lan9311 Standard Microsystems Corp., lan9311 Datasheet - Page 37

• Manufacturer Part Number: lan9311
• Description: Lan9311/lan9311i Two Port 10/100 Managed Ethernet Switch With 16-bit Non-pci Cpu Interface
• Manufacturer: Standard Microsystems Corp.

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
4.2.1
4.2.1.1
RESET SOURCE
Digital Reset
Virtual PHY
Port 2 PHY
Port 1 PHY
Soft Reset
nRST Pin
Note 4.1
Chip-Level Resets
A chip-level reset event activates all internal resets, effectively resetting the entire LAN9311/LAN9311i.
Configuration straps are latched, and the EEPROM Loader is run as a result of chip-level resets. A
chip-level reset is initiated by assertion of any of the following input events:
Chip-level reset completion/configuration can be determined by polling the READY bit of the
Configuration Register (HW_CFG)
When set, the READY bit indicates that the reset has completed and the device is ready to be
accessed.
With the exception of the
Register
(RESET_CTL), read access to any internal resources is forbidden while the READY bit is cleared.
Writes to any address are invalid until the READY bit is set.
Note: The LAN9311/LAN9311i must be read at least once after any chip-level reset to ensure that
Power-On Reset (POR)
A power-on reset occurs whenever power is initially applied to the LAN9311/LAN9311i, or if the power
is removed and reapplied to the LAN9311/LAN9311i. This event resets all circuitry within the device.
Configuration straps are latched, and the EEPROM Loader is run as a result of this reset.
Power-On Reset (POR)
nRST Pin Reset
POR
write operations function properly.
Table 4.1 Reset Sources and Affected LAN9311/LAN9311i Circuitry
(PMT_CTRL),
In the case of a soft reset, the EEPROM Loader is run, but loads only the MAC address
into the Host MAC. No other values are loaded by the EEPROM Loader in this case.
X
X
X
X
X
X
Byte Order Test Register
Hardware Configuration Register
X
X
X
or
DATASHEET
X
X
X
X
X
Power Management Control Register (PMT_CTRL)
37
X
X
X
X
X
X
X
X
(BYTE_TEST), and
(HW_CFG),
X
X
X
X
X
X
Power Management Control
Reset Control Register
X
X
X
Revision 1.2 (04-08-08)
X
X
until it is set.
Note 4.1
Hardware
X
X
X