (continued)
Signal Name
Description
Function
Direction
Active
State
Summary of Contents for MC92603
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