Data Sheet
June 2003
TTSV02622 STS-24 Backplane Transceiver
Test Features
s
Line loopback:
— There is a line loopback feature allowing the user to perform a loopback on the line side (per device control).
The line frame signal used by the pointer mover is automatically replaced by the system frame signal when
operating in line loopback mode.
LVDS loopback:
— There is a LVDS loopback feature allowing the user to perform a loopback on the LVDS side (per device
control).
A1/A2 error insert:
— There is a frame error inject feature, in the transmitter section, allowing the user to replace framing bytes
A1/A2 (only last A1 byte and first A2 byte) with a selectable A1/A2 byte value for a selectable number of con-
secutive frames. The number of consecutive frames to alter is specified by a 4-bit field, while A1/A2 value is
specified by two 8-bit fields. The error insert feature is on a per-channel basis, A1/A2 values and 4-bit frame
count value are on a per-device basis.
B1 error insert:
— There is a B1 error insert feature, in the transmitter section, allowing the user to insert errors on user select-
able bits in the B1 byte. Errors are created by simply inverting bit values. Bits to invert will be specified through
an 8-bit register (each bit is associated with one of the eight B1 bits). To insert an error, software will first set
the bits in the transmitter B1 error insert mask. Then, on a per-channel basis, software will write a one to the
b1 error insert command. The insertion circuitry performs a rising edge detect on the bit, and will issue a cor-
ruption signal for the next frame, for one frame only. This feature is on a per-channel basis.
TOH serial output port parity error insert:
— There is a parity error inject feature, in the receive section, allowing the user to invert the parity bit of each
serial output port. This feature inserts a single error. This feature is on a per-channel basis.
Parallel output bus parity error insert:
— There is a parity error inject feature, in the receive section, allowing the user to invert parity lines associated
with each output parallel buses. This feature inserts a single error. This feature is on a per-channel basis. This
feature supports both even and odd parities.
Scrambler/descrambler disable:
— There is a scrambler/descrambler disable feature, allowing the user to disable the scrambler of the transmitter
and the descrambler of the receiver. The B1 is calculated (in transmitter and receiver) on the nonscrambled
data stream. This feature is per device.
s
s
s
s
s
s
Agere Systems Inc.
21
AGERE [ AGERE SYSTEMS ]
