DP83848VYB National Semiconductor, DP83848VYB Datasheet - Page 32

• Manufacturer Part Number: DP83848VYB
• Description: TRANSCEIVER, ENET PHY, 10/100, 48LQFP
• Manufacturer: National Semiconductor

Specifications of DP83848VYB

• Data Rate: 100Mbps
• No. Of Ports: 1
• Ethernet Type: IEEE 802.3u
• Supply Current: 92mA
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +105°C
• Digital Ic Case Style: LQFP
• No.: RoHS Compliant
• Interface Type: MII Serial, RMII
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Not Compliant

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6.0 Reset Operation
The DP83848VYB includes an internal power-on reset (POR)
function and does not need to be explicitly reset for normal
operation after power up. If required during normal operation,
the device can be reset by a hardware or software reset.
6.1 HARDWARE RESET
A hardware reset is accomplished by applying a low pulse
(TTL level), with a duration of at least 1 µs, to the RESET_N
pin. This will reset the device such that all registers will be
reinitialized to default values and the hardware configuration
values will be re-latched into the device (similar to the power-
up/reset operation).
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6.2 SOFTWARE RESET
A software reset is accomplished by setting the reset bit (bit
15) of the Basic Mode Control Register (BMCR). The period
from the point in time when the reset bit is set to the point in
time when software reset has concluded is approximately
1 µs.
A software reset will reset the device such that all registers
will be reset to default values and the hardware configuration
values will be maintained. Software driver code must wait 3
µs following a software reset before allowing further serial MII
operations with the DP83848VYB.