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CS8900-IQ3

Crystal LAN™ ISA Ethernet Controller

Cirrus Logic 

CS8900A

Crystal LAN™ ISA Ethernet Controller

SLEEP - Hardware Sleep, Input Internal Weak Pullup PIN 77.

Active-low input used to enable the two hardware sleep modes: Hardware Suspend and

Hardware Standby. (See Section 3.7 on page 25.)

LINKLED or HC0 - Link Good LED or Host Controlled Output 0, Open Drain Output PIN 99.

When the HCE0 bit of the Self Control register (Register 15) is clear, this active-low output is

low when the CS8900A detects the presence of valid link pulses. When the HC0E bit is set, the

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

BSTATUS or HC1 - Bus Status or Host Controlled Output 1, Open Drain Output PIN 78.

When the HC1E 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 HC1E bit is set, the host may

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

LANLED - LAN Activity LED, Open Drain Output PIN 100.

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.

TEST - Test Enable, Input Internal Weak Pullup PIN 76.

Active-low input used to put the CS8900A in Boundary Scan Test mode. For normal operation,

this pin should be high.

RES - Reference Resistor, Input PIN 93.

This input should be connected to a 4.99KΩ ± 1% resistor needed for biasing of internal analog

circuits.

DVDD[1:4] - Digital Power, Power PINS 9, 22, 56, and 69.

Provides 5 V ± 5% power to the digital circuits of the CS8900A.

DVSS[1:4} and DVSS1A, DVSS3A - Digital Ground, Ground PINS 8, 10, 23, 55, 57, and 70.

Provides ground reference (0 V) to the digital circuits of the CS8900A.

AVDD[1:3] - Analog Power, Power PINS 90, 85, and 95.

Provides 5 V ± 5% power to the analog circuits of the CS8900A.

AVSS[0:4] - Analog Ground, Ground PINS 1, 89, 86, 94, 96.

Provide ground reference (0 V) to the analog circuits of the CS8900A.

CIRRUS LOGIC PRODUCT DATASHEET

DS271PP4

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