參數(shù)資料
型號(hào)： XR17C158
廠商： Exar Corporation
英文描述： PCI Bus Octal UART(八通用異步接收器/發(fā)送器（滿足通訊系統(tǒng)中PCI總線和高帶寬要求）)
中文描述： PCI總線八路的UART（八通用異步接收器/發(fā)送器（滿足通訊系統(tǒng)中的PCI總線和高帶寬要求））
文件頁(yè)數(shù)： 22/51頁(yè)
文件大?。?/td> 685K
代理商： XR17C158
PCI BUS OCTAL UART
XR17C158
PRELIMINARY
REV. 1.0.0
22
register. The MCR register bit-7 sets the prescaler to
divide the input crystal or external clock by 1 or 4.
The output of the prescaler clocks to the BRG. The
BRG further divides this clock by a programmable di-
visor between 1 and (2
16
-1) to obtain a 16X or 8X
sampling clock of the serial data rate. The sampling
clock is used by the transmitter for data bit shifting
and
receiver for data sampling. The BRG divisor (DLL
and DLM registers) defaults to a random value upon
power up. Therefore, the BRG must be programmed
during initialization to the operating data rate.
Programming the Baud Rate Generator Registers
DLM and DLL provides the capability for selecting the
operating data rate.
Table 9
shows the standard data
rates available with a 14.7456 MHz crystal or external
clock at 16X clock rate. At 8X sampling rate, these
data rates would double. When using a non-standard
data rate crystal or external clock, the divisor value
can be calculated with the following equation(s).
F
IGURE
8. B
AUD
R
ATE
G
ENERATOR
XTAL1
XTAL2
Crystal
Osc/
Buffer
MCR Bit-7=0
(default)
MCR Bit-7=1
DLL and DLM
Registers
Prescaler
Divide by 1
Prescaler
Divide by 4
16X or 8X
Sampling
Rate Clock to
Transmitter
and Receiver
To Other
Channels
Baud Rate
Generator
Logic
divisor (decimal) = (XTAL1 clock frequency / prescaler) / ( serial data rate x 16 ),
WITH
8XMODE [7:0]
IS
0
divisor (decimal) = (XTAL1 clock frequency / prescaler / (serial data rate x 8),
WITH
8XMODE [7:0]
IS
1
T
ABLE
9: T
YPICAL
DATA
RATES
WITH
A
14.7456 MH
Z
CRYSTAL
OR
EXTERNAL
CLOCK
AT
16X S
AMPLING
O
UTPUT
Data Rate
MCR Bit-7=1
O
UTPUT
Data Rate
MCR Bit-7=0
D
IVISOR
FOR
16x
Clock (Decimal)
D
IVISOR
FOR
16x
Clock (HEX)
DLM P
ROGRAM
V
ALUE
(HEX)
DLL P
ROGRAM
V
ALUE
(HEX)
D
ATA
R
ATE
E
RROR
(%)
100
600
1200
2400
4800
9600
19.2k
38.4k
57.6k
115.2k
230.4k
400
2400
4800
9600
19.2k
38.4k
76.8k
153.6k
230.4k
460.8k
921.6k
2304
384
192
96
48
24
12
6
4
2
1
900
180
C0
60
30
18
0C
06
04
02
01
09
01
00
00
00
00
00
00
00
00
00
00
80
C0
60
30
18
0C
06
04
02
01
0
0
0
0
0
0
0
0
0
0
0
相關(guān)PDF資料
PDF描述
XR17D152 UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
XR17D152CM UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
XR17D152IM UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
XR17D158IV UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
XR17D158 UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17C158CV 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17C158CV-0A-EVB 功能描述:UART 接口集成電路 Supports C158 144 ld TQFP, PCI Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17C158CV-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17C158CVTR-F 制造商:Exar Corporation 功能描述:UART 8-CH 64Byte FIFO 5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17C158CVTR-F
XR17C158IV 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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