Microchip Technology Microsemi UG0677 - PMA Only; Figure 25 Initial Receiver Detection for Receiver-Present; Figure 26 Subsequent Receiver Detection Where Prior Status was Receiver-Not-Present

Functional Description
Microsemi Proprietary and Confidential UG0677 User Guide Revision 9.0 44
The following figure shows how the soft PIPE interface signals behave when the first detection finds a
connected receiver. The difference between receiver presence and absence is the value of RxStatus in
simulation, but in real silicon, the delay to the PhyStatus pulse can be different. In real silicon, the
Receiver-Not-Present response occurs earlier than a Receiver-Present response.
Figure 25 • Initial Receiver Detection For Receiver-Present
The following figure shows how PIPE interface responds to a successive receiver detection when the
prior detection result is Receiver-Not-Present.
Figure 26 • Subsequent Receiver Detection Where Prior Status Was Receiver-Not-Present
3.3.5 PMA Only
This interface uses the transceiver PMA as a conduit to receive and transmit data to or from the fabric
boundary. Serial data is deserialized and sent to the receive FWF before the data is sent to the parallel
FPGA fabric bus. Similarly, parallel data from the fabric goes through a transmit FWF prior to entering the
parallel interface of the serializer.
The following features are supported in the PMA only mode:
• Flexible PMA interface width options of [8, 10, 16, 20, 32, 40] bits.
• Flexible fabric interface width options of [8, 10, 16, 20, 32, 40, 64, 80] bits per clock beat.
• Fabric control of CDR bit-slip for optional symbol alignment purposes.
• Fabric control of transmitter electrical-idle.
• Fabric control override of CDR lock behavior enabling Burst Mode Receiver support.
• Fabric side interface for transmitter operates at half the frequency of the transmit PMA interface.
• Fabric side interface for receiver operates at half the frequency of the receiver PMA interface.
PCLK
TxDetectRx
P1 (2'b01)
PowerDown
PhyStatus
RxStatus
3'b000 3'b011 3'b000
Simulation: Approximately 3.4 μs
Reality: 2 to 5 μs
PCLK
TxDetectRx
P1 (2'b01)
PowerDown
PhyStatus
RxStatus
3'b000
Oscillating PhyStatus from prior Receiver-Not-Present
detection terminates this detection with same status in
one PCLK cycle.
Oscillation ends once
internal detect
operation begins.