HC4GX15 Datasheet, PDF (447/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 1: HardCopy IV GX Transceiver Architecture
Functional Modes
1–183
Basic (PMA-Direct) Functional Mode
In Basic (PMA-Direct) functional mode, the HardCopy IV GX transceiver datapath
contains only PMA blocks. Parallel data is transferred directly between the core fabric
and the serializer/deserializer inside the transmitter/receiver PMA. Because all PCS
blocks are bypassed in Basic (PMA Direct) mode, you must implement the required
PCS logic in the core fabric.
You can configure four regular transceiver channels inside each transceiver block in
Basic (PMA-Direct) functional mode. Two CMU channels inside each transceiver
block can be configured only in Basic (PMA-Direct) functional mode, as they do not
support PCS circuitry.
In PMA-Direct mode, you must create your own logic to support PCS functionality.
There are specific reset sequences to be followed in this mode.
Use dynamic reconfiguration to dynamically reconfigure the various PMA controls to
tailor the transceivers in PMA direct drive mode for a particular application.
f For more information, refer to the HardCopy IV GX Dynamic Reconfiguration chapter in
volume 3 of the HardCopy IV Device Handbook.
The term ‘PMA-Direct’ is used to describe various configurations in this mode.
1 In Basic PMA-Direct mode, all the PCS blocks are bypassed; therefore, any PCS-type
features (such as the phase comp FIFOs, byte serializer, 8B/10B encoder/decoder,
word aligner, deskew FIFO, rate match FIFO, byte deserializer, and byte ordering),
must be implemented in the core fabric. In Basic PMA-Direct mode, you must create
your own logic to support PCS functionality.
Figure 1–153 shows the HardCopy IV GX transceiver configured in Basic
(PMA-Direct) functional mode. The grayed out blocks indicate areas that are not
active in this mode.
Figure 1–153. HardCopy IV GX Transceiver Configured in Basic (PMA-Direct) Mode
TX Phase
Compensation
FIFO
Transmitter Channel PCS
Byte
Serializer
8B/10B
Encoder
Transmitter Channel PMA
Serializer
Core
Fabric
PCI
Express
Hard IP
PIPE
Interface
RX Phase
Compensation
FIFO
Receiver Channel PCS
Byte
De-
serializer
8B/10B
Decoder
Rate
Match
FIFO
Word
Aligner
Receiver Channel PMA
De-
serializer
CDR
Note to Figure 1–153:
(1) The grayed out blocks shown in Figure 1–153 are not available in the CMU channels. Therefore, the CMU channels can be configured to operate
as transceiver channels in PMA direct mode only.
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3