DS92LX2121SQE National Semiconductor, DS92LX2121SQE Datasheet - Page 29

• Manufacturer Part Number: DS92LX2121SQE
• Description: SERDES, 10-50MHZ, 40LLP
• Manufacturer: National Semiconductor

Specifications of DS92LX2121SQE

• Data Rate: 1.05Gbps
• No. Of Inputs: 21
• No. Of Outputs: 1
• Supply Voltage Range: 1.71V To 1.89V
• Driver Case Style: LLP
• No. Of Pins: 40
• Base Number: 2121
• Operating Temperature Range: -40°C To +85°C
• Serdes Function: Serializer
• Ic Input Type: LVCMOS
• Ic Output Type: LVCMOS
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

GENERAL PURPOSE I/O (GPIO)
The DS92LX2121 / DS92LX2122 has up to 4 GPO and 4 GPI
on the Serializer and Deserializer respectively. The GPI/GPO
maximum switching rate is up to 66 kHz for communication
between Deserializer GPI to Serializer GPO.
AT-SPEED BIST (BISTEN, PASS)
An optional AT SPEED Built in Self Test (BIST) feature sup-
ports at speed testing of the high-speed serial and the back-
channel link. Control pins allow the system to initiate the test
and set the duration. A HIGH on PASS pin indicates that all
payloads received during the test were error free during the
FIGURE 25. GPIO Delta Latency
29
BIST duration test. A LOW on this pin at the conclusion of this
test indicates that one or more payloads were detected with
errors.
The BIST duration is defined by the width of BISTEN. BIST
starts when BISTEN goes HIGH. BIST ends when BISTEN
goes LOW. PASS flag will go HIGH when no errors detected
after BIST Duration completes. Any errors detected after the
BIST Duration are not included in PASS logic.
The following diagram shows how to perform system AT
SPEED BIST:
30125154
www.national.com