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参数资料
| 型号： | XR17V354IB-E4-EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 22/66页 |
| 文件大小： | 0K |
| 描述： | EVAL BRD FOR XR17V354-E4 176BGA |
| 产品培训模块： | PCIe UARTs |
| 标准包装： | 1 |
| 主要目的： | 接口，UART |
| 嵌入式： | 否 |
| 已用 IC / 零件： | XR17V354 |
| 已供物品： | 板 |
| 其它名称： | 1016-1612 XR17V354IB-E4-EVB-ND |
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XR17V354
29
REV. 1.0.3
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
2.0 TRANSMIT AND RECEIVE DATA
There are two methods to load transmit data and unload receive data from each UART channel. First, there is
a transmit data register and receive data register for each UART channel as shown in Table 4 set to ease
programming. These registers support 8, 16, 24 and 32 bits wide format. In the 32-bit format, it increases the
data transfer rate on the PCI bus. Additionally, a special register location provides receive data byte with its
associated error flags. This is a 16-bit or 32-bit read operation where the Line Status Register (LSR) content in
the UART channel register is paired along with the data byte. This operation further facilitates data unloading
with the error flags without having to read the LSR register separately. Furthermore, the XR17V354 supports
32-bit read/write operation of up to 256 bytes of data.
The second method is through each UART channel’s transmit holding register (THR) and receive holding
register (RHR). The THR and RHR registers are 16550 compatible so their access is limited to 8-bit format.
The software driver must separately read the LSR content for the associated error flags before reading the
data byte.
2.1
FIFO DATA LOADING AND UNLOADING IN 32-BIT FORMAT
The XR17V354 supports 32-bit Read and 32-bit Write transactions anywhere in the mapped memory region
(except reserved areas). In addition, to utilize this feature fully, the device provides a separate memory location
(apart from the individual channel’s register set) where the RX and the TX FIFO can be read from/written to, as
shown in Table 4. The following is an extract from the table showing the memory locations that support 32-bit
transactions:
Channel N: (for channels 0 through 3) where M = 4N + 1.
RX FIFO
:
0xM00 - 0xMFF (256 bytes)
TX FIFO
:
0xM00 - 0xMFF (256 bytes)
RX FIFO + status
:
0x(M+1)0 - 0x(M+2)FF (256 bytes data + 256 bytes status)
For example, the locations for channel 2 are:
Channel 2:
RX FIFO
:
0x0900 - 0x09FF (256 bytes)
TX FIFO
:
0x0900 - 0x09FF (256 bytes)
RX FIFO + status
:
0x0A00 - 0x0BFF (256 bytes data + 256 bytes status)
2.1.1
Normal Rx FIFO Data Unloading at locations 0x100, 0x500, 0x900 and 0xD00
The RX FIFO data can be read out 32 bits at a time at memory locations 0x100 (channel 0), 0x500 (channel 1),
0x900
(channel 2) and 0x0D00 (channel 3). This operation is 4 times faster than reading the data in 256
separate 8-bit memory reads of RHR register (0x000 for channel 0, 0x400 for channel 1, 0x800 for channel 2
and 0x0C00 for channel 3).
READ RX FIFO,
WITH NO ERRORS
BYTE 3
BYTE 2
BYTE 1
BYTE 0
Read n+0 to n+3
FIFO Data n+3
FIFO Data n+2
FIFO Data n+1
FIFO Data n+0
Read n+4 to n+7
FIFO Data n+7
FIFO Data n+6
FIFO Data n+5
FIFO Data n+4
Etc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR17V354IB-E8-EVB | 功能描述:界面开发工具 Eval Board for XR17V354IB-E8 RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR17V358 | 制造商:EXAR 制造商全称:EXAR 功能描述:HIGH PERFORMANCE OCTAL PCI EXPRESS UART |
| XR17V358IB-0A-EVB | 功能描述:界面开发工具 Eval Board for XR17V358IB-0A RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR17V358IB176-F | 功能描述:UART 接口集成电路 8 Channel PCIe UART w/256 Byte FIFO RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR17V358IB176-F | 制造商:Exar Corporation 功能描述:IC OCTAL UART 25MBPS 3.6V 176-BGA |
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