U4305B Datasheet, PDF (8/20 Pages) Keysight Technologies – Protocol Exerciser for PCI Express® 3.0

08 | Keysight | U4305B Protocol Exerciser for PCI Express^® 3.0 - Data Sheet
U4305B-LT3 LTSSM Testing
As an LTSSM tester
The Link Training and Status State Machine (LTSSM) is the sub-block that drives and
controls the link initialization and training process for a PCIe device to enable the normal
data exchange between PCIe nodes on the link. LTSSM operates at the physical layer
and exchanges physical layer packets (Ordered sets such as TS1 and TS2) to initialize,
train, and manage the link. LTSSM features are provided when option LT3 is purchased.
The Keysight U4305B Exerciser provides positive and negative test cases to exercise
critical functions of either the end node (adaptor card) or root complex (motherboard or
blade). These test cases can force either DUT target devices into various LTSSM states,
verify the state transitions, and timeout implementations, and report the test case
results as either Passed or Failed.
LTSSM physical layer test features
–– Supports six way speed change from any of the three speeds to any of the three
speeds
–– When programmed as an Upstream Component (USC), supports going to Gen3
speed with all phases of equalization (0 through 3), only phase 1, or without
equalization
–– When programmed as a Downstream Component (DSC), it follows USC in equaliza-
tion process
–– Supports automatic or manual enabling/disabling of the lane reversal feature
–– Supports independent lane polarity inversion setting for all the lanes
–– Supports physical link widths x1, x2, x4, x8, and x16. Link width is fixed and is
specified when ordering
–– Supports option to enable/disable scramble modes for Gen1 and Gen2 speeds
–– Supports all possible SKIP ordered sets (OS) at transmitter for all three speeds
–– Can replace STP/END of a transmitted packet by programmable character at Gen1
and Gen2 speeds. Can corrupt FCRC of STP Token at Gen3 speed
–– Supports programmable Transceiver Settings covering a wide range of transmitted
signal amplitude and emphasis levels
–– Supports programmable Equalization settings sent in Transition Ordered Sets
(TS OS) to request the DUT to transmit at various signal amplitude and emphasis
levels