DESCRIPTION OF PIN FUNCTIONS
BUFFER
PIN NO.
NAME
SYMBOL
TYPE
DESCRIPTION
81
nRequest to
Send
nRTS1
O4
Active low Request to Send output for
Primary Serial Port.
Handshake output
signal notifies modem that the UART is
ready to transmit data. This signal can be
programmed by writing to bit 1 of Modem
Control Register (MCR).
The hardware
reset will reset the nRTS signal to inactive
mode (high). Forced inactive during loop
mode operation.
Parallel Port
Configuration
Control
PCF1
I
FDC37C666GT (Adapter Mode): Parallel
Port Configuration Control 1. During reset
active this input is read and latched to
define the address of the Parallel Port.
91
nRequest to
Send
nRTS2
O4
Active low Request to Send output for
Secondary Serial Port. Handshake output
signal notifies modem that the UART is
ready to transmit data. This signal can be
programmed by writing to bit 1 of Modem
Control Register (MCR).
The hardware
reset will reset the nRTS signal to inactive
mode (high). Forced inactive during loop
mode operation.
Secondary Serial S2CF0
Port
Configuration
Control
I
FDC37C666GT (Adapter Mode): Secondary
Serial Port Configuration Control 0. During
Reset active this input is read and latched to
define the address of the Secondary Serial
Port.
10
SMSC [ SMSC CORPORATION ]
