KSZ8721BLI Datasheet KSZ8721BL, KSZ8721BL-TR, KSZ8721BLI | P19-P21

Micrel, Inc. KS8721BL/SL

June 2009

M9999-062509-1.3

0h Basic Control Register

1h Basic Status Register

2h PHY Identiﬁer I

3h PHY Identiﬁer II

4h Auto-Negotiation Advertisement Register

5h Auto-Negotiation Link Partner Ability Register

6h Auto-Negotiation Expansion Register

7h Auto-Negotiation Next Page Register

8h Link Partner Next Page Ability

15h RXER Counter Register

1bh Interrupt Control/Status Register

1fh 100BASE-TX PHY Control Register

Address Name Description Default

(1)

Mode

0.15 Reset 1 = software reset. Bit is self-clearing RW/SC 0

0.14 Loop-Back

1 = loop-back mode

0 = normal operation

RW 0

0.13 Speed Select (LSB)

1 = 100Mbps

0 = 10Mbps

Ignored if Auto-Negotiation is enabled (0.12 = 1)

Set by

SPD100

0.12 Auto-Negotiation Enable

1 = enable auto-negotiation process (override 0.13 and 0.8)

0 = disable auto-negotiation process

Set by

NWAYEN

0.11 Power Down

1 = power-down mode

0 = normal operation

RW 0

0.10 Isolate

1 = electrical isolation of PHY from MII and TX+/TX-

0 = normal operation

RW Set by ISO

0.9 Restart Auto-Negotiation

1 = restart auto-negotiation process

0 = normal operation. Bit is self-clearing

RW/SC 0

0.8 Duplex Mode

1 = full-duplex

0 = half-duplex

Set by

DUPLEX

0.7 Collision Test

1 = enable COL test

0 = disable COL test

RW 0

0.6:1 Reserved RO 0

0.0

Disable

Transmitter

0 = enable transmitter

1 = disable transmitter

RW 0

1.15 100BASE-T4

1 = T4 capable

0 = not T4 capable

RO 0

1.14 100BASE-TX Full-Duplex

1 = capable of 100BASE-X full-duplex

0 = not capable of 100BASE-X full-duplex

RO 1

Micrel, Inc. KS8721BL/SL

June 2009

M9999-062509-1.3

Address Name Description Default

(1)

Mode

1.13 100BASE-TX Half-Duplex

1 = capable of 100BASE-X half-duplex

0 = not capable of 100BASE-X half-duplex

RO 1

1.12 10BASE-T Full-Duplex

1 = 10Mbps with full-duplex

0 = no 10Mbps with full-duplex capability

RO 1

1.11 10BASE-T Half-Duplex

1 = 10Mbps with half-duplex

0 = no 10Mbps with half-duplex capability

RO 1

1.10:7 Reserved RO 0

1.6 No Preamble

1 = preamble suppression

0 = normal preamble

RO 1

1.5 Auto-Negotiation Complete

1 = auto-negotiation process completed

0 = auto-negotiation process not completed

RO 0

1.4 Remote Fault

1 = remote fault

0 = no remote fault

RO/LH 0

1.3 Auto-Negotiation Ability

1 = capable to perform auto-negotiation

0 = unable to perform auto-negotiation

RO 1

1.2 Link Status

1 = link is up

0 = link is down

RO/LL 0

1.1 Jabber Detect

1 = jabber detected

0 = jabber not detected. Default is low

RO/LH 0

1.0 Extended Capability 1 = supports extended capabilities registers RO 1

2.15:0 PHY ID Number

Assigned to the 3rd through 18th bits of the organizationally

unique identiﬁer (OUI). Micrel’s OUI is 0010A1 (hex).

RO 0022h

3.15:0 PHY ID Number

Assigned to the 19th through 24th bits of the

organizationally unique identiﬁer (OUI). Micrel’s OUI is

0010A1 (hex).

RO 000101

3.9:4 Model Number Six bit manufacturer’s model number RO 100001

3.3:0 Revision Number Four bit manufacturer’s model number RO 1001

4.15 Next Page

1 = next page capable

0 = no next page capability

RW 0

4.14 Reserved RO 0

4.13 Remote Fault

1 = remote fault supported

0 = no remote fault

RW 0

4.12:11 Reserved RO 0

4.10 Pause

1 = pause function supported

0 = no pause function

RW 0

4.9 100BASE-T4

1 = T4 capable

0 = no T4 capability

RO 0

4.8 100BASE-TX Full-Duplex

1 = TX with full-duplex

0 = no TX full-duplex capability

Set by

SPD100 &

DUPLEX

4.7 100BASE-TX

1 = TX capable

0 = no TX capability

Set by

SPD100

4.6 10BASE-T Full-Duplex

1 = 10Mbps with full-duplex

0 = no 10Mbps full-duplex capability

Set by

DUPLEX

Micrel, Inc. KS8721BL/SL

June 2009

M9999-062509-1.3

Address Name Description Default

(1)

Mode

4.5 10BASE-T

1 = 10Mbps capable

0 = no 10Mbps capability

RW 1

4.4:0 Selector Field [00001] = IEEE 802.3 RW 00001

5.15 Next Page

1 = next page capable

0 = no next page capability

RO 0

5.14 Acknowledge

1 = link code word received from partner

0 = link code word not yet received

RO 0

5.13 Remote Fault 1 = remote fault detected; 0 = no remote fault RO 0

5.12 Reserved RO 0

5.11:10 Pause

5.10 5 .11

0 0

No PAUSE

0 1

Asymmetric PAUSE (link partner)

1 0

Symmetric PAUSE

1 1

Symmetric & Asymmetric PAUSE (local device)

RO 0

5.9 100 BASE-T4

1 = T4 capable

0 = no T4 capability

RO 0

5.8 100BASE-TX Full-Duplex

1 = TX with full-duplex

0 = no TX full-duplex capability

RO 0

5.7 100BASE-TX

1 = TX capable

0 = no TX capability

RO 0

5.6 10BASE-T Full-Duplex

1 = 10Mbps with full-duplex

0 = no 10Mbps full-duplex capability

RO 0

5.5 10BASE-T

1 = 10Mbps capable

0 = no 10Mbps capability

RO 0

5.4:0 Selector Field [00001] = IEEE 802.3 RO 00001

6.15:5 Reserved RO 0

6.4 Parallel Detection Fault

1 = fault detected by parallel detection

0 = no fault detected by parallel detection

RO/LH 0

6.3

Link Partner Next Page

Able

1 = link partner has next page capability

0 = link partner does not have next page capability

RO 0

6.2 Next Page Able

1 = local device has next page capability

0 = local device does not have next page capability

RO 1

6.1 Page Received

1 = new page received

0 = new page not yet received

RO/LH 0

6.0

Link Partner

Auto-Negotiation Able

1 = link partner has auto-negotiation capability

0 = link partner does not have auto-negotiation capability

RO 0

7.15 Next Page

1 = additional next page(s) will follow

0 = last page

RW 0

7.14 Reserved RO 0

7.13 Message Page

1 = message page

0 = unformatted page

RW 1

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P35

KSZ8721BLI

Mfr. #:

Buy KSZ8721BLI

Manufacturer:

Microchip Technology / Micrel

Description:

Ethernet ICs 10/100 BASE-TX/FX Physical Layer Transceiver

Lifecycle:

New from this manufacturer.

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KSZ8721BLI

KSZ8721BLI

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