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VSC7173

Data Sheet

Revision 4.1

May 23, 2005

Confidential

Reset State

The power-up state of the VSC7173 is based on the PORTSEL0 and PORTSEL1 input signals. When in level-

sensitive mode, the active port connected to port 2 is controlled directly by the PORTSEL0 input. This is the same

behavior as the normal operating condition described above. When in edge-sensitive mode, the active port connected

to port 2 is defined in Table 3. The state diagram in Figure 3 indicates the same result in a different format.

Table 3. Power-up State (Edge-Sensitive Mode)

PORTSEL0

PORTSEL1

Active Port

P0SLTD Output

0

0

Port 0 selected

1

1

0

Port 0 selected

1

0

1

Port 1 selected

0

1

1

Port 0 selected

1

Figure 3. Reset State Machine (Edge-Sensitive Mode)

Reset State

Port 0 Selected

Port 1 Selected

PORTSEL0=0, PORTSEL1=1

and Reset=0

(PORTSEL0=1, PORTSEL1=1

or PORTSEL1=0)

and Reset=0

PORTSEL0

PORTSEL1

Reset=1

Reset=1