CS8900-CQ 查看數據表（PDF） - Cirrus Logic

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CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

CS8900

Not in Boundary Scan

Test Mode

TESTSEL switches low (AEN must be low)

ENTER BOUNDARY SCAN:

CS8900 resets, all digital

output pins and bi-directional

pins enter High-Z state,

and AEN becomes shift clock

AEN switches high

AEN switches low

OUTPUT CYCLE

34 cycles

AEN switches high

Selected output

goes low

INPUT CYCLE

AEN switches low

50 cycles

AEN switches high

AEN switches low

Selected input

copied out

to the

EEDataOut

pin

AEN switches high

All digital output pins and

bi-directional pins enters

High-Z state

TESTSEL switches high

EXIT BOUNDARY SCAN:

AEN becomes ISA bus

Address Enable

Figure 6.1. Boundary Scan Continuity Cycle

110

DS150PP2

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