Advance Product Information
Subject to Change
VSC7111 Datasheet
Registers
Table 33.
Register 58’h: Global Output Level (continued)
Bit Name
Access Description
Default
6
GODBOOST
R/W
R/W
R/W
Output driver bandwidth
1: Do not scale currents with output level
0: Scale currents with output level
0
5:4 GODHIGHPOWER
3:0 GODRV
Output driver bandwidth
11: Maximum power/bandwidth
00: Minimum power/bandwidth
00
Global output drive level
1111: 1600 mV (maximum)
1110: 1450 mV
1001
1101: 1300 mV
1100: 1130 mV
1011: 1000 mV
1010: 900 mV
1001: 800 mV
1000: 740 mV
0111: 680 mV
0110: 630 mV
0101: 580 mV
0100: 540 mV
0011: 500 mV
0010: 450 mV (minimum)
0001: Vitesse use only (unspecified output swing)
0000: Vitesse use only (unspecified output swing)
3.4.9
Global Output Mode
This register controls OOB signaling and output modes for all outputs.
Table 34.
Register 59’h: Global Output Mode
Bit Name
Access Description
Default
7
6
Unused
R
Unused
0
0
GOSC_FREQ_TWEAK
R/W
Oscillator frequency tweak
1: Tweak internal sample clock rate ±1%
0: Nominal internal sample clock rate
5
4
3
2
1
GSLEWLIM
GJAM
R/W
R/W
R/W
R/W
R/W
Global limit slew rate
1: Limit slew rate to 100 ps
0: Normal slew rate
0
0
0
0
0
Global forced output
1: Output is forced to jam value
0: Output normal
GJAMVAL
GDRVCM
GOOBEN
Global forced output value
1: Output value is 1
0: Output value is 0
Global drive common-mode
1: Output suppressed (0 differential drive)
0: Output normal
Global OOB forwarding enable
1: Enable OOB (0 differential when LOS
detected)
0: Disable OOB forwarding
Revision 2.0
September 2010
Confidential
Page 38
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
