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2018.01
I. D-PHY vs C-PHY ?
1. CPHY vs DPHY Data Rate Comparison
TX HSTX # of pins Encoder Serializer BW
DPHY - 2 lane 3 6 0 2 (8 to 1) 2.5G*2 = 5Gbps
CPHY – 2 Trio 1 6 2 6 (7 to 1) 2.5G*2.28*2 =11.4Gbps
Less or similar current consumption in analog supply domain. (HS-TX, pre-driver)
Little higher current consumption in digital supply domain due to more circuits
& higher frequency. (encoder / serializer)
D-PHY, diff-pairs, source synchronous, no coding
C-PHY, 3-wire, embedded clock, 3-phase coding
2. D-PHY vs C-PHY Configuration
Data
Clock
Data
A
B
C
3. Compare of CPHY Eye-diagram
The encoding allows data to be sent ~2.28x faster than the signal transition rate
• e.g. a trio that changes at 10
9
times per second, can send data at ~2.28·10
9
bits per second
• ~2.28 bits are transmitted in the trio in every symbol
• Theoretical speed increase factor is log
2
(5) 2.3219
• Practical usable speed increase factor is 16/7 2.2857 [by sending 16 bits in 7 symbols]
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junglyfine
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