XR17D154IV Exar Corporation, XR17D154IV Datasheet - Page 35

• Manufacturer Part Number: XR17D154IV
• Description: Universal QUART W/ PCI Bus Interface.
• Manufacturer: Exar Corporation

Specifications of XR17D154IV

• Features: *
• Number Of Channels: 4, QUART
• Fifo's: 64 Byte
• Protocol: RS485
• Voltage - Supply: 3.3V, 5V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

xr
REV. 1.2.2
Address lines A0 to A3 select the 16 registers in each channel. The first 8 registers are 16550 compatible with
the EXAR enhanced feature registers located on next 8 addresses locations. Addresses 0x080 to 0x093
comprise the Device Configuration Registers and they reside in Channel 0’s space.
.
A3
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
A
A2
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
DDRESS
A1
0
0
0
0
0
1
1
1
0
0
1
1
1
0
0
1
1
1
1
0
0
0
1
1
A0
0
0
0
1
1
0
0
1
0
1
0
0
1
0
1
0
0
1
1
0
0
1
0
1
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Div Latch Low
DLM - Div Latch High
IER - Interrupt Enable Register
ISR - Interrupt Status Register
FCR - FIFO Control Register
LCR - Line Control Register
MCR - Modem Control Register
LSR - Line Status Register
MSR - Modem Status Register
RS485 Turn-Around Delay Register
SPR - Scratch Pad Register
FCTR - Feature Control Register
EFR - Enhanced Function Register
TXCNT - Transmit FIFO Level Counter
TXTRG - Transmit FIFO Trigger Level
RXCNT - Receive FIFO Level Counter
RXTRG - Receive FIFO Trigger Level
Xoff-1 - Xoff Character 1
Xchar
Xoff-2 - Xoff Character 2
Xon-1 - Xon Character 1
Xon-2 - Xon Character 2
T
ABLE
12: UART CHANNEL CONFIGURATION REGISTERS
R
EGISTER
16550 C
E
NHANCED
OMPATIBLE
35
R
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
EGISTERS
R
EGISTERS
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Write-only
Read-only
Write-only
Read-only
Read-only
Write-only
Read-only
Write-only
Read-only
Write-only
Write-only
Read-only
Write-only
Write-only
Write-only
EAD
/W
RITE
Xon,Xoff Rcvd. Flags
LCR[7] = 0
LCR[7] = 0
LCR[7] = 1
LCR[7] = 1
LCR[7] = 0
C
OMMENTS
XR17D154