Microchip Technology Microsemi UG0677 - Figure 27 PMA-Bus Waveform; Figure 28 PMA Only Data Path - 80-Bits

Functional Description
Microsemi Proprietary and Confidential UG0677 User Guide Revision 9.0 45
The PMA interface bypasses any PCS encoding and decoding logic and is used with customized PCS
functionality implemented in the FPGA fabric. The fabric-hosted soft-IP can be customer supplied or
soft-IP provided through 3rd-party of Microsemi direct cores. The transceiver PMA mode is useful in
supporting protocols such as SDI-HD. The PMA Only mode is also used for 1GbE interfaces. The
CoreTSE suite of 1GbE IPs contain a soft 8b10b encoder/decoder, which allows the use of either the
transceiver or the I/O CDR to implement this standard.
Figure 27 • PMA-Bus Waveform
Figure 28 • PMA Only Data Path – 80-bits
TX Data
b0 b1 b2 b38 b39
LANE#_TX_CLK
LANE#_TX_DATA
LANE#_TXD_PIN
TX
FWF
TX_DATA[79:0]
WID
CONV
80
80
Serializer
40
TXP, TXN
n is either 4 or 8, depending on configured serial speed
divide by 2
mux
n==8
n==4
Div40
TX_CLK
RX
FWF
RX_DATA[79:0]
WID
CONV
80
80
De-Serializer
40
RXP, RXN
divide by 2
mux
n==8
n==4
Div40
RX_CLK
Clocks appear in
colors. Data path is
black.
PMA
PCS- PMA Only-80bit
FPGA
Fabric
n is either 4 or 8, depending on configured serial speed