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The method to connect 2 Davicom devices without transformers

IC 1	IC 2	Reference Circuit	AVDD_1	AVDD_2
DM9000A	DM9000A	1	2.5V	2.5V
DM9000A	DM9000B	2	2.5V	1.8V
DM9000B	DM9000B	1	1.8V	1.8V
DM9161A	DM9161A	1	2.5V	2.5V
DM9161A	DM9161B	2	2.5V	1.8V
DM9161B	DM9161B	1	1.8V	1.8V

 

Reference Circuit 1

Reference Circuit 2

 

 

Power Management of Davicom ICs

Power Reduced Mode: PHY Reg. 10H.4

Power Down Mode: PHY Reg. 00H.11 or MAC Reg. 1FH.0

Stop Internal System Clock: MAC Reg. 50H.0

 

	System Clock	MAC	PHY
			TX	RX
Power Reduced Mode (PHY Reg. 16.4)	On	On	Off	On
Power Down Mode (PHY Reg. 0.11/MAC Reg. 1FH.0)	On	On	Off	Off
System Clock Off (MAC Reg. 50H.0)	Off	Off	On	On
Power Down Mode (system clock off)	Off	Off	Off	Off

 

DM9000 Series Power comparison list

Item	DM9000	DM9000A	DM9000B	SMSC LAN9211	Asix AX88796B
Pin counts	100	48	48	56	64
PHY Type	Analog	Analog	DSP	DSP	NA
Power Consumption (mW)
100Base-TX	330	287.1	429	514	495
10Base-T	280.5	303.6	561	578	462
10Base-T (power saving)	NA	NA	528	NA	NA
10Base-T Idle	145.2	125.4	198 (power saving)	569	448 (power saving)
Auto-Negotiation	198	184.8	198	NA	587
Power Reduce Mode	66	102.3	NA	NA	NA
Power Down Mode	NA	69.3	NA	61	140
Power Down Mode (system clock off)	33	23.1	66	10	0.9

 

DM9161 series Power comparison list

Item	DM9161E	DM9161A	DM9161B	SMSC LAN8187	SMSC LAN8700	Realtek RTL8201DL
Pin counts	48	48	48	64	36	48
PHY Type	Analog	Analog	DSP	DSP	DSP	DSP
Auto-MDIX	No	Yes	Yes	Yes	Yes	Yes
Power Consumption (mW)
100Base-TX	290.4	303.6	429	246.84	246.84	346.5
10Base-T	231 (50%)	237.6 (50%)	554.4	122.1	122.1	429
10Base-T (power saving)	NA	NA	201.3	83.88	83.88	NA
10Base-T Idle	99	82.5	NA	NA	NA	82.5
Auto-Negotiation	148.5	171.6	191.4	NA	NA	NA
Power Reduced Mode (without cable)	59.4	82.5	NA	NA	NA	NA
Power Down Mode (system clock off)	9.9	12.54	56.1	10.13	10.131	56.1

 

DM9161E/DM9161A/DM9161B比較表

Pin difference between DM9161 series

Pin	DM9161E	DM9161A	DM9161B
1, 2, 9	3.3V Power in	2.5 Power out	1.8V Power out
39	DVDD	DISMDIX	DISMDIX

Application: For DM9161E, pin 1, 2, 9 and 39 connects to DVDD, 3.3V directly. For DM9161A and DM9161B, pin 1, 2 and 9 are bound together to provide transformer center tap a bias voltage. The hardware design on DM9161A and DM9161B is the same.

Register difference between DM9161 series

Register	Name	DM9161E	DM9161A	DM9161B
1 (w/o link)	Basic Mode Status Register	7809	7849	7849
3	PHY ID Identifier Register #2	b880	b8a0	b8b0
20	Specified Config Register	Reserved	0080/0000	0080/0000
24 (EVB)	Davicom Hardware Reset Latch State Register	14e1	e4e1	e4e1
28		Reserved	Reserved	0003
29	Power Saving Control Register	Reserved	Reserved	0000

Application: If customer will check register 3 to validate PHY working or not, DM9161 series has different value for each version.

DM9000A/DM9000B比較表

Pin difference between DM9000A and DM9000B

Pin	DM9000A	DM9000B
2, 9	2.5V Power out	1.8V Power Out

Application: For pin difference between 2.5V and 1.8V, the board is not need to be modified.

MAC Register difference between DM9000A and DM9000B

Register	Name	DM9000A	DM9000B
2CH	Chip Revision Register	19	1A

EEPROM

No difference

PHY Register difference between DM9000A and DM9000B

Register	Name	DM9000A	DM9000B
03	PHY ID Identifier Register #2	B8A0	B8B0
28		Reserved	0003

Application: If the boot loader or driver from customer will check the MAC register 2CH or PHY register 03 to distinguish the IC is working or not, this should be carefully exam if the board can work on DM9000A but can't get DM9000B.

CISPR 22

來源網址


CISPR 22: 1997 Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement

Definitions

Information technology equipment (ITE)

Any equipment:

1. which has a primary function of either (or a combination of) entry, storage, display, retrieval, transmission, processing, switching, or control, of data and of telecommunication messages and which may be equipped with one or more terminal ports typically operated for information transfer;
2. with a rated supply voltage not exceeding 600V.

It includes, for example, data processing equipment, office machines, electronic business equipment and telecommunication equipment.

Any equipment (or part of the ITE equipment) which has a primary function of radio transmission and/or reception according to the ITU Radio Regulations are excluded from the scope of CISPR 22.

Note – Any equipment which has a function of radio transmission and/or reception according to the definitions of the ITU Radio Regulations should fulfil the national radio regulations, whether or not this publication is also valid.

Equipment, for which all disturbance requirements in the frequency range are explicitly formulated in other IEC or CISPR publications, are excluded from the scope of this publication.

Telecommunication ports

Ports which are intended to be connected to telecommunication networks (e.g. public switched telecommunication networks, integrated services digital networks), local area networks (e.g. Ethernet, Token Ring) and similar networks.

Classification of ITE

ITE is subdivided into two categories denoted class A ITE and class B ITE.

Class B ITE

Class B ITE is a category of apparatus which satisfies the class B ITE disturbance limits.

Class B ITE is intended primarily for use in the domestic environment and may include:

	Equipment with no fixed place of use; for example, portable equipment powered by built-in batteries;
	Telecommunication terminal equipment powered by a telecommunication network;
	Personal computers and auxiliary connected equipment.

Note – The domestic environment is an environment where the use of broadcast radio and television receivers may be expected within a distance of 10 m of the apparatus concerned.

Class A ITE

Class A ITE is a category of all other ITE which satisfies the class A ITE limits but not the class B ITE limits. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use:

Warning

This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

Limits for conducted disturbance at mains terminals and telecommunication ports.

The equipment under test (EUT) shall meet the limits in tables 1 and 3 or 2 and 4, as applicable, including the average limit and the quasi-peak limit when using, respectively, an average detector receiver and quasi-peak detector receiver and measured in accordance with the methods described in clause 9 of CISPR 22. Either the voltage limits or the current limits in table 3 or 4, as applicable, shall be met except for the measurement method of C.1.3 of CISPR 22 where both limits shall be met. If the average limit is met when using a quasi-peak detector receiver, the EUT shall be deemed to meet both limits and measurement with the average detector receiver is unnecessary.

If the reading of the measuring receiver shows fluctuations close to the limit, the reading shall be observed for at least 15 s at each measurement frequency; the higher reading shall be recorded with the exception of any brief isolated high reading which shall be ignored.

Table 1 – Limits for conducted disturbance at the mains ports of class A ITE

Frequency range MHz	Limits dB(m V)
	Quasi-peak	Average
0.15 to 0.50	79	66
0.50 to 30	73	60
Note – The lower limit shall apply at the transition frequency.

Table 2 – Limits for conducted disturbance at the mains ports of class B ITE

Frequency range MHz	Limits dB(m V)
	Quasi-peak	Average
0.15 to 0.50	66 to56	56 to 46
0.50 to 5	56	46
5 to 30	60	50
Note 1 – The lower limit shall apply at the transition frequency. Note 2 – The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz

Table 3 – Limits of conducted common mode (asymmetric mode) disturbance at telecommunication ports in the frequency range 0.15 MHz to 30 MHz for class A equipment

Frequency range MHz	Voltage limits dB(m V)		Current limits dB(m A)
	Quasi-peak	Average	Quasi-peak	Average
0.15 to 0.50	97 to 87	84 to 74	53 to 43	40 to 30
0.50 to 30	87	74	43	30
Note 1 – The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz Note 2 – The current and voltage disturbance limits are derived for use with an impedance stabilization network (ISN) which presents a common mode (asymmetric mode) impedance of 150 W to the telecommunication port under test (conversion factor is 20 log 10 150 / I = 44 dB).

Table 4 – Limits of conducted common mode (asymmetric mode) disturbance at telecommunication ports in the frequency range 0.15 MHz to 30 MHz for class B equipment

Frequency range MHz	Voltage limits dB(m V)		Current limits dB(m A)
	Quasi-peak	Average	Quasi-peak	Average
0.15 to 0.50	84 to 74	74 to 64	40 to 30	30 to 20
0.50 to 30	74	64	30	20
Note 1 – The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz Note 2 – The current and voltage disturbance limits are derived for use with an impedance stabilization network (ISN) which presents a common mode (asymmetric mode) impedance of 150 W to the telecommunication port under test (conversion factor is 20 log 10 150 / I = 44 dB). Note 3 – Provisionally, a relaxation of 10 dB over the frequency range of 6 MHz to 30 MHz is allowed for high-speed services having significant spectral density in this band. However, this relaxation is restricted to the common mode disturbance converted by the cable from the wanted signal.

Limits for radiated disturbance

The EUT shall meet the limits of tables 5 or 6 when measured at the measuring distance R in accordance with the methods described in clause 10 of CISPR 22. If the reading on the measuring receiver shows fluctuations close to the limit, the reading shall be recorded, with the exception of any brief isolated high reading, which shall be ignored.

Table 5 – Limits for radiated disturbance of class A ITE at a measuring distance of 10 m

Frequency range MHz	Quasi-peak limits dB(m V)
30 to 230	40
230 to 1000	47
Note 1 – The lower limit shall apply at the transition frequency. Note 2 – Additional provisions may be required for cases where interference occurs.

Table 6 – Limits for radiated disturbance of class B ITE at a measuring distance of 10 m

Frequency range MHz	Quasi-peak limits dB(m V)
30 to 230	30
230 to 1000	37
Note 1 – The lower limit shall apply at the transition frequency. Note 2 – Additional provisions may be required for cases where interference occurs.