w89c926 Winbond Electronics Corp America, w89c926 Datasheet - Page 19

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

EECS/FCS Pulled Low
If EECS/ FCS is pulled low, this indicates that the configurations, Ethernet ID, and CIS are stored in
an EEPROM. In this case, after a power-on reset the PENTIC+ will load the configurations into the
LAN configuration registers and the Ethernet IDs and CIS into the higher half of SRAM memory (with
auto-mapping to ID registers and attribute memory space, respectively). Since the EEPROM used is
a 93C66, a serial EEPROM storage device, the access time is quite long and the system has to wait
for the loading sequence (refer to PCMCIA R2.1). Loading a word of EEPROM typically takes 34 S.
The exact time for EEPROM loading depends on the length of CIS but must not exceed 10 mS.
(Rdy/Bsy)
sampling
MSD0-7
MSD0-7
RESET
CE1,2
MSRD
MSRD
IREQ
MSAn
MSAn
F/EE
FCS
FCS
T > 500 nS
R
T > 150 S
S
flash address
T
FR
> 150 nS
T
FOZ
- 19 -
> 60 nS
T
T
CE
AUTO
> 20 mS
< 5 mS
Publication Release Date: January 1996
flash address
W89C926 PENTIC+
T
FR
> 150 nS
T
FOZ
> 60 nS
Revision A1