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CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

CS8900

General Pins

Symbol

XTAL1

XTAL2

SLEEP

LINKLED

or

HC0

BSTATUS

or

HC1

LANLED

TESTSEL

RES

DVDD1

DVDD2

DVDD3

DVDD4

DVSS1

DVSS1A

DVSS2

DVSS3

DVSS3A

DVSS4

AVDD1

AVDD2

AVDD3

AVSS0

AVSS1

AVSS2

AVSS3

AVSS4

Pin Number

97

98

77

99

78

100

76

93

9

22

56

69

8

10

23

55

57

70

90

85

95

1

89

86

94

96

Type

Description

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.)

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

modes: Hardware Suspend and Hardware Standby. (See section 3.7.)

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 CS8900 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.

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.

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.

IW Test Enable: Active-low input used to put the CS8900 in Boundary Scan

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

I Reference Resistor: This input should be connected to a 4.99 KΩ +/-1%

resistor needed for biasing of internal analog circuits.

P Digital Power: Provides 5 V +/- 5% power to the digital circuits of the

CS8900.

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

the CS8900.

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

CS8900.

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

the CS8900.

Pin Types:

dI = Differential Input Pair

I = Input

G = Ground

dO = Differential Output Pair

O = Output

ts = Tri-State

B = Bi-Directional with Tri-State Output P = Power

w = Internal Weak Pullup

OD = Open Drain Output

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

12

DS150PP2

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