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XR17L154 Datasheet(Hoja de datos) 6 Page - Exar Corporation

No. de Pieza. XR17L154
Descripción  3.3V PCI BUS QUAD UART
Descarga  56 Pages
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Fabricante  EXAR [Exar Corporation]
Página de inicio  http://www.exar.com
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XR17L154
3.3V PCI BUS QUAD UART
DISCONTINUED
REV. 1.1.0
6
FUNCTIONAL DESCRIPTION
The XR17L154 (L154) integrates the functions of 4 enhanced 16550 UARTs with the PCI Local Bus interface
and a non-volatile memory interface for PCI bus’s plug-and-play auto-configuration, a 16-bit timer/counter, 8
multi-purpose inputs/outputs, and an on-chip oscillator. The PCI local bus is a synchronous timing bus where
all bus transactions are associated to the bus clock of up to 33 MHz. The L154 supports 32-bit wide read and
write data transfer operations including data burst mode through the PCI Local Bus interface. Read and write
data operations maybe in byte, word or double-word (DWORD) format. The data transfer rate in a DWORD
operation is 4 times faster than the single byte operation with 8-bit ISA bus. A single 32-bit interrupt status
register provides interrupts status for all 4 UARTs, timer/counter, multipurpose inputs/outputs, and a special
sleep wake up indicator. There are three sets of register in the device. First, the PCI local bus configuration
registers for PCI auto configuration. A set of device configuration registers for overall control, 32-bit wide
transmit and receive data transfer, and monitoring of the 4 UART channels. Lastly, each UART channel has its
own 16550 UART compatible configuration register set for individual channel control, status, and byte wide
data transfer.
Each UART has the improved fifth generation (5G) register set, 64-byte 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 level, FIFO level counters, infrared encoder and
decoder (IrDA ver 1.0), programmable baud rate generator with a prescaler of 1X or 4X, and data rate up to 2
Mbps. The XR17L154 bus timing and drive capability meets the PCI local bus specification revision 2.2 for 3.3V
33 MHz operation over the temperature range. The XR17L154 is available in the same thin 144-pin TQFP
(20x20x1.4mm) package and pin-out as the XR17C154 and XR17C158 in commercial and industrial
temperature ranges.
PCI LOCAL BUS INTERFACE
This is the host interface and it meets the PCI Local Bus Specification revision 2.2. The PCI local bus
operations are synchronous meaning each transaction is associated to the bus clock. The XR17L154 can
operate with the bus clock of up to a 33 MHz. Data transfers operation can be formatted in 8-bit, 16-bit, 24-bit
or 32-bit wide. With 32-bit data operations, it pushes the data transfer rate on the bus up to 132 MByte/sec.
This increases the overall system’s communication performance up to 16 times better than the 8-bit ISA bus.
See PCI local bus specification revision 2.2 for bus operation details.
PCI LOCAL BUS CONFIGURATION SPACE REGISTERS
A set of PCI local bus configuration space register is provided. These registers provide the PCI local bus
operating system with the card’s vendor ID, device ID, sub-vendor ID, product model number, and resources
and capabilities. The PCI local bus operating system collects this data from all the cards on the bus during the
auto configuration phase that follows immediately after a power up or system reset/reboot. After it has sorted
out all devices on the bus, it defines and download the operating conditions to the cards. One of the definitions
is the base address loaded into the Base Address Register (BAR) where the card will be operating in the PCI
local bus memory space.
EEPROM INTERFACE
An external 93C46 EEPROM is only used to store the vendor’s ID and model number, and the sub-vendor’s ID
and product model number. This information is only used with the plug-and-play auto configuration of the PCI
local bus. These data provide automatic hardware installation onto the PCI bus. The EEPROM interface
consists of 4 signals, EEDI, EEDO, EECS, and EECK. The EEPROM is not needed when auto configuration is
not required in the application. However, If your design requires non-volatile memory for other purpose. It is
possible to store and retrieve data on the EEPROM through a special PCI device configuration register. See
application note DAN112 for its programming details.




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