xr16v2651im Exar Corporation, xr16v2651im Datasheet - Page 13

• Manufacturer Part Number: xr16v2651im
• Description: High Performance Duart With 32-byte Fifo And Powersave
• Manufacturer: Exar Corporation

REV. 1.0.2
The transmitter section comprises of an 8-bit Transmit Shift Register (TSR) and 32 bytes of FIFO which
includes a byte-wide Transmit Holding Register (THR). TSR shifts out every data bit with the 16X/8X/4X
internal clock. A bit time is 16/8/4 clock periods (see DLD[5:4]). The transmitter sends the start-bit followed by
the number of data bits, inserts the proper parity-bit if enabled, and adds the stop-bit(s). The status of the FIFO
and TSR are reported in the Line Status Register (LSR bit-5 and bit-6).
2.10
Output Data
Required
1000000
100000
115200
153600
200000
225000
230400
250000
300000
400000
460800
500000
750000
921600
10000
19200
25000
28800
38400
50000
57600
75000
Rate
2400
4800
9600
400
Transmitter
T
ABLE
6: T
YPICAL DATA RATES WITH A
D
16x Clock
(Decimal)
IVISOR FOR
52.0833
39.0625
26.0417
13.0208
156.25
78.125
9.7656
6.6667
6.5104
3.2552
1.6276
HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE FEATURE
312.5
3750
3.75
625
150
7.5
1.5
60
30
20
15
6
5
3
2
O
BTAINABLE IN
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
3 12/16
1 10/16
7 8/16
6 8/16
3 4/16
1 8/16
V2651
3750
IVISOR
625
150
60
30
20
15
13
6
5
3
2
24 MH
DLM P
V
ALUE
Z CRYSTAL OR EXTERNAL CLOCK AT
13
ROGRAM
E
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(HEX)
DLL P
V
ALUE
A6
9C
4E
3C
1E
1A
71
38
96
34
27
14
D
ROGRAM
F
9
7
6
6
6
5
3
3
3
2
1
1
(HEX)
DLD P
V
ALUE
ROGRAM
C
B
C
A
16X S
0
0
8
4
0
2
0
1
1
0
1
0
0
0
8
8
0
0
4
0
0
8
(HEX)
AMPLING
XR16V2651
D
ATA
R
ATE
0.04
0.08
0.16
0.16
0.31
0.16
0.16
0.16
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
E
RROR
(%)