adm6999ux Infineon Technologies Corporation, adm6999ux Datasheet - Page 77

• Manufacturer Part Number: adm6999ux
• Description: Adm6999u 9 Port 10/100 Mb/s Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

6.2
ADM6999U/UX serial chip internal counter or EEPROM access timing.
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Figure 12
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ADM6999U/UX issue Reset internal counter command
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Data Sheet
EESK: Similar as MDC signal
EDI: Similar as MDIO
ECS: Must keep low
Preamble: At least 32 continuous "1".
Start: 01(2 bits)
Opcode: 10 (2 bits, Only supports read command)
Table select: 1/Counter, 0/ EEPROM (1 bit)
Register Address: Read Target register address. ( 7 bits)
TA: Turn Around.
Register Data: 32 bit data.
Counter output bit sequence is bit 31 to bit 0.
If users read EEPROM then 32 bits data will separate as two EEPROM registers. The sequence is:
– Register +1, Register ( Register is even number).
– Register, Register-1(Register is Odd number).
– Example: Read Register 00
Idle: EESK must send at least one clock at idle time.
EESK: Similar as MDC signal
EDI: Similar as MDIO
ECS: Must keep low
Preamble
ADM6999U/UX will drive 03
1
Serial Interface Timing
0
Serial Interface Timing X
Start
1
Opcode
1
(read)
0
1
Address
Device
0
0
H
H
then ADM6999U/UX will drive 01
& 02
0
H
0
Register Address
1
1
1
1
77
1
z
TA
0
H
& 00
H
.Read Register 03
Register Data [31:0]
Rev. 1.42, 2005-11-25
Serial Management
ADM6999U/UX
H
then
Data Sheet
Idle