IEEE P802.3ae MDC/MDIO
IEEE P802.3ae MDC/MDIO
IEEE P802.3ae MDC/MDIO
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<strong>IEEE</strong> <strong>P802.3ae</strong> <strong>MDC</strong>/<strong>MDIO</strong><br />
Ed Turner – Clause 45 editor (<strong>MDIO</strong> interface)<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
ed.turner@latticesemi.com<br />
David Law – Clause 30 editor (Management)<br />
david_law@eur.3com.com<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 1<br />
Slide 1
Copenhagen, Denmark Sept 17-19, 2001<br />
Presentation purpose<br />
• Explain what the <strong>MDIO</strong> interface is<br />
– For those not familiar with 802.3<br />
• Explain what we have changed and<br />
added to the <strong>MDIO</strong> interface in 802.3ae<br />
– For those who are familiar with 802.3 but<br />
have not been participating in 802.3ae<br />
• Explain how <strong>MDIO</strong> fits with 802.3ae link<br />
status and fault reporting<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 2<br />
Slide 2
Copenhagen, Denmark Sept 17-19, 2001<br />
What is <strong>MDIO</strong> for ?<br />
‘..a simple, two-wire, serial interface to<br />
connect a management entity and a<br />
managed PHY for the purposes of<br />
controlling the PHY and gathering<br />
status from the PHY.’<br />
(Clause 22.2.4)<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 3<br />
Slide 3
Copenhagen, Denmark Sept 17-19, 2001<br />
<strong>MDIO</strong> signals<br />
• <strong>MDC</strong> (Management Data Clock)<br />
sourced continuously from STA (station<br />
management entity)<br />
• <strong>MDIO</strong> (Management Data Input/Output)<br />
bi-directional multi-drop bus<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 4<br />
Slide 4
Clause 22 <strong>MDIO</strong> : Up to 32 PHYs<br />
STA<br />
MAC<br />
1<br />
PHY<br />
MDI Port 1<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
(G)MII (G)MII<br />
<strong>MDIO</strong><br />
<strong>MDC</strong><br />
Up to 32 registers (16 bit)<br />
per PHY<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
MAC<br />
32<br />
PHY<br />
MDI Port 32<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 5<br />
Slide 5
Copenhagen, Denmark Sept 17-19, 2001<br />
Clause 22 <strong>MDIO</strong><br />
• PHY status and control<br />
– Link status<br />
– Speed ability and selection<br />
– Power down for low power consumption<br />
– Duplex mode (full / half)<br />
– Control of auto-negotiation<br />
– Fault signalling<br />
– Loopback<br />
• 2.5MHz <strong>MDC</strong> speed<br />
– 39 000 registers per second<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 6<br />
Slide 6
ST<br />
ST = 01<br />
OP<br />
01<br />
10<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
<strong>MDIO</strong> frame format<br />
OP PHYADR<br />
Access<br />
Type<br />
Read<br />
Write<br />
REGADR TA<br />
DATA<br />
5 bits 5 bits 2 bits 16 bits<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
Driven by STA for write,<br />
Driven by PHY for read<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 7<br />
Slide 7
Issues with Clause 22 <strong>MDIO</strong><br />
• Not enough registers for future use<br />
– Only 4 left unallocated<br />
• Electrical interface requires 5V<br />
tolerance<br />
• Does not cater for multi-device PHYs<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 8<br />
Slide 8
Copenhagen, Denmark Sept 17-19, 2001<br />
10GbE adopted proposal<br />
• Use spare ST (start of frame) code (00)<br />
– Define new indirect addressing register access<br />
– Applicable to ST code 00 only<br />
– Access consists of a Address cycle followed by a<br />
Read or Write cycle<br />
• Provides many more registers<br />
– 32 ports as at present<br />
– 32 MMDs per port (<strong>MDIO</strong> Manageable Device)<br />
– 65 536 registers per device<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 9<br />
Slide 9
OP<br />
00<br />
01<br />
11<br />
10<br />
ST<br />
ST = 00<br />
10GbE indirect addressing<br />
Access Type<br />
OP PHYADR<br />
Address<br />
Write<br />
Read<br />
Post Read Inc Addr<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
Value<br />
00000<br />
00001<br />
00010<br />
00011<br />
00100<br />
00101<br />
-------<br />
DEVTYPE<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
TA<br />
Device Access<br />
Type<br />
Reserved<br />
PMD/PMA<br />
WIS<br />
PCS<br />
PHY XS<br />
DTE XS<br />
--------------<br />
ADDRESS/DATA<br />
Address<br />
Write<br />
Read<br />
Read Inc<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 10<br />
Contents<br />
Address<br />
Write Data<br />
Read Data<br />
Read Data<br />
Slide 10
10GbE indirect addressing example<br />
ST<br />
00<br />
OP = Address<br />
ST<br />
00<br />
OP<br />
00<br />
OP<br />
11<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
PHYADR<br />
0 0000<br />
PHYADR<br />
0 0000<br />
DTYPE<br />
0 0001<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
TA<br />
ADDRESS<br />
0000 0100 1001 0001<br />
Device Type = PMD Address to be accessed<br />
DTYPE<br />
0 0001<br />
OP = Read Device Type = PMD<br />
TA<br />
DATA<br />
0000 0100 1001 0001<br />
Data returned<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 11<br />
Slide 11
STA<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
10GbE <strong>MDIO</strong> devices<br />
MAC<br />
1<br />
DTE<br />
XGXS<br />
PHY<br />
XGXS<br />
PCS<br />
WIS<br />
PMA<br />
PMD<br />
<strong>MDIO</strong><br />
<strong>MDC</strong><br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
MAC<br />
32<br />
DTE<br />
XGXS<br />
PHY<br />
XGXS<br />
PCS<br />
WIS<br />
PMA<br />
PMD<br />
Up to 65 536 registers per device<br />
MDI Port 1<br />
MDI Port 32<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 12<br />
Slide 12
What can the registers do ?<br />
• All status and control<br />
– Link status, speed, power down, fault,<br />
loopback<br />
– PMD capabilities (wavelength, loopback)<br />
– WIS registers<br />
– PCS error counters, test patterns<br />
– XGXS status and control (XAUI)<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 13<br />
Slide 13
Fault signalling and link status<br />
• Logic in the previously logic-free RS<br />
– http://www.ieee802.org/3/ae/public/nov00/taborek_2_1100.pdf<br />
• Only the RS can generate RF codes<br />
• Other devices in the link can generate LF<br />
codes and must propagate LF codes or RF<br />
codes<br />
– A LF condition overrides a received RF code<br />
• An RS that receives an LF code generates<br />
an RF code on the transmit path<br />
• An RS that receives an RF code generates<br />
IDLE on the transmit path<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 14<br />
Slide 14
Fault signalling and link status<br />
• <strong>MDIO</strong> used to interrogate devices when an<br />
RF code or LF code is received by the RS<br />
– Check transmit path for a received RF<br />
– Check receive path for a received LF<br />
• Can only interrogate local devices !<br />
– Transmission of RF code will trigger a far end<br />
interrogation<br />
• Link status can also be checked on a deviceby-<br />
device basis<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 15<br />
Slide 15
Remote<br />
Fault<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
Fault signalling example<br />
MAC 1 MAC 2<br />
RS RS<br />
DTE<br />
XGXS<br />
PHY<br />
XGXS<br />
PCS<br />
WIS<br />
PMA<br />
PMD<br />
Local<br />
Fault<br />
PCS fault on<br />
receive path<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
Idle<br />
DTE<br />
XGXS<br />
PHY<br />
XGXS<br />
PCS<br />
WIS<br />
PMA<br />
PMD<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 16<br />
Remote<br />
Fault<br />
Slide 16
Remote<br />
Fault<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
Fault signalling example<br />
MAC 1 MAC 2<br />
RS RS<br />
DTE<br />
XGXS<br />
PHY<br />
XGXS<br />
PCS<br />
WIS<br />
PMA<br />
PMD<br />
Local<br />
Fault<br />
PCS fault on<br />
transmit path<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
Idle<br />
DTE<br />
XGXS<br />
PHY<br />
XGXS<br />
PCS<br />
WIS<br />
PMA<br />
PMD<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 17<br />
Remote<br />
Fault<br />
Slide 17
XGMII<br />
XAUI<br />
MDI<br />
DTE XS<br />
PHY XS<br />
PCS<br />
PMA<br />
PMD<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
10GbE loopbacks<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
Mandatory<br />
Optional<br />
Mandatory for 10GBASE-R<br />
Not present for 10GBASE-X<br />
Optional for 10GBASE-R<br />
Mandatory for 10GBASE-X<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 18<br />
Slide 18
10GbE electrical specification<br />
• VDD = 1.2V typical<br />
• Possible to use open drain drivers<br />
Parameter<br />
VI<br />
VIH<br />
VIL<br />
VOH<br />
VOL<br />
IO<br />
Copenhagen, Denmark Sept 17-19, 2001<br />
Minimum<br />
-0.3V<br />
0.84V<br />
1.0V<br />
-0.3V<br />
4mA<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
Maximum<br />
1.5V<br />
0.36V<br />
1.5V<br />
0.2V<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 19<br />
Slide 19
Copenhagen, Denmark Sept 17-19, 2001<br />
10GbE <strong>MDIO</strong><br />
• Backwards compatibility<br />
– Possible to integrate a Clause 22 PHY into<br />
a Clause 45 MMD and use the new<br />
electrical interface with the old frame<br />
format<br />
• Optional<br />
– Not mandatory to implement <strong>MDIO</strong> – could<br />
provide access to registers using another<br />
interface<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 20<br />
Slide 20
Copenhagen, Denmark Sept 17-19, 2001<br />
Summary<br />
• New Indirect Address register access defined<br />
for 10GbE<br />
• Opens up many more registers<br />
– 32 Ports<br />
– 32 MMDs per port<br />
– 65 536 Registers per MMD<br />
• End-to-end fault signalling<br />
– Detailed diagnosis via register accesses<br />
• Multiple loopback points defined<br />
• New low voltage electrical specification<br />
<strong>IEEE</strong> 802.3ah<br />
Task Force<br />
May <strong>IEEE</strong> 4, <strong>P802.3ae</strong> 2000 <strong>MDC</strong>/<strong>MDIO</strong> Slide – V1.0 21<br />
Slide 21
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