XR16M598 Datasheet, PDF (7/58 Pages) Exar Corporation – 1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO

XR16M598
REV. 1.0.0
1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO
1.0 DESCRIPTION
The XR16M598 (598) integrates the functions of 8 enhanced 16550 UARTs, a general purpose 16-bit timer/
counter and an on-chip oscillator. The device configuration registers include a set of four consecutive interrupt
source registers that provides interrupt-status for all 8 UARTs, timer/counter and a sleep wake up indicator.
Each UART channel has its own 16550 UART compatible configuration register set for individual channel
control, status, and data transfer. Additionally, each UART channel has 16-byte of transmit and receive FIFOs,
automatic RTS/CTS or DTR/DSR hardware flow control with hysteresis control, automatic Xon/Xoff and special
character software flow control, programmable transmit and receive FIFO trigger levels, infrared encoder and
decoder (IrDA ver. 1.0), programmable baud rate generator with a prescaler of divide by 1 or 4, and data rate
up to 15Mbps. The XR16M598 is a 1.62V-3.63V device.
TABLE 1: MAX DATA RATES
VOLTAGE
3.3V
2.5V
1.8V
16X SAMPLING
RATE
3.75 Mbps
2.5 Mbps
0.9375 Mbps
8X SAMPLING
RATE
7.5 Mbps
5 Mbps
1.875 Mbps
4X SAMPLING
RATE
15 Mbps
10 Mbps
3.75 Mbps
2.0 FUNCTIONAL DESCRIPTIONS
2.1 Device Reset
2.1.1 Hardware Reset
The RST# input resets the internal registers and the serial interface outputs in all 8 channels to their default
state (see Table 19). A LOW pulse of longer than 40 ns duration will be required to activate the reset function
in the device.
2.1.2 Software Reset
The internal registers of each UART can be reset by writing to the RESET register in the Device Configuration
Registers. For more details, see the RESET register description on page 30.
2.2 UART Channel Selection
A LOW on the chip select pin, CS#, allows the user to select one of the UART channels to configure, send
transmit data and/or unload receive data to/from the UART. When address line A7 = 0, address lines A6:A4
are used to select one of the eight channels. See Table 2 below for UART channel selection.
TABLE 2: UART CHANNEL SELECTION
A7
A6
A5
A4
FUNCTION
0
0
0
0
Channel 0 Selected
0
0
0
1
Channel 1 Selected
0
0
1
0
Channel 2 Selected
0
0
1
1
Channel 3 Selected
0
1
0
0
Channel 4 Selected
0
1
0
1
Channel 5 Selected
0
1
1
0
Channel 6 Selected
0
1
1
1
Channel 7 Selected
7