3. Serial RapidIO Electrical Interface > Port Aggregation: 1x and 4x Modes
68
Tsi576 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
3.2.1
Port Configuration
Ports that operate in either 4x or 1x mode can be configured as either one 4x mode port or dual 1x
mode ports. For example, SP0 can be configured as either one 4x mode port, or Port 0 and Port 1 can be
dual 1x mode ports.
Figure 13: Port Configuration
3.3
Port Aggregation: 1x and 4x Modes
The RapidIO ports on the Tsi576 are grouped into pairs that share the same MAC. The MAC provides
the PMA/PCS encoding/decoding layers, as well as the RapidIO physical, transport and logical layer
functionality required of a RapidIO switch device.
The MACs are numbered by even numbers and support the ports in the following manner: serial ports
0 and 1 use MAC 0, ports 2 and 3 use MAC 2, etc. Ports are grouped into pairs of N and N+1, where N
is even.
Two configurations are possible on each 4x mode-capable port:
•
Both port N and port N+1 can operate in 1x mode (the 1x + 1x configuration)
14
Serial Port 14 (SP14)
Unavailable
This port is un-initialized and the
port registers must be treated
as reserved.
Writes to port registers can
cause undefined behavior and
is not recommended. The
registers can be read.
15
Serial Port 15 (SP15)
Unavailable
This port is un-initialized and the
port registers must be treated
as reserved.
Writes to port registers can
cause undefined behavior and
is not recommended. The
registers can be read.
Table 4: Tsi576 Port Numbering
Port Number
RapidIO Port
Mode
Note
SP0
(4x or 1x)
SP1
(1x only)
Tx(Lane A,B,C,D)
Rx(Lane A,B,C,D)
X
4x Mode
SP0
(4x or 1x)
SP1
(1x only)
Dual 1x Mode
OR
Tx(Lane A)
Rx(Lane A)
Tx(Lane B)
Rx(Lane B)
Port 0
Port 1
Port 0
