10. Clocks, Resets and Power-up Options > Power-up Options
211
Tsi574 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
Table 28: Power-Up Options Signals
Pin Name
Description
SP{n}_MODESEL
Selects the serial port operating mode for ports n and n+1
0 = Port n operating in 4x mode (Port n+1 not available)
1 = Ports n and n+1 operating in 1x mode
Note: The MAC_MODE in the
“SRIO MAC x Digital Loopback and Clock
Selection Register” on page 369
overrides and determine the operating
mode for the corresponding ports.
SP_IO_SPEED[1:0]
Serial Port Transmit and Receive operating frequency select.
SP_IO_SPEED[1:0], these pin select the power-up serial port frequency
for
all
ports.
00 = 1.25Gbit/s
01 = 2.5Gbit/s
10 = 3.125Gbit/s (default)
11 = illegal
Note; The SP_IO_SPEED[1:0] setting is equal to the IO_SPEED field in
the
“SRIO MAC x Digital Loopback and Clock Selection Register” on
Output capability of this pin is only used in test mode.
SP{n}_PWRDN
Port n Transmit and Receive Power Down Control
This signal controls the state of Port n
and Port n+1
The PWRDN controls the state of all four lanes (A/B/C/D) of SerDes
Macro.
0 = Port n Powered Up. Port n+1 controlled by SP{n+1}_PWRDN.
1 = Port n Powered Down. Port n+1 Powered Down.
Override SP{n}_PWRDN using PWDN_X4 field in the
Digital Loopback and Clock Selection Register” on page 369
.
SP{n+1}_PWRDN
Port n+1 Transmit and Receive Power Down Control
This signal controls the state of Port n+1. Note that Port n+1 is never
used when 4x mode is selected for a Serial Rapid I/O MAC, and it must
be powered down.
0 = Port n+1 Powered Up
1 = Port n+1 Powered Down
Override SP{n+1}_PWRDN using PWDN_X1 field in the
Digital Loopback and Clock Selection Register” on page 369
.
SP_RX_SWAP
Configures the order of 4x receive/transmit lanes on serial ports [0,2,4,6,]
0 = A, B, C, D
1 = D, C, B, A
Override SP_RX(TX)_SWAP using RX(TX)_SWAP field in the
MAC x Digital Loopback and Clock Selection Register” on page 369
.
SP_TX_SWAP
