MOTOROLA
Chapter 3. Receiver
3-3
Receiver Interface Signals
“D.” Internal signals are not available at the I/O of the device, but are presented to illustrate
device operation.
Table 3-1. Receiver Interface Signals
Signal Name
Description
Function
Direction
Active
State
RECV_x_7 through
RECV_x_0
Received Byte
Received and decoded data/control
byte.
The least significant 8 bits of received
data in TBI mode.
Output
-
RECV_x_K
Special Data Indicator/
Received Bit 8
Indicates that received byte is a special
control byte.
Received bit 8 in TBI mode.
Errors are coded using this signal. See
Output
-
RECV_x_9
Received Bit 9
Received bit 9 in TBI mode. Unused in
8-bit mode.
Output
-
RECV_x_IDLE
Receiver Idle Detect
Indicates that the receiver detected an
Idle character (operates in Byte and TBI
modes).
Errors are coded using this signal. See
Output
-
RECV_x_ERR
Receiver Error
Indicates that the receiver detected an
error. RECV_x_IDLE and RECV_x_K
must be decoded to determine error
codes.
Output
-
RECV_x_CLK
Receiver Interface
Clock
Clock used for clocking receiver
interface. Source and frequency of this
clock depend on operating mode. See
Output
-
DROP_SYNC
Drop Synchronization
Indicates that the current byte and word
alignment should be invalidated and new
alignment acquired. DROP_SYNC is
level sensitive and not synchronized to a
clock, it must be asserted for at least two
clock periods.
Input
High
XCVR_x_DISABLE Transceiver Disable
Indicates that the transmitter and
receiver for this transceiver are disabled.
Input
High
XCVR_x_RSEL
Transceiver Link Select
Indicates that the redundant link inputs
are observed and that primary link
inputs are ignored.
Input
High
RECV_EQ_EN
Receive Equalization
Enable
Indicates that receiver equalization is
enabled and that high frequency gain is
applied to the received signal.
Input
High
TBIE
Ten-Bit Interface Enable Indicates that the receiver interface is in
ten-bit mode and that the 8B/10B
decoder is bypassed.
Input
High
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