REV. 1.0.3 HIGH PERFORMANCE DUAL PCI EXPRESS UART 3.0 UART There are 2 UARTs channel [1:0] in the V352. Each has its own 256-byte o" />
參數(shù)資料
型號： XR17V352IB-0A-EVB
廠商： Exar Corporation
文件頁數(shù)： 25/64頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR17V352 113BGA
產(chǎn)品培訓模塊： PCIe UARTs
標準包裝： 1
主要目的： 接口，UART
已用 IC / 零件： XR17V352
已供物品： 板
其它名稱： 1016-1610
1016-1610-ND
1016-1645
XR17V352IB-0A-EVB-ND
XR17V352
31
REV. 1.0.3
HIGH PERFORMANCE DUAL PCI EXPRESS UART
3.0 UART
There are 2 UARTs channel [1:0] in the V352. Each has its own 256-byte of transmit and receive FIFO, a set of
16550 compatible control and status registers, and a baud rate generator for individual channel data rate
setting. Eight additional registers per UART were added for the EXAR enhanced features.
3.1
Programmable Baud Rate Generator with Fractional Divisor
Each UART has its own Baud Rate Generator (BRG) with a prescaler for the transmitter and receiver. The
prescaler is controlled by a software bit in the MCR register. The MCR register bit [7] sets the prescaler to
divide the internal 125MHz clock by 1 or 4. The output of the prescaler clocks to the BRG. The BRG further
divides this clock by a programmable divisor between 1 and (216 - 0.0625) in increments of 0.0625 (1/16) to
obtain a 16X, 8X or 4X 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, DLM and DLD registers) defaults to 1 (DLL = 0x01, DLM = 0x00, DLD = 0x00). The
DLL and DLM registers provide the integer part of the divisor and the DLD register provides the fractional part
of the divisor. Only the four lower bits of the DLD are implemented and they are used to select a value from 0
(for setting 0000) to 0.9375 or 15/16 (for setting 1111). Programming the Baud Rate Generator Registers DLL,
DLM and DLD provides the capability for selecting the operating data rate. Table 11 shows the divisor for some
standard and non-standard data rates when using the internal 125MHz clock at 16X clock rate. If the pre-scaler
is used (MCR bit [7] = 1), the output data rate will be 4 times less than that shown in Table 11. At 8X sampling
rate, these data rates would double. At 4X sampling rate, these data rates would quadruple. Also, when using
8X or 4X sampling mode, note that the bit-time will have a jitter (+/- 1/16) whenever the DLD is an odd number.
For data rates not listed in Table 11, the divisor value can be calculated with the following equation(s):
Required Divisor (decimal) = (125MHz clock frequency / prescaler) / (serial data rate x 16),
WITH
8XMODE =0 AND 4XMODE = 0
Required Divisor (decimal) = (125MHz clock frequency / prescaler / (serial data rate x 8),
WITH
8XMODE = 1 AND 4XMODE = 0
Required Divisor (decimal) = (125MHz clock frequency / prescaler / (serial data rate x 4),
WITH
8XMODE = 0 AND 4XMODE = 1
ROUND( (Required Divisor - TRUNC (Required Divisor) )*16)/16 + TRUNC (Required Divisor), where
DLM = TRUNC( Required Divisor) >> 8
DLL = TRUNC (Required Divisor) & 0xFF
DLD = ROUND ( (Required Divisor-TRUNC(Required Divisor) )*16)
The closest divisor that is obtainable in the V352 can be calculated using the following formula:
In the formulas above, please note that:
TRUNC (N) = Integer Part of N. For example, TRUNC (5.6) = 5.
ROUND (N) = N rounded towards the closest integer. For example, ROUND (7.3) = 7 and ROUND (9.9) = 10.
相關PDF資料
PDF描述
222A185-3-0 BOOT MOLDED
Q2-F-1/8-01-MS100FT HEATSHRNK POLY Q2F 1/8" BLK 100'
H0PPH-1018M DIP CABLE - HDP10H/AE10M/HDP10H
MLF2012K560K INDUCTOR MULTILAYER 56UH 0805
RPP30-4812S CONV DC/DC 30W 36-75VIN 12VOUT
相關代理商/技術參數(shù)
參數(shù)描述
XR17V352IB113-F 功能描述:UART 接口集成電路 2 Channel PCIe UART w/256 Byte FIFO 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
XR17V354 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE QUAD PCI-EXPRESS UART
XR17V354IB-0A-EVB 功能描述:界面開發(fā)工具 Eval Board for XR17V354IB-0A RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
XR17V354IB176-F 功能描述:UART 接口集成電路 4 Channel PCIe UART w/256 Byte FIFO 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
XR17V354IB-E4-EVB 功能描述:界面開發(fā)工具 Eval Board for XR17V354IB-E4 RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*