Datasheet

LMH0387
SNLS315G –APRIL 2010–REVISED APRIL 2013 www.ti.com
SPI Registers
Table 1. SPI Registers
Address R/W Name Bits Field Default Description
00h R/W General Control 7 Carrier Detect Read only.
0: No carrier detected on
BNC_IO pin.
1: Carrier detected on BNC_IO
pin.
6 Mute 0 0: Normal operation.
1: Equalizer outputs muted.
5 Reserved 0 Reserved as 0. Always write 0
to this bit.
4:3 Sleep Mode 01 Equalizer sleep mode control.
Sleep has precedence over
Mute.
00: Never sleep. Disable sleep
mode (force equalizer to stay
enabled).
01: Auto sleep. Sleep mode
active when no input signal
detected.
10: Force sleep. Force
equalizer into sleep mode
(powered down) regardless of
whether there is an input signal
or not.
11: Reserved.
2 Extended 3G Reach Mode 0 Extended 3G reach mode to
extend the equalizable cable
length for 2.97 Gbps
applications.
0: Normal operation.
1: Extended 3G reach mode.
1:0 Reserved 00 Reserved as 00. Always write
00 to these bits.
01h R/W Output Driver 7:5 Output Swing 011 Equalizer output driver swing
(V
SSP-P
).
000: V
SSP-P
= 400 mV
P-P
.
001: V
SSP-P
= 500 mV
P-P
.
010: V
SSP-P
= 600 mV
P-P
.
011: V
SSP-P
= 700 mV
P-P
.
100: V
SSP-P
= 800 mV
P-P
.
101, 110, 111: Reserved.
4:2 Offset Voltage 001 Equalizer output driver offset
voltage (common mode
voltage).
000: V
OS
= 1.05V.
001: V
OS
= 1.25V.
010: V
OS
= 1.45V.
011: V
OS
= 1.65V.
100: V
OS
= 1.85V.
101: V
OS
referenced to positive
supply.
110, 111: Reserved.
1:0 Reserved 00 Reserved as 00. Always write
00 to these bits.
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