GBE-PCS-PM-U1 データシートの表示（PDF） - Lattice Semiconductor
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GBE-PCS-PM-U1 Datasheet PDF : 17 Pages
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Lattice Semiconductor
Gigabit Ethernet PCS IP Core
for LatticeECP2M
Figure 4. Typical Receive Timing Diagram
rx_kcntl
rx_data IDLE SPD preamble SFD Dest Add
Src Add Len/Type
Data
FCS EPD IDLE
rx_dv
rx_d
preamble SFD Dest Add
Src Add Len/Type
Data
FCS
Auto-Negotiation State Machine
The auto-negotiation state machine implements the link configuration functions described in clause 37 of IEEE
802.3 specification, including checking link readiness, determining duplex mode, and negotiating flow control. A
typical timing diagram is shown below.
Figure 5. Typical Auto-Negotiation Timing Diagram
power up reset
mr_page_rx
mr_an_complete
mr_adv_ability
0x0020
mr_lp_adv_ability
0x0000
0x4020
Signal Descriptions
Table 1. GbE PCS IP Core Input and Output Signals
Signal Name
Clock Signals
tx_clk_125
rx_clk_125
GMII Signals
I/O
Description
Transmit Clock – 125 MHz clock source for transmit state machine. Incoming GMII
In transmit data is sampled on rising edge of this clock. Outgoing 8-bit code group trans-
mit data is launched on the rising edge of this clock.
Receive Clock – 125 MHz clock source for receive state machine and the synchroni-
In zation state machine. Incoming signals are sampled on the rising edge of the clock.
Outgoing signals are launched on the rising edge of this clock.
tx_d[7:0]
tx_en
tx_er
rx_d[7:0]
rx_dv
rx_er
8-Bit Code Group Signals
tx_data[7:0]
tx_kcntl
In Transmit Data – Incoming GMII data.
In Transmit Enable – Active high signal, asserts when incoming data is valid.
In
Transmit Error – Active high signal, used to denote transmission errors and carrier
extension on incoming GMII data port.
Out Receive Data – Outgoing GMII data.
Out Receive Data Valid – Active high signal, asserts when outgoing data is valid.
Out
Receive Error – Active high signal, used to denote transmission errors and carrier
extension on outgoing GMII data port.
Out
8b Transmit Data – 8-bit code group data after passing through transmit state
machine.
Out
8b Transmit K Control – Denotes whether current code group is data or control.
1=control 0=data
4
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