LAN9313I-NZW SMSC, LAN9313I-NZW Datasheet - Page 99

• Manufacturer Part Number: LAN9313I-NZW
• Description: Ethernet ICs Three Port 10/100 Ethernet Switch
• Manufacturer: SMSC
• Type: Three Port Managed Ethernet Switchr

Specifications of LAN9313I-NZW

• Ethernet Connection Type: 10 Base-T, 100 Base-TX
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Switches
• Number Of Transceivers: 1
• Standard Supported: 802.3, 802.3u
• Data Rate: 10 Mbps, 100 Mbps
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): 0 V
• Supply Current (max): 155 mA, 270 mA
• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
SMSC LAN9313/LAN9313i
7.3.1.1
7.3.1.2
7.3.1.3
For example, if the full capabilities of the Virtual PHY are advertised (100Mbps, Full Duplex), and if
the link partner is capable of 10Mbps and 100Mbps, then auto-negotiation selects 100Mbps as the
highest performance mode. If the link partner is capable of half and full-duplex modes, then auto-
negotiation selects full-duplex as the highest performance operation. In the event that there are no bits
in common, an emulated
The
ability bits set. These values can be reconfigured via software. Once the auto-negotiation is complete,
any change to the
affect until the auto-negotiation process is re-run. The emulated link partner default advertised abilities
i n t h e
(VPHY_AN_LP_BASE_ABILITY)
and speed_strap_mii configuration straps as described in
Auto-Negotiation Link Partner Base Page Ability Register (VPHY_AN_LP_BASE_ABILITY)," on
page
faults, or 100BASE-T4.
Note: The MII_DUPLEX, duplex_pol_strap_mii, and speed_strap_mii inputs are considered to be
If there is at least one common selection between the emulated link partner and the Virtual PHY
advertised abilities, then the auto-negotiation succeeds, the Link Partner Auto-Negotiation Able bit 0
of the
ability bits in the
(VPHY_AN_LP_BASE_ABILITY)
Note: For the Virtual PHY, the auto-negotiation register bits (and management of such) are used by
Parallel Detection
In the event that there are no common bits between the advertised ability and the emulated link
partners ability, auto-negotiation fails and emulated parallel detect is used. In this case, the Link
Partner Auto-Negotiation Able (bit 0) in the
(VPHY_AN_EXP)
by the speed_strap_mii configuration strap. Only one of the technology ability bits in the
Auto-Negotiation Link Partner Base Page Ability Register (VPHY_AN_LP_BASE_ABILITY)
indicating the emulated parallel detect result.
Disabling Auto-Negotiation
Auto-negotiation can be disabled in the Virtual PHY by clearing bit 12 (VPHY_AN) of the
Basic Control Register
to reflect the speed (bit 13) and duplex (bit 8) of the
(VPHY_BASIC_CTRL). The speed and duplex bits in the
(VPHY_BASIC_CTRL)
Virtual PHY Pause Flow Control
The Virtual PHY supports pause flow control per the IEEE 802.3 specification. The Virtual PHYs
advertised pause flow control abilities are set via bits 10 (Symmetric Pause) and 11 (Asymmetric
Pause) of the
Virtual PHY to advertise its flow control abilities and auto-negotiate the flow control settings with the
100Mbps Full Duplex (highest priority)
100Mbps Half Duplex
10Mbps Full Duplex
10Mbps Half Duplex (lowest priority)
Virtual PHY Auto-Negotiation Advertisement Register (VPHY_AN_ADV)
218. Neither the Virtual PHY or the emulated link partner support next page capability, remote
Virtual PHY Auto-Negotiation Expansion Register (VPHY_AN_EXP)
static. Auto-negotiation is not automatically re-evaluated if these inputs are changed.
the PMI. So the perception of local and link partner is reversed. The local device is the PMI,
while the link partner is the switch fabric. This is consistent with the intention of the Virtual PHY.
V i r t u a l P H Y A u t o - N e g o t i a t i o n L i n k P a r t n e r B a s e P a g e A b i l i t y R e g i s t e r
Virtual PHY Auto-Negotiation Advertisement Register
Virtual PHY Auto-Negotiation Advertisement Register (VPHY_AN_ADV)
will be cleared, and the communication set to half-duplex. The speed is determined
Virtual PHY Auto-Negotiation Link Partner Base Page Ability Register
should be ignored when auto-negotiation is enabled.
(VPHY_BASIC_CTRL). The Virtual PHY will then force its speed of operation
Parallel Detection
are dependant on the MII_DUPLEX pin and the duplex_pol_strap_mii
are set to indicate the emulated link partners abilities.
DATASHEET
99
is used.
Virtual PHY Auto-Negotiation Expansion Register
Table 13.6
Virtual PHY Basic Control Register
Virtual PHY Basic Control Register
(VPHY_AN_ADV). This allows the
of
Section 13.1.7.6, "Virtual PHY
is set, and the technology
defaults to having all four
Revision 1.7 (06-29-10)
Virtual PHY
will not take
Virtual PHY
will be set,