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Lattice Semiconductor
Figure 1. 1GbE PCS Solution
ORT42G5 Device
Embedded
ASB Section
1GbE PCS IP Core User’s Guide
Programmable Array Section
ort42g5_inf
pcs_1g_core
PLL
tx/rx
clocks
SERDES
8b/10b
tx_sync
tx_sm
1G Line
Systembus
of
ORT42G5
(ASB)
umi
Optional
autoneg
Optional
Management
Interface
MDIO
or MAC
interface
rx_sync_sm
rx_sync_sm
rx_sync_cc
rx_sm
Optional
gmii_mac_inf
GMII or
MAC
Interface
125MHz
Note: Optional interfaces are not needed if an Ethernet MAC Interfafce is present on-chip
Functional Description
The major blocks in the 1GbE PCS core are shown in Figure 1. Descriptions of these blocks follow.
Transmit Section
This section implements the Transmit State Machine which is speci?ed by Figures 36-5 and 36-6 in Clause 36 of
the IEEE 802.3-2002 Standard.
The PCS Transmit process continuously generates code-groups based upon the TXD <7:0> , TX_EN and TX_ER
signals on the GMII, sending them immediately to the Line Interface. The PCS Transmit process monitors the Auto-
negotiation process transmit ?ag to determine whether to transmit data or recon?gure the link.
Receive Section
Receive Synchronization State Machine
This module implements the synchronization state machine which is speci?ed by the Figure 36-9 of the IEEE
802.3-2002 Standard.
The Synchronization process is responsible for determining whether the underlying receive channel is ready for
operation. The process continuously accepts code-groups from the Line Interface and scans them to detect the
acquisition and maintenance of code group synchronization. This state machine also sets the sync_status ?ag
which is monitored by the receive state machine.
Receive State Machine
This module implements the receive state machine, which is speci?ed by Figures 36-7a and 36-7b in Clause 36 of
the IEEE 802.3-2002 Standard.
The PCS Receive process continuously accepts and monitors code-groups from the Line Interface and generates
RXD <7:0> , RX_DV and RX_ER on the GMII, and the internal receiving ?ag used by the Carrier Sense and Trans-
mit processes.
Auto-negotiation
This module implements the Auto-negotiation state machine, which is speci?ed by the Figure 37-6 in Clause 37 of
the IEEE 802.3-2002 Standard.
3
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