Register 0: SGMII Control Register - 3.5 English

Quad Serial Gigabit Media Independent LogiCORE Product Guide (PG029)

Document ID: PG029
Release Date: 2023-11-02
Version: 3.5 English

Management Registers Channel/Module 0

Figure 2-26: MDIO Register 0: SGMII Control Register Channel/Module 0
X-Ref Target - Figure 2-26

Table 2-28: SGMII Control Register Channel/Module 0 (Register 0)
Bits	Name	Description	Attributes	Default Value
0.15	Reset	1 = SGMII module 0 Reset 0 = Normal Operation	read/write self clearing	0
0.14	Reserved	Returns what is written	read/write	0
0.13	Speed Selection (LSB)	Always returns a 0 for this bit. Together with bit 0.6, speed selection of 1000 Mbps is identified.	returns 0	0
0.12	Auto-Negotiation Enable	1 = Enable SGMII Auto-Negotiation Process 0 = Disable SGMII Auto-Negotiation Process	read/write	1
0.11	Power Down	1 = Power down 0 = Normal operation When set to 1, the device-specific transceiver is placed in a low-power state. This bit requires a reset (see bit 0.15) to clear.	read/ write	0
0.10	Isolate	1 = Electrically Isolate SGMII logic from GMII 0 = Normal operation	read/write	1
0.9	Restart Auto-Negotiation	1 = Restart Auto-Negotiation Process across SGMII link 0 = Normal Operation	read/write self clearing	0
0.8	Duplex Mode	Always returns a 1 for this bit to signal Full-Duplex Mode.	returns 1	1
0.7	Collision Test	Always returns a 0 for this bit to disable COL test.	returns 0	0
0.6	Speed Selection (MSB)	Always returns a 1 for this bit. Together with bit 0.13, speed selection of 1000 Mbps is identified.	returns 1	1
0.5	Unidirectional Enable	Enable transmit regardless of whether a valid link has been established provided AN is disabled.	read/write	0
0.4:0.0	Reserved	Always return 0s, writes ignored.	returns 0s	00000

Management Registers Channels/Modules 1-3

Figure 2-27: MDIO Register 0: SGMII Control Channels/Modules 1-3
X-Ref Target - Figure 2-27

Table 2-29: SGMII Control Register Channels/Modules 1-3 (Register 0)
Bits	Name	Description	Attributes	Default Value
0.15	Reset	1 = SGMII module 1-3 Reset 0 = Normal Operation	read/write self clearing	0
0.14	Reserved	Returns what is written	read/write	0
0.13	Speed Selection (LSB)	Always returns a 0 for this bit. Together with bit 0.6, speed selection of 1000 Mbps is identified.	returns 0	0
0.12	Auto-Negotiation Enable	1 = Enable SGMII Auto-Negotiation Process 0 = Disable SGMII Auto-Negotiation Process	read/write	1
0.11	Reserved	Returns what is written	read/ write	0
0.10	Isolate	1 = Electrically Isolate SGMII logic from GMII 0 = Normal operation	read/write	1
0.9	Restart Auto- Negotiation	1 = Restart Auto-Negotiation Process across SGMII link 0 = Normal Operation	read/write self clearing	0
0.8	Duplex Mode	Always returns a 1 for this bit to signal Full-Duplex Mode	returns 1	1
0.7	Collision Test	Always returns a 0 for this bit to disable COL test	returns 0	0
0.6	Speed Selection (MSB)	Always returns a 1 for this bit. Together with bit 0.13, speed selection of 1,000 Mbps is identified.	returns 1	1
0.5	Unidirectional Enable	Enable transmit regardless of whether a valid link has been established provided AN is disabled	read/write	0
0.4:0.0	Reserved	Always return 0s, writes ignored	returns 0s	00000