SH7619_09 Datasheet, PDF (702/860 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7619 Series

Section 22 Ethernet Physical Layer Transceiver (PHY)
(3) Isolate Mode
The ordinary external PHY LSI has a ability to make PHY data paths electrically isolated from the
MII by setting register 0, bit 10 to a logic one.
But this PHY core is on-chip type so that this function is not supported.
(4) Link integrity Test
This PHY performs the link integrity test as outlined in the IEEE 802.3u (Clause 24-15) Link
Monitor state diagram. The link status is multiplexed with the 10Mbps link status to form the
reportable link status bit in Serial Management Register 1, and is driven to LINK LED.
The DSP indicates a valid MLT-3 waveform present on the RXP and RXM signals as defined by
the ANSI X3.263 TP-PMD standard, to the Link Monitor state-machine, using internal signal
called DATA_VALID. When DATA_VALID is asserted the control logic moves into a Link-
Ready state, and waits for an enable from the Auto Negotiation block. When received, the Link-
Up state is entered, and the Transmit and Receive logic blocks become active. Should Auto
Negotiation be disabled, the link integrity logic moves immediately to the Link-Up state, when the
DATA_VALID is asserted.
Note that to allow the line to stabilize, the link integrity logic will wait a minimum of 330 msec
from the time DATA_VALID is asserted until the Link-Ready state is entered. Should the
DATA_VALID input be negated at any time, this logic will immediately negate the Link signal
and enter the Link-Down state.
When the 10/100 digital block is in 10Base-T mode, the link status is from the 10Base-T receiver
logic.
(5) Power-Down modes
There is a power-down modes for the core:
• Power-Down
This power-down is controlled by register 0, bit 11. In this mode the entire PHY, except the
management interface, is powered-down and stays in that condition as long as bit 0.11 is
HIGH. When bit 0.11 is cleared, the PHY powers up and is automatically reset.
Rev. 6.00 Jul. 15, 2009 Page 662 of 816
REJ09B0237-0600