ADIN1100CCPZ-R7 datasheet(15/80 Pages) AD

15 / 80 page

Data Sheet

ADIN1100

THEORY OF OPERATION

analog.com

Rev. B | 15 of 80

Hardware Configuration

The ADIN1100 can be configured to prefer slave or prefer master

through the RXD_1/MS_SEL hardware configuration pin. The rec-

ommendation is to select prefer slave or prefer master (see the

Master/Slave Preference section). If autonegotiation is disabled,

the MS_SEL hardware configuration pin signal sets the default

master/slave selection. The ADIN1100 is configured in prefer slave

by default if the pin is left floating (internal pull-down resistor).

Software Configuration

The master and slave configuration bit (CFG_MST) is automatically

updated after power-up, hardware reset, or software reset based on

the MS_SEL hardware configuration pin signal level. This bit is only

used when autonegotiation is disabled. Otherwise, this bit is set or

reset during the autonegotiation process (see the Autonegotiation

section).

AUTONEGOTIATION

The ADIN1100 uses the autonegotiation capability in accordance

with IEEE 802.3 Clause 98, providing a mechanism for exchanging

information between the local device and link partners to agree to

a common mode of operation. Single twisted pair autonegotiation

is performed using differential Manchester encoding (DME) pages

exchanged between the local device and its link partner. At a high

level, the autonegotiation provides the following functions:

►

Transmit

►

Receive

►

Half duplex

►

Arbitration

During the autonegotiation process, the local device advertises its

own capabilities and compares them to those received from the

link partner. The arbitration mechanism defines the operating mode

selected so that the transmit amplitude mode and master/slave

selection are configured for the linked devices.

If the link is dropped, the autonegotiation process restarts automat-

ically. An autonegotiation restart can also be requested by writing

to the autonegotiation restart bit (AN_RESTART) in the autonego-

tiation control register (AN_CONTROL).

The autonegotiation process can take time to complete, depending

on the number of pages exchanged, but is always the fastest way

to bring up a link. Clause 98 of the IEEE 802.3 standard details the

sequence timers and DME pages timing related to autonegotiation.

Autonegotiation is enabled by default for the ADIN1100, and it is

strongly recommended to always keep it enabled.

Transmit Amplitude Advertisement

High Voltage Transmit Ability Advertisement

The B10L_TX_LVL_HI_ABLE bit configures the default values for

the autonegotiation advertisement parameters. This bit is read only

and configured based on the TX2P4_EN hardware configuration pin

signal as described in the Transmit Amplitude section. The transmit

amplitude advertisement parameters are defined with the following

bits:

►

AN_ADV_B10L_TX_LVL_HI_ABL: advertisement of the

10BASE-T1L high level transmit operating mode ability bit

►

AN_ADV_B10L_TX_LVL_HI_REQ: advertisement of the

10BASE-T1L high level transmit operating mode request bit

►

B10L_TX_LVL_HI: 10BASE-T1L transmit voltage amplitude con-

trol bit

Table 9. AN_ADV_B10L_TX_LVL_HI_ABL Settings

Bit Setting

Description

Support 1.0 V p-p transmit level only

Support both 1.0 V p-p and 2.4 V p-p transmit level

Table 10. AN_ADV_B10L_TX_LVL_HI_REQ Settings

Bit Setting

Description

Request 1.0 V p-p transmit level

Request 2.4 V p-p transmit level

High Voltage Transmit Level Request

The ADIN1100 can be configured to advertise a request

for the 2.4 V p-p transmit level using the 10BASE-T1L

high level transmit operating mode ability advertisement bit

(AN_ADV_B10L_TX_LVL_HI_ABL). Note that the 2.4 V p-p trans-

mit level must be enabled using the TX2P4_EN hardware configu-

ration pin signal to enable the high voltage request advertisement.

Link Partner Transmit Level Advertisement

The high level transmit information advertised from the link partner

can be read using the following bits:

►

AN_LP_ADV_B10L_TX_LVL_HI_ABL: Link Partner 10BASE-T1L

high level transmit operating mode ability

►

AN_LP_ADV_B10L_TX_LVL_HI_REQ: Link Partner 10BASE-

T1L high level transmit operating mode request

These bits are updated during the autonegotiation process and

are valid when the autonegotiation complete register bit (AN_COM-

PLETE) is set.

ADIN1100CCPZ-R7 数据表(PDF) 15 Page - Analog Devices

ADIN1100CCPZ-R7 数据表(HTML) 15 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

数据表下载