11 | Keysight | U7238C and U7238D MIPI D-PHY Conformance Test Software - Data Sheet
Measurement Requirements
To use the D-PHY conformance software you will need a Keysight Infiniium Series oscilloscope
with at least 4 GHz of analog, real-time bandwidth. In order to use the D-PHY conformance
test software, your product will need to be able to source the necessary low-power (LP) to
high-speed (HS) data transitions needed to perform the testing.
Tests Performed
The D-PHY conformance software performs the following tests as per MIPI Alliance
Specification for D-PHY v1.2, section 9 and D-PHY CTS v1.2, section 1.
MIPI D-PHY CTS section 1, TX timers and signaling
Global operation data and clock TX measurements
High-speed data and clock measurements
– TLPX
– HS data and clock TX static common-mode voltage
(VCMTX)
– LP exit: Data TX THS-prepare
– LP exit: Data TX THS-prepare+THS-zero
– HS exit: Data TX THS-trail
– HS exit: Data TX TEOT
– HS exit: Data TX THS-exit
– LP exit: Clock TX THS-exit
– LP exit: Clock TX TLPX
– LP exit: Clock TX TCLK-prepare
– LP exit: Clock TX TCLK-prepare+TCLK-zero
– LP exit: Clock TX TCLK-PRE
– LP exit: Clock TX TCLK-trail
– LP exit: Clock TC TX TEOT
– HS data and clock TX VCMTX mismatch (ΔVCMTX(1,0)
– HS data and clock TX differential voltage (VOD)
– HS data and clock TX differential voltage mismatch (ΔVOD)
– HS data and clock TX single-ended output high voltage
(VOHHS)
– HS data and clock TX common-level variations above 450
MHz (VCMTX(HF))
– HS data and clock TX common-level variations between
50-450 MHz (VCMTX(LF))
– HS data and clock TX 20%-80% rise time (tR)
– HS data and clock TX 20%-80% fall time (tF)
– HS clock instantaneous (UI INST)
HS data-clock timing
Low-power data measurements
– HS clock instantaneous
– HS clock rising edge alignment to first payload bit
– Data-to-clock skew (TSKEW(TX))
– LP TX Thevenin output high voltage level (VOH)
– LP TX Thevenin output low voltage (VOL)
– LP TX 15 to 85% rise time (tRLP)
– LP TX 15 to 85% fall time (tFLP)
– LP TX 30 to 85% post-EoT rise time (tREOT)
– LP TX pulse width of LP TX exclusive-OR clock
(TLP-PULSE-TX)
– LP TX period of LP TX exclusive-OR clock (TLP-PER-TX)
– LP TX slew rate vs. CLOAD
Table 1. MIPI D-PHY electrical conformance tests performed by the software.
KEYSIGHT [ Keysight Technologies ]
