ONET2804TLP Datasheet, PDF (16/29 Pages) Texas Instruments – Low-Power, 28-Gbps, 4-Channel Limiting TIA

ONET2804TLP
SBAS796 – JULY 2017
www.ti.com
7.6.1 Register Descriptions
This section describes the circuit functionality based on the register settings. Table 2 defines the various register
bit field types used in this document.
SYMBOL
R
R/W
W
Table 2. Register Bit Field Types
DESCRIPTION
Read
Read, write, or both
Write
ACCESS, READ ACTION, WRITE VALUE
Read-only
Read-write
Write-only
7.6.2 Register 0: Control Settings (address = 00h) [reset = 0h]
Figure 15. Register 0
7
RESET
W-0h
6
PD
R/W-0h
5
RESERVED
R-Xh
4
RESERVED
R-Xh
3
RESERVED
R-Xh
2
RESERVED
R-Xh
1
RESERVED
R-Xh
0
PWRITE
R/W-0h
Bit Field
7
RESET
6
PD
5-1 Reserved
0
PWRITE
Type
W
R/W
R
R/W
Table 3. Register 0 Field Descriptions
Reset
0h
0h
Undefined
0h
Description
Reset registers bit.
1 = Resets all registers to default values
0 = Normal operation
Power-down bit.
1 = Power down all channels (I_CC is approximately 4 mA)
0 = Normal operation
Reserved. Read-only.
Parallel write mode bit.
1 = Parallel write enabled (write register value to all channels)
0 = Serial write
7.6.3 Register 1: Amplitude and Rate for Channel 1 (address = 01h) [reset = 0h]
7
RATE3
R/W-0h
6
RATE2
R/W-0h
5
RATE1
R/W-0h
Figure 16. Register 1
4
RATE0
R/W-0h
3
AMP3
R/W-0h
2
AMP2
R/W-0h
1
AMP1
R/W-0h
0
AMP0
R/W-0h
Bit
Field
7-4
RATE[3 :0]
3-0
AMP[3:0]
Table 4. Register 1 Field Descriptions
Type
R/W
R/W
Reset
0h
0h
Description
Rate adjustments bits for channel 1.
0000 = 21 GHz (default)
0111 = BW decrease of approximately 0.4 GHz
1111 = BW increase of approximately 0.4 GHz
All others: Do not use
Amplitude adjustment bits for channel 1.
Table 5 lists the bit settings for AMP[3:0].
16
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