w89c926 Winbond Electronics Corp America, w89c926 Datasheet - Page 20

• Manufacturer Part Number: w89c926
• Description: Pcmcia Ethernet Network Twisted Pair Interface Controller
• Manufacturer: Winbond Electronics Corp America

EEPROM Contents Load Back
When an EEPROM is used to store CIS, the PENTIC+ allows the contents of the EEPROM to be
modified by means of the following sequence:
write (EEAR, EOS = 1 EW/ER = 1)
write (ADR, address);
write (ADR, word_data);
wait ( );
repeat (
/* The entire sequence should be consecutive or the process will be aborted. */
EECS, RCS
(Rdy/Bsy)
sampling
MSD0-7
MSD0-7
RESET
MSWR
MSWR
CE1,2
EECS
MSAn
MSAn
IREQ
F/EE
RCS
read(EEAR, EOS);
) until (EOS = 0);
T > 500 nS
R
MSD0-2
T
T > 150 S
EER
S
> 32 S
16 bit EEload
T
EEOZ
> 0.5 S
- 20 -
even address
T
SW
T
T
CE
AUTO
low byte
> 100 nS
> 20 mS
< 10 mS
T
SOZ
W89C926 PENTIC+
> 20 nS
T
odd address
SW
high byte
> 100 nS
T
SOZ
> 20 nS