W89C926 Datasheet, PDF (19/48 Pages) Winbond – PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER

W89C926 PENTIC+
RESET
IREQ
(Rdy/Bsy)
TR > 500 nS
CE1,2
F/EE
sampling
FCS
MSRD
MSD0-7
MSAn
TS > 150 µS
TCE > 20 mS
TAUTO < 5 mS
MSAn
FCS
MSRD
MSD0-7
TFR > 150 nS
flash address
TFOZ > 60 nS
TFR > 150 nS
flash address
TFOZ > 60 nS
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 µS.
The exact time for EEPROM loading depends on the length of CIS but must not exceed 10 mS.
- 19 -
Publication Release Date: January 1996
Revision A1