VSC7177 データシートの表示（PDF） - Maxim Integrated

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VSC7177

Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI

Maxim Integrated 

VSC7177

Data Sheet

PORTSEL0,

PORTSEL1

tPW

tPW

PORTSEL0

tPSS

tPSS

PORTSEL1

tSW

tSW

tSW

Active Host Port

(Port 0 or Port 1)

* Edge sensitive sideband operation shown in timing diagram.

Note: Edge-sensitive side band operation shown.

Figure 8. Timing Waveform—Sideband Switching

Table 14. Sideband Switching

Symbol Parameter

Minimum Maximum Unit Condition

tPW

Pulse width of the port selection pins (PORTSEL0,

4.0

ns

PORTSEL1)

tPSS

Separation between rising edge transitions of the

5.0

port selection pins

ns Applies to edge-sensitive

sideband operation.

tSW

Switch time. The time required to make the other

host port active following an active edge transition

of the port selection pins.

5.0

ns Applies to both level and

edge-sensitive sideband

operations.

17 of 24

Revision 4.2

July 29, 2005

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