Dear David
I want to mention about this comments: PHY integration into an MCU may result too small a common mode range
Just automotive industry view, there are many system bus on in-vehicle network.
10SPE could replace CAN/CAN FD, Flexray,… . this means there is no need for many interface on MCU except Ethernet
And 10SPE could be mandatory for many of ECUs.
If MCU’s target for body/chassis/powertrain and low or mid function infotainment ECUs, PHY integration into MCU could
be reasonable options
< source from Dr. Kirsten Matheus, BMW, Hanser Automotive Networking 2015>
Best regards
DongOk kim
From: David D. Brandt [mailto:ddbrandt@xxxxxxxxxxxxxxx]
Sent: Monday, November 12, 2018 2:05 AM
To: STDS-802-3-10SPE@xxxxxxxxxxxxxxxxx
Subject: [802.3_10SPE] Comment #475, David Law
David,
You question the reason for 10BASE-T1S to define PMD and list the following potential reason:
The second would be to enable interoperable implementation of the PMD function as a separate instantiation from the PCS, PMA and other functions. To achieve this the PMD service interface (the
interface between the PMA and PMD) would be defined as a chip-to-chip compatibility interface, no mechanical connector would be specified. This would enable a 'system' (PCS, PMA, other functions) chip with a 'digital' interface to a 'driver' (PMD) chip. I
assume that this is the reason for providing a PMD sublayer for the 10BASE-T1S PHY.
My understanding is that PHY integration into an MCU may result too small a common mode range for many of the target applications, because a low voltage process (small geometry) is necessary for cost effective implementation
of the large amount of MCU logic. Similar non-Ethernet systems such as CAN and RS-485 implement a separate transceiver chip in a high voltage (large geometry) process to achieve adequate common mode range for more demanding environments. It would be useful
to maintain a similar option for 10BASE-T1S. Note that these transceivers are very simple and can have few pins.
Regards,
David D. Brandt
Senior Principal Engineer
Rockwell Automation - Advanced Technology
1201 South Second Street
Milwaukee, WI 53204-2496
414.382.4309
To unsubscribe from the STDS-802-3-10SPE list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-10SPE&A=1
To unsubscribe from the STDS-802-3-10SPE list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-10SPE&A=1