CS8920A datasheet(13/144 Pages) CIRRUS

13 / 144 page

General Pins

Symbol

Pin Number

Type

Description

XTAL1

XTAL2

135

136

I/O

Crystal: A 20 MHz crystal should be connected across these pins. If a

crystal is not used, a 20 MHz signal should be connected to XTAL1 and

XTAL2 should be left open. (See section 9.0 and 13.0.)

SLEEP

116

Hardware Sleep: Active-low input used to enable the two hardware sleep

modes: Hardware Suspend and Hardware Standby. (See section 3.8.)

EWAKE

O4w

Wakeup Signal: The CS8920A asserts EWAKE high when a wakeup

frame is detected on the Ethernet receiver.

LINKLED

HC0

139

OD10 Link Good LED or Host Controlled Output 0: When the HCE0 bit of the

Self Control register (Register 15) is clear, this active-low output is low

when the CS8920A detects the presence of valid link pulses. When the

HCE0 bit is set, the host may drive this pin low by setting the HCBO in the

Self Control register.

BSTATUS

HC1

113

OD10 Bus Status or Host Controlled Output 1: When the HCE1 bit of the Self

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

receive activity causes an ISA bus access. When the HCE1 bit is set, the

host may drive this pin low by setting the HCB1 in the Self Control register.

LANLED

140

OD10 LAN Activity LED: During normal operation, this active-low output goes

low for 6 ms whenever there is a receive packet, a transmit packet, or a

collision. During Hardware Standby mode, this output is driven low when

the receiver detects network activity.

LOCALLED

OD10 Local Activity LED: During normal operation, this active-low output goes

low for 6 ms whenever there is either a receive packet addressed to this

node, or a transmit packet.

TEST

115

Test Enable: Active-low input used to put the CS8920A in Boundary Scan

Test mode. For normal operation, this pin should be high or left open.

RES

131

Reference Resistor: This input should be connected to a 4.99 K

Ω +/-1%

resistor needed for biasing of internal analog circuits.

DVDD1 -

DVDD5

12, 22,

55, 94, 101

Digital Power:

Provides 5 V +/- 5% power to the digital circuits of the

CS8920A.

DVSS1 -

DVSS5

11, 23, 56,

93, 100

Digital Ground: Provides ground reference (0V) to the digital circuits of the

CS8920A.

DSUB1 -

DSUB3

13, 54,

Provide additional ground references (0V) to digital circuits of the CS8920A.

AVDD1 -

AVDD3

133, 128,

123

Analog Power: Provides 5 V +/- 5% power to the analog circuits of the

CS8920A.

AVSS1 -

AVSS7

4, 124, 127,

132, 134,

137, 138

Analog Ground: Provide ground reference (0V) to the analog circuits of the

CS8920A.

AVSS1 -

AVSS4

4, 134,

137, 138

Provided additional ground references (0V) to analog circuits of the

CS8920A.

Pin Types:

Differential Input Pair

Input

Ground

Differential Output Pair

Output

Tri-State

Bi-Directional with Tri-State Output P

Power

Internal Weak Pullup

Open Drain Output

Digital outputs are followed by drive in mA (Example: OD24 = Open Drain Output with 24 mA drive).

CS8920A

DS238PP2

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