CS8900A-CQZ 查看數據表（PDF） - Cirrus Logic

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CS8900A-CQZ

Crystal LAN™ Ethernet Controller

Cirrus Logic 

CS8900A

Crystal LAN™ Ethernet Controller

Not in Boundary Scan

Test Mode

TEST switches low (AEN m ust be low)

ENTER BOUNDARY SCAN:

C S8900A resets, all digital

output pins and bi-directional

pins enter H igh-Z state,

and AEN becom es shift clock

AEN switches high

OUTPUT CYCLE

AEN switches low

34 cycles

AEN switches high

Selected output

goes low

INPUT CYCLE

AEN switches low

50 cycles

AEN switches high

AEN switches low

AEN switches high

All digital output pins and

bi-directional pins enters

High-Z state

TEST switches hig h

EXIT BOUNDARY SCAN:

AEN becomes ISA bus

Address Enable

Figure 32. Boundary Scan Continuity Cycle

Selected input

copied out

to the

EE D ataO ut

pin

CIRRUS LOGIC PRODUCT DATASHEET

110

DS271F4

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