IP101A VS RTL8201-Circuit

IP101/IP101A

Application Note

Confidential. 1/3 July 23, 2004

IP101/IP101A Features and Application Circuit Comparison

Comparison Table

IP101/IP101A

RTL8201BL

RTL8201CL

RTL8201CP

Remark

Auto

MDI/MDIX

Yes No No Yes Note1

Interrupt Yes No No No Note2

LED Display Mode0 & Mode1 (Default & 8201BLs’.) Mode0 &

Mode1

(Compatiblewith

8201BLs’.)

Mode0 &

Mode1 (Compatible with 8201BLs’.)

Note3

Pin 1 (COL) IP101A,

1: RMII/ 0:MII

IP101,

1:Test mode/ 0: MII

-- 1: LED mode 1, 8201BL compatible 0: LED mode 0, 8201BL non-compatible Figure 3

BandGap

resistor 6.2K (1%) 5.9K (1%) 2K (1%) 2K (1%) Figure 1

Rx/Tx CenterTap of xformer Connected to Pin 32 TX CT: N.C

RX CT:0.1uF to

GND Connected to Pin 32 Connected to Pin

Figure 2Internal

regulator

output Pin 32 / 2.5v. Pin 32 / 2.5v. Pin 32 / 1.8v. Pin 32 / 1.8v. Note4

*Note 1: If Auto-MDIX function of IP101/IP101A or RTL8201CP is, it is recommended to use the transformer

supporting Auto-MDIX.

*Note 2: If Speed, Duplex, Link, or AN state changes, IP101/101A issues an interrupt .

*Note 3: Normally, IP101/101A LED mode 1 (default) is same as RTL8201BL. RTL8201CL/CP LED mode is

different from RTL8201BL. It provides an option to change LED mode to be compatible with RTL8201BL by pull high pin 1 with a resistor. But this pull high resistor should NOT be used with IP101 for normal (MII Interface) operation. (See the Figure 3). LED functions are listed on the last page.

*Note 4: If there is a power supply on the system directly connecting to this pin (not necessary, not suggested), it

has to be 2.5V(For IP101/IP101A) or 1.8V.

IP101/IP101A

Application Note

Confidential. 2/3 July 23, 2004

Figure 1

Figure 2

RTL8201CL/CP=>1.8V

Note for Figure 2: For some transformer models, CT pins are shorted internally. If this kind of model is used, there is only one CT pin tied to pin 32 of IP101/IP101A. But, this kind of transformer only could not be used on RTL8201BL. Most of the transformer venders are willing to modify their transformer model with CT short by request.

IP101/IP101A

Application Note

Confidential. 3/3 July 23, 2004

Reference:

LED function

IP101/101A

(LED mode1, default)

RTL8201BL RTL8201CL/CP (Pin 1 pulled high)

RTL8201CL/CP (Pin 1 Not pulled high) Pin 9 (Link) Light on when link

Light on when link Pin 10 (Duplex) Light on when full duplex operation Light on when full duplex

operation

Pin 12 (10M) Light on when link in 10M; Blinking when 10M Tx/Rx occur

Blinking when 10M Tx/Rx occur Pin 13 (100M) Light on when link in 100M; Blinking when 100M Tx/Rx occur

Blinking when 100M Tx/Rx

occur

Pin 15 (Col) Blinking when collision occur Blinking when collision occur

Figure 3

IP101A : In MII mode, R27(NC), R28(NC/5.1K ohm)

In RMII mode, R27(5.1K ohm)

R28 is reserved for avoiding CPU or MAC to drive COL to

high, that will set IP101 to test

mode,IP101A to RMII mode.

R27 is reserved for 8201CL/CP LED Mode Change to compatible with 8201BL

RTL8201CL/CP : R27(5.1K ohm)

RTL8201BL : R27(NC)

IP101 : In MII mode ,R27(NC),

R28(NC/5.1K ohm)

In Test mode ,R27(5.1K ohm)