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5.14 SERDES Transmit Channel Configuration Register n (SERDES_CFGTXn_CNTL)
SRIO Registers
There are four of these registers, to support four ports (see
Table 59
). The general form for a SERDES
transmit channel configuration register is summarized by
Figure 75
and
Table 60
. See
Section 2.3.2.3
for
a complete explanation of the programming for these registers.
Table 59. SERDES_CFGTXn_CNTL Registers and the Associated Ports
Register
Address Offset
Associated Port
SERDES_CFGTX0_CNTL
0110h
Port 0
SERDES_CFGTX1_CNTL
0114h
Port 1
SERDES_CFGTX2_CNTL
0118h
Port 2 (TMS320TCI6482 Only)
SERDES_CFGTX3_CNTL
011Ch
Port 3 (TMS320TCI6482 Only)
Figure 75. SERDES Transmit Channel Configuration Register n (SERDES_CFGTXn_CNTL)
31
17
16
Reserved
ENFTP
R-0
R/W-0
15
12 11
9
8
7
6
5 4
2
1
0
—
DE
SWING
CM
INVPAIR
RATE
BUSWIDTH
ENTX
(write 0)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = Value after reset
Table 60. SERDES Transmit Channel Configuration Register n (SERDES_CFGTXn_CNTL) Field
Descriptions
Bit
Field
Value
Description
31–17
Reserved
0
These read-only bits return 0s when read.
16
ENFTP
1
Enables fixed phase relationship of transmit input clock with respect to transmit
output clock. The only valid value for this field is 1b; all other values are reserved.
15–12
DE
0000b–1111b
De-emphasis. Selects one of 15 output de-emphasis settings from 4.76 to 71.42%.
De-emphasis provides a means to compensate for high frequency attenuation in
the attached media. It causes the output amplitude to be smaller for bits which are
not preceded by a transition than for bits which are. See
Table 61
.
11–9
SWING
000b–111b
Output swing. Selects one of 8 output amplitude settings between 125 and
1250mV
dfpp
. See
Table 62
.
8
CM
Common mode. Adjusts the common mode to suit the termination at the attached
receiver.
0
Normal common mode. Common mode not adjusted.
1
Raised common mode. Common mode raised by 5% of e
54
.
7
INVPAIR
Invert polarity. Inverts the polarity of RIOTXn and RIOTXn.
0
Normal polarity. RIOTXn is considered to be positive data and RIOTXn negative.
1
Inverted polarity. RIOTXn is considered to be negative data and RIOTXn positive.
6–5
RATE
Operating rate. Selects full, half, or quarter rate operation.
00b
Full rate. Two data samples taken per PLL output clock cycle.
01b
Half rate. One data sample taken per PLL output clock cycle.
10b
Quarter rate. One data sample taken every two PLL output clock cycles.
11b
Reserved
4–2
BUSWIDTH
000b
Bus width. Always write 000b to this field, to indicate a 10-bit-wide parallel bus to
the clock. All other values are reserved. See
Section 2.3.2.1
for an explanation of
the bus.
1
Reserved
0
Always write 0 to this reserved bit.
128
Serial RapidIO (SRIO)
SPRUE13A – September 2006
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