SMC Networks SMC91C95 Product Manual page 12

PIN NO. NAME
88 nI/O Read
87 nI/O Write
86 nMemory
Read
nOutput
Enable
24 nModem
Reset
18 Modem
Interrupt
23 nModem
Chip Select
17 Modem
Ready
27 nModem
Powerdown
DESCRIPTION OF PIN FUNCTIONS
SYMBOL TYPE
nIOIS16
nIORD IS with
pullup
nIOWR IS with
pullup
nMEMR IS with
pullup
nOE
nMRESET O4
MINT I with pull
down
nMCS O4
MRDY I with pullup
nMPWDN O4
12
DESCRIPTION
PCMCIA - Active low output asserted
whenever the SMC91C95 is in 16 bit mode,
and "Enable Function" bit in the ECOR
register is high, nREG is low and A4-A15
decode to the LAN address specified in I/O
Base Registers 0 and 1 in PCMCIA attribute
space.
Input. Active low read strobe used to access
the SMC91C95 IO space.
Input. Active low write strobe used to access
the SMC91C95 IO space.
ISA - Active low signal used by the host
processor to read from the external ROM.
PCMCIA - Output Enable input used to read
from the COR, CSR and attribute memory.
Reset output to Modem. Asserted whenever
RESET pin is high, internal POR is active, or
SRESET bit is high (MCOR bit 7).
Interrupt input from Modem. Reflected in
INTR (CSR bit 1) and asserts the appropriate
interrupt pin if enabled.
Chip select output to modem.
Modem ready input. Low indicates the modem
is not ready, either after reset or exiting from
stop or sleep modes.
Powerdown output to modem controller. This
pin is active (low) when either the PWRDWN
bit (CSR bit 2) is set or the modem is disabled
(not configured).