Note (1): These 1-byte register values are merely copied by the ISL35822 from the I2C address space on Power-up or RESET, or on any DOM read operation. If the ‘Indirect
DOM Enable’ bit (Register bit 1.C018’h.2 Table 51) is not set, a four-lane external DOM device is expected to determine the values for these registers, according
Section 11.3 in the XENPAK MSA Rev 3.0 specification. A single one-lane DOM device system will provide the values from the single DOM device here. If the
‘Indirect DOM Enable’ bit is set, the values from the “Representative” (as defined by Register bits 1.C018’h.1:0 in Table 51), lane DOM are entered here.
Note (1): User writes to these bits are not valid unless the Command Status is Idle. The Command Status will not return to Idle until being read after command
completion (either Succeed or Failed).
Note (2): At the end of a hardware RESETN or a register 1.0.15 RESET operation, if the XP_ENA pin is asserted, and the DOM control bits are set in 1.32890 (1.807A),
the ISL35822 will automatically begin a ‘Periodic update, fastest rate read’ operation.
Note (3): The rates of the periodic reads are determined by bits 4:3 of register 1.49176 (1.C018’h), see Table 51.
VENDOR-SPECIFIC PMA/PMD AND GPIO REGISTERS (1.C001’H TO 1.C01D’H)