XR28V384IM48-0A-EB Datasheet, PDF (3/42 Pages) Exar Corporation – XR28V384 3.3V QUAD LPC UART WITH 128-BYTE FIFO

XR28V384
REV. 1.0.0
PIN DESCRIPTIONS
3.3V QUAD LPC UART WITH 128-BYTE FIFO
Pin Description
NAME
48-TQFP
PIN#
TYPE
DESCRIPTION
LPC BUS INTERFACE
PCIRST#
LAD3
LAD2
LAD1
LAD0
LCLK
1
I Active low Reset signal.
4
Multiplexed address / data bus [3:0]. See ’Section 1.2, LPC Bus Interface’.
5
I/O
6
7
8
I LPC clock input up to 33.3MHz.
LFRAME#
9
I
Active low LPC Frame signal indicates start of a new cycle or termination of a
broken cycle.
SERIRQ
Bi-directional pin for sending interrupts. By default this pin is tri-stated when idle.
10
I/O
Interrupts can be active high or low. See ’Section 1.2.1, Serial IRQ’ and See
’Section 2.2.1.3, Interrupt Enable Register (IER) - Read/Write’ for more infor-
mation regarding interrupts.
UART I/O INTERFACE
CTSD#
13
I
UART Channel D Clear-to-Send (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
DSRD#
14
I
UART Channel D Data-Set-Ready (active low) or general purpose input. This
input should be connected to VCC or GND when not used.
RTSD#/RS485
15
UART Channel D Request-to-Send (active low) or general purpose output or
O Automatic RS485 Half Duplex control pin. See ’Section 1.4.4, Auto RS-485
Half-Duplex Control’.
DTRD#
16
O UART Channel D Data-Terminal-Ready (active low) or general purpose output.
RXD
17
I
UART Channel D Receive Data. Normal receive data input must idle at logic 1
condition. This input should be connected to VCC or GND when not used.
TXD /
18
PS_2E8_IRQD
UART Channel D Transmit Data. The TXD signal will be a logic 1 during reset or
idle (no data). If it is not used, leave it unconnected.
O ^{This pin has an internal pull-up resistor and is sampled upon power-up or reset.}
This will determine the default register settings for UART channel D. The regis-
ters can later be modified by the software. See Table 1 ’UART Power On Con-
figuration’.
CDD#
19
I
UART Channel D Carrier-Detect (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
RID#
20
I
UART Channel D Ring-Indicator (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
CTSC#
21
I
UART Channel C Clear-to-Send (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
DSRC#
22
I
UART Channel C Data-Set-Ready (active low) or general purpose input. This
input should be connected to VCC or GND when not used.
3