adm6996f Infineon Technologies Corporation, adm6996f Datasheet - Page 53

• Manufacturer Part Number: adm6996f
• Description: 6 Port 10/100 Mb/s Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

ADM6996F
Infineon-ADMtek Co Ltd
4.7
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Preamble
Serial Interface Timing
ADM6996F serial chip internal counter or EEPROM access timing.
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.
sequence is:
Idle: EESK must send at least one clock at idle time.
ADM6996F issue Reset internal counter command
EESK: Similar as MDC signal.
EDI: Similar as MDIO.
ECS: Must keep low.
1
0
Start
Counter output bit sequence is bit 31 to bit 0.
If user read EEPROM then 32 bits data will separate as two EEPROM registers. The
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Register +1, Register ( Register is even number).
Register, Register-1(Register is Odd number).
Example: Read Register 00h then ADM6996F will drive 0x01h & 0x00h.
Preamble
Opcode
1
(read)
0
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1
0
Read Register 03h then ADM6996F will drive 0x03h & 0x02h.
Start
Address
0
Device
1
0
Opcode
0
(reset)
0
1
0
Register Address
1
1
Address
Device
1
0
1
0
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1
ç ø
0
1
Port Number or Counter Index
0
z
TA
0
0
Ã
0
Ä
0
Ã
0
Ã
Register Data [31:0]
1
Ã
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Ã
Ã
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Register Description
Ã
Ã
Idle
4-1