CS89712 datasheet(144/170 Pages) CIRRUS

144 / 170 page

CS89712

144

DS502PP2

Notes: 1. All deglitched inputs are via the 16.384 kHz clock. Each deglitched signal must be held active for at least

two clock periods. Therefore, the input signal must be active for at least ~125

µs to be detected cleanly.

2. The RTC crystal must be populated for the device to function properly.

Oscillators

MOSCIN

MOSCOUT

RTCIN

RTCOUT

Main 3.6864 MHz oscillator for 18.432 MHz–73.728 MHz PLL

Real-Time Clock 32.768 kHz oscillator

Ethernet

EEPROM

EECS

EEPROM Chip Select - Active-high EEPROM select.

EESK

EEPROM Serial Clock - clocks data in/out of the EEPROM.

EEDataOut

EEPROM Data Out - used to send data to the EEPROM. Con-

nects to the DI pin on the EEPROM. When TEST is low, this

pin becomes the output for the Boundary Scan Test.

EEDataIn

EEPROM Data In - serial input used to receive data from the

EEPROM. Connects to the DO pin on the EEPROM.

EEDataIn is also used to sense the presence of the EEPROM.

This signal has a weak internal pullup.

10BASE-T

Interface

TXD+/TXD-

A16,

A15

10BASE-T Transmit, Differential Output Pair - drives 10 Mb/s

Manchester-encoded data to the 10BASE-T transmit pair.

RXD+/RXD-

A12,

A11

10BASE-T Receive, Differential Input Pair - Differential input

pair receives 10 Mb/s Manchester-encoded data from the

10BASE-T receive pair.

General

Ethernet Pins

RES

A10

Reference Resistor, Input - This input should be connected

to a 4.99KW ± 1% resistor needed for biasing of internal ana-

log circuits.

XTAL[1:2]

A8, A7

Crystal, Input/Output - A 20 MHz crystal should be con-

nected to these pins. If a crystal is not used, a 20 MHz signal

should connect to XTAL1 and XTAL2 should be left open.

LINKLED or

HC0

Link Good LED or software Controlled Output 0, Open

Drain Output- When the HCE0 bit of the Self Control register

(Register 15) is clear, this active-low output is low when the

CS89712 detects the presence of valid link pulses. When the

HC0E bit is set, the software may drive this pin low by setting

the HCBO in the Self Control register.

LANLED

LAN Activity LED, Open Drain Output - During normal oper-

ation, this active-low output goes low for 6 ms whenever there

is a receive packet, a transmit packet, or a collision.

No Connects

N/C

No connects should be left as no connects; do not connect to ground

Function

Signal

Name

Signal

Description

Table 90. External Signal Functions (Continued)

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