CS89712-CB datasheet(11/170 Pages) CIRRUS

Il numero della parte	CS89712-CB

Spiegazioni elettronici	HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH 10BASE-T ETHERNET CONTROLLER

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Produttore elettronici	CIRRUS [Cirrus Logic]

Homepage	http://www.cirrus.com

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CS89712

DS502PP2

11

nPOR is the highest priority reset signal. When ac-

tive (low), it will reset all storage elements in the

CS89712. nPOR active forces nSYSRES and nST-

BY active. nPOR will only be active after the

CS89712 is first powered up and not during any

other resets. nPOR active clears all flags in the sta-

tus register except for the cold reset flag (CLD-

FLG) bit (SYSFLG, bit 15), which is set.

nSYSRES is generated internally in the CS89712 if

either nPOR, nPWRFL, or nURESET are active. It

is the second highest priority reset signal, used to

asynchronously reset most internal registers.

nSYSRES activation forces nSTBY and RUN low,

and resets the CS89712 leaving it in the Standby

State.

The nSTBY and RUN signals are high when the

CS89712 is in the Operating or Idle States and low

when in the Standby State. The main system clock

is valid when nSTBY is high. The nSTBY signal

will disable any peripheral block that is clocked

from the master clock source (i.e., everything ex-

cept for the RTC). However, when in Snooze State,

the LCD controller and the DC to DC converter in-

terface peripherals will NOT be disabled.

In general, a system reset will clear all registers and

nSTBY will disable all peripherals that require a

main clock, with the exception of the Snooze State

operation as described above. The following pe-

ripherals are always disabled by a low level on

nSTBY: two UARTs and IrDA SIR encoder, timer

counters, telephony codec, and the two SSI inter-

faces. In addition, when in the Standby State, the

LCD controller and PWM drive are also disabled.

2.5 Ethernet Port Reset and Initialization

Different considerations apply to resetting and ini-

tializing the Ethernet Port.

2.5.1

Reset

Three different conditions cause the Ethernet port

to reset its Ethernet internal registers and circuits.

2.5.1.1

Power-Up Reset

When power is applied, the Ethernet port maintains

reset until the voltage at the supply pins reaches ap-

proximately 2.5 V. The Ethernet port comes out of

reset once Vcc is greater than approximately 2.5 V

and the crystal oscillator has stabilized.

2.5.1.2

Software Initiated Reset

There is a chip-wide reset whenever the RESET bit

(SelfCTL Register, Bit 6) is set.

2.5.1.3

Software Suspend

Whenever the Ethernet port enters Software Sus-

pend mode, all registers and circuits are reset.

Upon exit, there is a chip-wide reset.

2.5.2

Allowing Time for Reset Operation

After a reset, the Ethernet port goes through a self

configuration. This includes calibrating on-chip

analog circuitry, and reading EEPROM for validity

and configuration. Time required for the reset cali-

bration is typically 10 ms. Software drivers should

not access registers internal to the CS89712 Ether-

net during this time. When calibration is done, bit

INITD in the Self Status Register is set indicating

that initialization is complete, and the SIBUSY bit

in the same register is cleared indicating the EE-

PROM is no longer being read.

2.5.3

Initialization

After each reset (except EEPROM Reset), the

CS89712’s Ethernet port checks the sense of the

EEDataIn pin to see if an external EEPROM is

present. EEDI high indicates presence of an EE-

PROM and the Ethernet port automatically loads

the configuration data stored in the EEPROM into

its internal registers (see next section). If EEDI is

low, an EEPROM is not present and the Ethernet

port resets with the register values in Table 2.

An optional low-cost serial EEPROM can be used

to store configuration information that is automati-

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