xr17v254 Exar Corporation, xr17v254 Datasheet - Page 30

• Manufacturer Part Number: xr17v254
• Description: 66mhz Pci Bus Quad Uart With Power Management Support
• Manufacturer: Exar Corporation

XR17V254
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
F
IGURE
O
UTPUT
R
100000
115200
153600
200000
225000
230400
250000
300000
EQUIRED
10000
19200
25000
28800
38400
50000
57600
75000
R
2400
4800
9600
400
T
11. B
ATE
ABLE
D
ATA
AUD
12: T
XTAL1
XTAL2
R
YPICAL DATA RATES WITH A
D
ATE
16x Clock
(Decimal)
IVISOR FOR
52.0833
39.0625
26.0417
13.0208
156.25
78.125
9.7656
6.6667
6.5104
312.5
3750
625
150
7.5
60
30
20
15
G
6
5
ENERATOR
Crystal
Buffer
Osc/
O
BTAINABLE IN
Channels
To Other
312 8/16
156 4/16
78 2/16
52 1/16
39 1/16
26 1/16
D
9 12/16
6 11/16
7 8/16
6 8/16
V254
3750
IVISOR
625
150
60
30
20
15
13
6
5
Divide by 4
Divide by 1
Prescaler
Prescaler
24 MH
DLM P
V
ALUE
Z CRYSTAL OR EXTERNAL CLOCK AT
30
ROGRAM
E
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(HEX)
MCR Bit-7=0
MCR Bit-7=1
(default)
DLL, DLM and DLD
Fractional Baud
Rate Generator
DLL P
V
ALUE
Registers
Logic
A6
9C
4E
3C
1E
1A
71
38
96
34
27
14
D
ROGRAM
F
9
7
6
6
6
5
(HEX)
DLD P
V
to Transmitter
and Receiver
ALUE
Rate Clock
16X or 8X
Sampling
ROGRAM
C
B
0
0
8
4
0
2
0
1
1
0
1
0
0
0
8
8
0
0
(HEX))
16X S
AMPLING
D
ATA
R
ATE
0.04
0.08
0.16
0.16
0.31
0.16
REV. 1.0.0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
E
RROR
(%)