Section 5.13 – Texas Instruments TMS320TCI648x User Manual
Page 125
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5.13 SERDES Receive Channel Configuration Register n (SERDES_CFGRXn_CNTL)
SRIO Registers
There are four of these registers, to support four ports (see ). The general form for a SERDES receive
channel configuration register is summarized by
and
. See
for a
complete explanation of the programming of these registers.
Table 56. SERDES_CFGRXn_CNTL Registers and the Associated Ports
Register
Address Offset
Associated Port
SERDES_CFGRX0_CNTL
0100h
Port 0
SERDES_CFGRX1_CNTL
0104h
Port 1
SERDES_CFGRX2_CNTL
0108h
Port 2 (TMS320TCI6482 Only)
SERDES_CFGRX3_CNTL
010Ch
Port 3 (TMS320TCI6482 Only)
Figure 74. SERDES Receive Channel Configuration Register n (SERDES_CFGRXn_CNTL)
31
26 25
24
23
22
19 18
16
Reserved
Reserved
—
EQ
CDR
(write 0s)
R-0
R/W-0
R-0
R/W-0
R/W-0
15
14 13
12
11
10
8
7
6
5 4
2
1
0
TERM
—
LOS
ALIGN
—
INVPAIR
RATE
BUSWIDTH
ENRX
(write 001b)
(write 0)
R/W-0
R/W-0
R-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 57. SERDES Receive Channel Configuration Register n (SERDES_CFGRXn_CNTL) Field
Descriptions
Bit
Field
Value
Description
31–26
Reserved
000000b
These read-only bits return 0s when read.
25–24
Reserved
00b
Always write 0s to these reserved bits.
23
Reserved
0
This read-only bit returns 0 when read.
22–19
EQ
0000b–1111b
Equalizer. Enables and configures the adaptive equalizer to compensate for loss
in the transmission media. For the selectable values, see
18–16
CDR
Clock/data recovery. Configures the clock/data recovery algorithm.
000b
First order. Phase offset tracking up to
±
488 ppm.
001b
Second order. Highest precision frequency offset matching but poorest response
to changes in frequency offset, and longest lock time. Suitable for use in systems
with fixed frequency offset.
010b
Second order. Medium precision frequency offset matching, frequency offset
change response, and lock time.
011b
Second order. Best response to changes in frequency offset and fastest lock time,
but lowest precision frequency offset matching. Suitable for use in systems with
spread spectrum clocking.
100b
First order with fast lock. Phase offset tracking up to
±
1953 ppm in the presence of
..10101010.. training pattern, and
±
448 ppm otherwise.
101b
Second order with fast lock. As per setting 001, but with improved response to
changes in frequency offset when not close to lock.
110b
Second order with fast lock. As per setting 010, but with improved response to
changes in frequency offset when not close to lock.
111b
Second order with fast lock. As per setting 011, but with improved response to
changes in frequency offset when not close to lock.
SPRUE13A – September 2006
Serial RapidIO (SRIO)
125