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3. Serial RapidIO Electrical Interface > Port Lanes
75
Tsi574 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
3.6.2
Lane Swapping
Lane swap
is the ability to reverse the order of the transmit and receive pins. The Tsi574 allows the
order of the transmit and/or receive pins of each 4x port to be reversed in order to simplify board layout
issues. Lane swap is only supported when the MAC is operating in 4x mode.
Lane swapping for 1x mode is not supported. If the Tsi574 port to a connector is lane swapped as 4x
mode and a 1x mode device in inserted into the connector, the 4x mode port will fail-down (that is,
become a 1x mode connection) and lane A is initialized. However, if the Tsi574 port to a connector is
lane swapped as 4x mode and then re-configured to operate as a 1x mode, the swapping is canceled and
the port will be unable to connect to a 1x mode device.
shows the lane sequence for Tsi574’s swapped 4x mode lanes, the connector, and the sequence
for non-swapped 1x mode lanes.
3.6.2.1
Configuration
On reset, the lane swap setting for the entire device is controlled by two configuration pins,
SP_RX_SWAP and SP_TX_SWAP (see
).
Register fields SWAP_TX and SWAP_RX fields in the
“SRIO MAC x Digital Loopback and Clock
Selection Register” on page 369
can also be written at reset time by I
2
C initialization or by software
override to set lane swap on a per MAC basis. The reset value of these fields indicates the sampled
values of the SP_RX_SWAP and SP_TX_SWAP configuration pins. When a different value is written
to either the SWAP_TX or SWAP_RX fields, the MAC has to be reset in order to ensure that the links
retrain and communication is re-established with the changed lane configuration.
3.6.2.2
Lanes and Channels
The terms lanes and channels identify input and output signals. Lanes are enumerated using alphabetic
characters (A, B, C, D). The pin associated with a lane changes depending on the lane swap settings.
Table 7: Lane Sequence
Swapped 4x Mode
Mated Connector
Unswapped 1x Mode
Lane Sequence
Lane Sequence
Lane Sequence
D
D
A
C
C
B
B
B
C
A
A
D
When changing the lane swap setting for a MAC, it is necessary to reset the port through the
SOFT_RST_X4 fields in the
Содержание IDT Tsi574
Страница 1: ...IDT Tsi574 Serial RapidIO Switch User Manual June 6 2016 Titl...
Страница 20: ...About this Document 20 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 34: ...1 Functional Overview JTAG Interface 34 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 100: ...4 Internal Switching Fabric Packet Queuing 100 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 224: ...11 Signals Pinlist and Ballmap 224 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 490: ...B Clocking P_CLK Programming 490 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 512: ...Index 512 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...