S2067
DUAL SERIAL BACKPLANE DEVICE WITH DUAL I/O
The loopback mode provides the ability to perform
system diagnostics and off-line testing of the inter-
face to guarantee the integrity of the serial channel
before enabling the transmission medium.
OTHER OPERATING MODES
Operating Frequency Range
The S2067 is designed to operate at serial baud
rates of 0.77 GHz to 1.3 GHz (616 Mbit/sec to 1040
Mbit/sec user data rate). The part is specified at the
Fibre Channel rate (1062 MHz) and the Gigabit
Ethernet rate (1.25 GHz), but will operate satisfacto-
rily at any rate in this range.
The high speed serial outputs are disabled when
loopback operation is enabled.
TEST MODES
The RESET pin is used to initialize the Transmit
FIFOs and must be asserted (LOW) prior to entering
the normal operational state (see section Transmit
FIFO Initialization).
Loopback Mode
When loopback mode is enabled, the serial data
from the transmitter is provided to the serial input of
the receiver. Loopback mode can be simultaneously
enabled for both channels using the loopback-en-
able input, LPEN.
Figure 8. S2067 Diagnostic Loopback
Output
Disabled
CSU
CRU
October 13, 2000 / Revision E
12
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
