REV. 1.0.2 registers, but do not attempt to read from both uarts simultaneously. Individua" />
參數(shù)資料
型號： XR16V2650IM-0B-EB
廠商： Exar Corporation
文件頁數(shù)： 46/47頁
文件大小： 0K
描述： EVAL BOARD FOR V2650 48TQFP
標(biāo)準(zhǔn)包裝： 1
系列： *
XR16V2650
8
HIGH PERFORMANCE DUART WITH 32-BYTE FIFO
REV. 1.0.2
registers, but do not attempt to read from both uarts simultaneously. Individual channel select functions are
shown in Table 1.
2.6
Channel A and B Internal Registers
Each UART channel in the V2650 has a set of enhanced registers for controlling, monitoring and data loading
and unloading. The configuration register set is compatible to those already available in the standard single
16C550 and dual ST16C2550. These registers function as data holding registers (THR/RHR), interrupt status
and control registers (ISR/IER), a FIFO control register (FCR), receive line status and control registers (LSR/
LCR), modem status and control registers (MSR/MCR), programmable data rate (clock) divisor registers (DLL/
DLM/DLD), and a user accessible Scratchpad Register (SPR).
Beyond the general 16C2550 features and capabilities, the V2650 offers enhanced feature registers (EFR,
Xon/Xoff 1, Xon/Xoff 2) that provide automatic RTS and CTS hardware flow control, and Xon/Xoff software flow
control. All the register functions are discussed in full detail later in “Section 3.0, UART INTERNAL
2.7
DMA Mode
The device does not support direct memory access. The DMA Mode (a legacy term) in this document doesn’t
mean “direct memory access” but refers to data block transfer operation. The DMA mode affects the state of
the RXRDY# A/B and TXRDY# A/B output pins. The transmit and receive FIFO trigger levels provide additional
flexibility to the user for block mode operation. The LSR bits 5-6 provide an indication when the transmitter is
empty or has an empty location(s) for more data. The user can optionally operate the transmit and receive
FIFO in the DMA mode (FCR bit-3=1). When the transmit and receive FIFO are enabled and the DMA mode is
disabled (FCR bit-3 = 0), the V2650 is placed in single-character mode for data transmit or receive operation.
When DMA mode is enabled (FCR bit-3 = 1), the user takes advantage of block mode operation by loading or
unloading the FIFO in a block sequence determined by the selected trigger level. In this mode, the V2650 sets
the TXRDY# pin when the transmit FIFO becomes full, and sets the RXRDY# pin when the receive FIFO
becomes empty. The following table shows their behavior. Also see Figures 17through 22.
TABLE 1: CHANNEL A AND B SELECT
CSA#
CSB#
FUNCTION
1
UART de-selected
0
1
Channel A selected
1
0
Channel B selected
0
Channel A and B selected
TABLE 2: TXRDY# AND RXRDY# OUTPUTS IN FIFO AND DMA MODE
PINS
FCR BIT-0=0
(FIFO DISABLED)
FCR BIT-0=1 (FIFO ENABLED)
FCR BIT-3 = 0
(DMA MODE DISABLED)
FCR BIT-3 = 1
(DMA MODE ENABLED)
RXRDY# A/B LOW = 1 byte
HIGH = no data
LOW = at least 1 byte in FIFO
HIGH = FIFO empty
HIGH to LOW transition when FIFO reaches the
trigger level, or time-out occurs
LOW to HIGH transition when FIFO empties
TXRDY# A/B LOW = THR empty
HIGH = byte in THR
LOW = FIFO empty
HIGH = at least 1 byte in FIFO
LOW = FIFO has at least 1 empty location
HIGH = FIFO is full
相關(guān)PDF資料
PDF描述
AQ1056N8J-T INDUCTOR 6.8NH 420MA 0402 SMD
H3DWH-6006G IDC CABLE - HKR60H/AE60G/HPL60H
GEM22DTMI CONN EDGECARD 44POS R/A .156 SLD
RCM11DREF CONN EDGECARD 22POS .156 EYELET
GEM22DTBI CONN EDGECARD 44POS R/A .156 SLD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16V2650IM-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
XR16V2650IMTR-F 制造商:Exar Corporation 功能描述:UART 2-CH 32Byte FIFO 2.5V/3.3V 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR16V2650IMTR-F
XR16V2651 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE
XR16V2651_07 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE
XR16V2651IL 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

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(jìn)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(jìn)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

*
*
*