MIC2358 Datasheet, PDF (17/29 Pages) Micrel Semiconductor – IEEE 802.3af Octal Power Sourcing Equipment Controller

Micrel, Inc.
MIC2358YLQ
Register Definitions
Purpose
The MIC2358YLQ uses write registers to configure the
operation of the device and read registers to supply
information about the operation of the device. These
registers are accessed through the SMBus interface.
Register Map
The SMBus can address 128 individual registers, as
shown in Table 1. Each port has eight assigned
registers: four that have read/write access, three that
are read only, and one that is read only and is cleared
after being read. There are 11 global registers: six
read/write and five read only. The remaining registers
are reserved for factory testing purposes. These test
registers may be read without harm, but should not be
written. The test register definitions are not included in
this document.
Table 2 shows the internal structure of the registers
assigned to each port. Table 3 shows the internal
structure of the global registers.
Global registers affect all ports. Port registers affect
individual ports only.
The remainder of this document explains in detail the
use of each register, and if appropriate the meaning and
use of individual bits within a register.
Conventions
Throughout this document, SMBus registers are
referenced using BOLD_UPPERCASE. Individual bits
within a register are referenced using italic_lowercase.
States from the state machine diagram are shown in
Figure 33-6 of the IEEE std 802.3af are written using
REGULAR_UPPERCASE.
July 2010
17
M9999-070810