cs8952t Cirrus Logic, Inc., cs8952t Datasheet - Page 24

• Manufacturer Part Number: cs8952t
• Description: 100base 10base-t Transceiver
• Manufacturer: Cirrus Logic, Inc.

Reset Operation
Reset occurs in response to six different conditions:
1) There is a chip-wide reset whenever the RE-
2) When power is applied, the CS8952T main-
3) There is a chip-wide reset whenever the RE-
4) Digital circuitry is reset whenever bit 0 of the
5) Analog circuitry is reset and recalibrated when-
24
SET pin is high for at least 200 ns. During a
chip-wide reset, all circuitry and registers in the
CS8952T are reset.
tains reset until the voltage at the VDD supply
pins
CS8952T comes out of reset once VDD is
greater than approximately 3.6 V and the crys-
tal oscillator has stabilized.
SET bit (bit 15 of the Basic Mode Control Reg-
ister (address 00h)) is set.
PCS Sub-Layer Configuration Register (ad-
dress 17h) is set. Analog circuitry is unaffected.
ever the CS8952T enters or exits the power-
down state, as requested by pin PWRDN.
reaches
approximately
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
3.6 V.
The
CrystalLAN™ 100BASE-X and 10BASE-T Transceiver
6) Analog circuitry is reset and recalibrated when-
After a reset, the CS8952T latches the signals on
various input pins in order to initialize key registers
and goes through a self configuration. This in-
cludes calibrating on-chip analog circuitry. Time
required for the reset calibration is typically 40 ms.
External circuitry may access registers internal to
the CS8952T during this time. Reset and calibra-
tion complete is indicated when bit 15 of the Basic
Mode Control Register (address 00h) is clear.
LED Indicators
The LEDx, SPD100, and SPD10 output pins pro-
vide status information that can be used to drive
LEDs or can be used as inputs to external control
circuitry. Indication options include: receive activ-
ity, transmit activity, collision, carrier sense, polar-
ity OK, descrambler synchronization status, auto-
negotiation status, speed (10 vs. 100), and duplex
mode.
ever the CS8952T changes between 10 Mb/s
and 100 Mb/s modes.
DS206TPP2
CS8952T