adm6995 ETC-unknow, adm6995 Datasheet - Page 50

• Manufacturer Part Number: adm6995
• Description: Port 10/100 Mb/s Single Chip Ethiernet Switch Controller
• Manufacturer: ETC-unknow

ADM6995L
ADMtek Inc.
4.7
(AT8999)
EECK
(STA)
EEDI
EEDI
Preamble
Serial Interface Timing
ADM6995L 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.
ADM6995L 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
(STA)
EEDI
EECK
1
Register +1, Register ( Register is even number).
Register, Register-1(Register is Odd number).
Example: Read Register 00h then ADM6995L will drive 0x01h & 0x00h.
Preamble
Opcode
1
(read)
0
Select
Table
1
0
Read Register 03h then ADM6995L 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
Reset
1
Type
0
z
1
Port Number or Counter Index
0
z
TA
0
0
0
0
1
0
0
0
0
Register Data [31:0]
1
0
z
Idle
0
0
0
Register Description
0
0
z
Idle
z
4-20