VSC7177 データシートの表示（PDF） - Maxim Integrated
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VSC7177 Datasheet PDF : 24 Pages
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VSC7177
Data Sheet
Inactive Port Functionality
The MODE0 pin controls the functionality of the output driver for the unconnected port.
In both edge-sensitive and level-sensitive sideband modes, the output of the unconnected port (P0OUTP/N or
P1OUTP/N) transmits port 2 input data when MODE0 is HIGH. The output driver transmits the data received by that
unconnected port when MODE0 is LOW. Note that this loopback functionality differs from the VSC7173 and the
VSC7175 in edge-sensitive sideband mode.
Table 3 summarizes the sideband-based port selection functionality.
Table 3. Sideband-based Port Selection Operating Modes
MODE1
0 (level)
0 (level)
0 (level)
0 (level)
1 (edge)
1 (edge)
1 (edge)
1 (edge)
Input Pins
MODE0
PORTSEL0
0
0
0
1
1
0
1
1
0
X
0
↑
1
X
1
↑
PORTSEL1
0 (1)
0 (1)
0 (1)
0 (1)
↑
X
↑
X
P0OUT
P2IN
P0IN
P2IN
P2IN
P0IN
P2IN
P2IN
P2IN
Output Pins
P1OUT
P2OUT
P1IN
P0IN
P2IN
P1IN
P2IN
P0IN
P2IN
P1IN
P2IN
P1IN
P1IN
P0IN
P2IN
P1IN
P2IN
P0IN
P0SLTD
OOBPORT1
OOBPORT1
OOBPORT1
OOBPORT1
0
1
0
1
X = don’t care; ↑ = rising.
1. PORTSEL1 must equal VSS in level-sensitive sideband-based port selection mode. See Table 1, page 5.
Reset State
The power-up state of the VSC7177 while in sideband-based port selection mode is based upon the PORTSEL0 and
PORTSEL1 input signals. When in level-sensitive sideband 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 sideband mode, the active port connected to port 2 is defined in Table 4. The state diagram in
Figure 2 indicates the same result in a different format.
Table 4. Power-Up State (Edge-Sensitive Sideband Mode)
PORTSEL0
0
1
0
1
PORTSEL1
0
0
1
1
Active Port
Port 0 selected
Port 0 selected
Port 1 selected
Port 0 selected
P0SLTD Output
1
1
0
1
7 of 24
Revision 4.2
July 29, 2005
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