xr
XR17D154
REV. 1.2.0
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
TABLE 20: UART RESET CONDITIONS
RESET STATE
REGISTERS
DLL
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x01
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x60
Bits 3-0 = logic 0
DLM
RHR
THR
IER
FCR
ISR
LCR
MCR
LSR
MSR
Bits 7-4 = logic levels of the inputs
Bits 7-0 = 0xFF
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
RESET STATE
SPR
FCTR
EFR
TXCNT
TXTRG
RXCNT
RXTRG
XCHAR
XON1
XON2
XOFF1
XOFF2
I/O SIGNALS
TX[ch-3:0]
HIGH (if ENIR pin = LOW)
LOW (if ENIR pin = HIGH)
RTS#[ch-3:0]
DTR#[ch-3:0]
EECK
HIGH
HIGH
LOW
LOW
LOW
EECS
EEDI
51
EXAR [ EXAR CORPORATION ]
