83C795 Datasheet, PDF (28/136 Pages) List of Unclassifed Manufacturers – Ethernet System Controller

ETHERNET SYSTEM CONTROLLER REGISTERS
83C795
BIT
EER READ
7 STO
6 RC
5 EA4
4 UNLOCK
3 JMP3
2 JMP2
1 JMP1
0 JMP0
RESET
0
0
0
0
PIN
PIN
PIN
PIN
BIT
EER WRITE
7 STO
6 RC
5 EA4
4 UNLOCK
3 EA3
2 EA2
1 EA1
0 EA0
RESET
0
0
0
0
0
1
1
0
Bit 7: STO, Store Into Non-Volatile EEROM
S et this bit to1 to s tore the 8 LAN address regis ters
into the E E R OM. T he bit automatically res ets when
the s tore is complete. T his function will not be
performed unles s the s torage circuit has been
armedby as eries of acces s es totheE E R R egister.
(S ee S ection 6.5.2.3 for details .)
Bit 6: RC, Recall EEROM
S et this bit to1 torecall the8 LAN addres s regis ters
from E E R OM. T he bit will be automatically res et
when the recall is complete.
Bit 4: UNLOCK, Unlock Store
T his bit is used to unlock the E E PR OM for storage
operations. (S ee S ection 6.5.2.3 for details.)
Bits 3-0: JMP3-JMP0, Initialization Jumpers
T hes e bits are wired to the JMP input pins of the
chip. T he JMP fieldvalue is used by the recall logic
todeterminewhich bank of E E R OMtoloadthehos t
interface configuration regis ters from.
Bits 5, 3-0: EA4-EA0, EEROM Address Field
T his field determines which bank of E E R OM the
LAN addres s regis ters are s tored into or recalled
from. T his field does not change when a recall
operation takes place. E A4 = 1 indicates an access
to the Plug and Play res ource string.
5.1.3 IOPL - I/O Pipe Data Location Low
R ead/Write Port = 02
T his regis ter and IOPH determine the locations
data is read from or written to.
BIT
7 IOP7
6 IOP6
5 IOP5
4 IOP4
3 IOP3
2 IOP2
1 IOP1
0 IOP0
IOPL
RESET
0
0
0
0
0
0
0
0
Bits 7-0: IOP7-0, I/O Pipe Data Location Low
When IOPE N (ICR .4) is s et, thes e arethe locations
that data is read from or written to in the I/O pipe
operation. All 8-bit operations mus t take place
through IOPL only.
5.1.4 IOPH - I/O Pipe Data Location High
R ead/Write Port = 03
T his regis ter andIOPL determinethelocations data
is read from or written to.
BIT
7 IOP15
6 IOP14
5 IOP13
4 IOP12
3 IOP11
2 IOP10
1 IOP9
0 IOP8
IOPH
RESET
0
0
0
0
0
0
0
0
Bits 15-8: IOP15-8, I/O Pipe Data Location High
When IOPE N (ICR .4) is s et, thes e arethe locations
that data is read from or written to in the I/O pipe
operation. All 8-bit operations mus t take place
through the IOPL regis ter.
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