lan9215 Standard Microsystems Corp., lan9215 Datasheet - Page 44

• Manufacturer Part Number: lan9215
• Description: Lan9215 16-bit Non-pci 10/100 Ethernet Controller With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Revision 2.3 (08-06-08)
3.9.3.2
3.10
PHY REG 0.15
SOURCE
RESET
PHY_RST
nRESET
SRST
POR
Energy Detect Power-Down
This power-down mode is activated by setting the Phy register bit 17.13 to 1. Please refer to
5.5.8, "Mode Control/Status," on page 116
no energy is present on the line, the PHY is powered down, with the exception of the management
interface, the SQUELCH circuit and the ENERGYON logic. The ENERGYON logic is used to detect
the presence of valid energy from 100Base-TX, 10Base-T, or Auto-negotiation signals
In this mode, when the ENERGYON signal is low, the PHY is powered-down, and nothing is
transmitted. When energy is received - link pulses or packets - the ENERGYON signal goes high, and
the PHY powers-up. It automatically resets itself into the state it had prior to power-down, and asserts
the INT7.1 bit of the register defined in
ENERGYON interrupt is enabled, this event will cause an interrupt to the host. The first and possibly
the second packet to activate ENERGYON may be lost. When 17.13 is low, energy detect power-down
is disabled.
The LAN9215 has five reset sources:
Table 3.10
Note 3.11 After any PHY reset, the application must wait until the “Link Status” bit in the PHY’s “Basic
Note 3.12 After a POR, nRESET or SRST, the LAN9215 will automatically check for the presence
Note 3.13 HBI - “Host Bus Interface”, NASR - Not affected by software reset.
Detailed Reset Description
Power-On Reset (POR)
Hardware Reset Input Pin (nRESET)
Soft Reset (SRST)
PHY Soft Reset via PMT_CTRL bit 10 (PHY_RST)
PHY Soft Reset via PHY Basic Control Register (PHY REG 0.15)
PLL
X
X
shows the effect of the various reset sources on the LAN9215's circuitry.
Status Register” (PHY Reg. 1.2) is set before attempting to transmit or receive data.
of an external EEPROM. After any of these resets the application must verify that the EPC
Busy Bit (E2P_CMD, bit 31) is cleared before attempting to access the EEPROM, or
change the function of the GPO/GPIO signals, or before modifying the ADDRH or ADDRL
registers in the MAC.
Note
HBI
3.13
X
X
X
Table 3.10 Reset Sources and Affected Circuitry
REGISTERS
Note 3.13
NASR
X
X
DATASHEET
MIL
X
X
X
Section 5.5.11, "Interrupt Source Flag," on page
for additional information on this register. In this mode when
44
MAC
X
X
X
16-bit Non-PCI 10/100 Ethernet Controller with HP Auto-MDIX Support
Note 3.11
PHY
X
X
X
X
EEPROM MAC
RELOAD
Note 3.12
ADDR.
X
X
X
LATCHED
SMSC LAN9215
CONFIG.
STRAPS
119. If the
Datasheet
X
X
Section