XR17V354IB176-F Exar Corporation, XR17V354IB176-F Datasheet - Page 9

• Manufacturer Part Number: XR17V354IB176-F
• Description: IC UART PCIE 256B DUAL 176FPBGA
• Manufacturer: Exar Corporation

Specifications of XR17V354IB176-F

• Number Of Channels: 4, QUART
• Package / Case: 176-LFBGA
• Features: *
• Fifo's: 256 Byte
• Protocol: RS485
• Voltage - Supply: 3.3V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Data Rate: 25 Mbps
• Supply Current: 120 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3.3 V
• No. Of Channels: 4
• Uart Features: Tx/Rx FIFO Counters
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: BGA
• No. Of Pins: 176
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

REV. 1.0.1
The XR17V354 UART register set is very similar to the previous generation PCI UARTs. This makes the V354
software compatible with the previous generation PCI UARTs. Minimal changes are needed to the software
driver of an existing Exar PCI UART driver so that it can be used with the V354 PCIe UART.
There are three different sets of registers as shown in
Registers is needed for plug-and-play auto-configuration. This auto-configuration feature makes installation
very easy into a PCI system and it is part of the PCI local bus specification. The second register set is the
Device Configuration Registers that are also accessible directly from the PCI bus for programming general
operating conditions of the device and monitoring the status of various functions common to all four channels.
These functions include all 4 channel UARTs’ interrupt control and status, 16-bit general purpose timer control
and status, multipurpose inputs/outputs control and status, sleep mode, soft-reset, and device identification
and revision. And lastly, each UART channel has its own set of internal UART Configuration Registers for its
own operation control and status reporting. All 4 sets of channel registers are embedded inside the device
configuration registers space, which provides faster access. The second and third set of registers are mapped
into 4K of the PCI bus memory address space. The following paragraphs describe all 3 sets of registers in
detail.
The PCI local bus configuration space registers are responsible for setting up the device’s operating
environment in the PCI local bus. The pre-defined operating parameters of the device is read by the PCI bus
plug-and-play auto-configuration manager in the operating system. After the PCI bus has collected all data
from every device/card on the bus, it defines and downloads the memory mapping information to each device/
card about their individual operation memory address location and conditions. The operating memory mapped
address location is downloaded into the Base Address Register (BAR) register, located at an address offset of
0x10 in the configuration space. Custom modification of certain registers is possible by using an external
F
1.0 XR17V354 INTERNAL REGISTERS
1.1
IGURE
D evice C onfiguration and
R egisters are m apped on
byte of m em ory address
U AR T[3:0] C onfiguration
R egister (BAR ) in a 4K-
to the Base Address
3. T
PCI LOCAL BUS CONFIGURATION SPACE REGISTERS
Interface
PC Ie
HE
space
XR17V354 R
EGISTER
S
ETS
D evice C onfiguration R egisters
D evice C onfiguration R egisters
D evice C onfiguration R egisters
registers + enhanced registers
D evice C onfiguration R egisters
registers + enhanced registers
C hannel 0 TX FIFO , R X FIFO ,
registers + enhanced registers
C hannel 1 TX FIFO , R X FIFO ,
registers + enhanced registers
C hannel 2 TX FIFO , R X FIFO ,
C hannel 3 TX FIFO , R X FIFO ,
C hannel 3 16550 com patible
C hannel 0 16550 com patible
R X FIFO + Status Burst R eg
C hannel 1 16550 com patible
R X FIFO + Status Burst R eg
C hannel 2 16550 com patible
R X FIFO + Status Burst R eg
R X FIFO + Status Burst R eg
C onfiguration Space
R egisters for Plug-
and-Play Auto
PCI Local Bus
C onfiguration
9
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
Figure
3. The PCI Local Bus Configuration Space
0x0C 00
0x0F FF
0x0000
0x0080
0x0100
0x0400
0x0800
Vendor and Sub-vendor ID
and Product M odel N um ber
in External EEPR O M
XR17V354