lan83c175 Standard Microsystems Corp., lan83c175 Datasheet - Page 63

• Manufacturer Part Number: lan83c175
• Description: Ethernet Cardbus Integrated Controller With Modem Support Corporation
• Manufacturer: Standard Microsystems Corp.

15 through 1: Return zeroes to indicate that
64 Kbytes of address space are required.
1 - ADDRESS DECODE ENABLE: Controls
whether or not the LAN83C175 accepts
accesses to its expansion ROM.
3C - BUS REQUIREMENTS / INTERRUPT
MAP
Reset Value:
000000000000000000000001xxxxxxxx
31 through 24 - MAXIMUM LATENCY: This
read only field specifies how often the
LAN83C175 needs to gain access to the
CardBus
tuning, the value is recalled from EEPROM
after reset.
23 through 16 - MINIMUM GRANT: This read
only field specifies how long a burst period the
LAN83C175
CardBus clock rate.* To enable performance
tuning, the value
EEPROM after reset.
bus.*
needs
To enable performance
is
assuming
recalled
a
33MHz
from
63
15 through 8 - INTERRUPT PIN: This read only
field
LAN83C175's interrupt output is connected to the
nINTA pin on the CardBus connector.
7 through 0 - INTERRUPT LINE:
programmed with interrupt routing information.
The value indicates which input of the systems
interrupt controller(s) the LAN83C175's interrupt
pin is connected to. Values in this register are
system architecture specific.
* The maximum latency and minimum grant
registers are used to indicate the LAN83C175's
desired settings for Latency Timer values. Both
registers specify a period of time in units of 1/4
microsecond.
needs to perform a burst 2 microseconds in length
every 11 microseconds (on the average), then the
maximum latency register would read 44 (1Ch)
and the minimum grant register would read 8
(08h).
returns
For example, if the LAN83C175
01h
to
indicate
This byte is
that the