BBT3821 Datasheet, PDF (67/75 Pages) Intersil Corporation – Octal 2.488Gbps to 3.187Gbps/ Lane Retimer

BBT3821
FIGURE 15. MDIO FRAME AND REGISTER TIMING
Read Operations Shown in Red
frame Prev Preamble ST OP Prt/Dev Ad TA Address/Data Idle/Preamble
MDIO (from STA)
MDC
MDIO (from MMD)
Register Contents
T_Preamble
T_Update
Old Data
New Data
MDIO
MDD Sourced
MDC
MDIO
STA Sourced
FIGURE 16. MDIO INTERFACE TIMING
STA Æ MMD
TA (for READ Ops)
MMD Æ STA
T_MDC
T_MDCD
T_MDH T_MDSU
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