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参数资料
| 型号： | XR17V354IB-E4-EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 14/66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
21
REV. 1.0.3
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
TIMER OPERATION
The following paragraphs describe the operation of the 16-bit Timer/Counter. The following conventions will be
used in this discussion:
■
’N’ is the 16-bit value programmed in the TIMER MSB, LSB registers
■
P +Q = N, where ’P’ and ’Q’ are approximately half of ’N’.
■
If N is even, P = Q = N/2.
■
If N is odd, P = (N – 1)/2 and Q = (N + 1)/2.
■
‘N’ can take any value from 0x0002 to 0xFFFF.
Timer Operation in One-Shot Mode:
In the one-shot mode, the Timer output will stay HIGH when started (default state) and will continue to stay
HIGH until it times out (reaches the terminal count of ‘N’ clocks), at which time it will become LOW and stay
LOW. If the Timer is re-started before the Timer times out, the counter is reset and the Timer will wait for
another time-out period before setting its output LOW (See Figure 6). If the Timer times out, re-starting the
Timer does not have any effect and a ’Stop Timer’ command needs to be issued first which will set the Timer
output to its default HIGH state. The Timer must be programmed while it is stopped since the following
operations are blocked after the Timer has been started:
■
Any write to TIMER MSB, LSB registers
■
Issue of any command other than ’Start Timer’, ’Stop Timer’ and ’Reset Timer’
Timer Operation in Re-triggerable Mode:
In the re-triggerable mode, when the Timer is started, the Timer output will stay HIGH until it reaches half of the
terminal count N (= P clocks) and toggle LOW and stay LOW for a similar amount of time (Q clocks). The
above step will keep repeating until the Timer is stopped at which time the output will become HIGH (default
state). See Figure 6. Also, after the Timer is started, re-starting the Timer does not have any effect in re-
triggerable mode. The Timer must be programmed while it is stopped since the following operations are
blocked when the Timer is running:
■
Any write to TIMER MSB, LSB registers
■
Issue of any command other than ’Stop Timer’ and ’Reset Timer’ (’Start Timer’ is not allowed)
Routing the Timer Output to MPIO[0] Pin:
MPIO[0] pin is by default (on power up or reset, for example) an input. However, whenever the Timer output is
routed to MPIO[0] pin,
■
MPIO[0] will be automatically selected as an output
■
MPIO[0] will become HIGH (the default state of Timer output)
■
All MPIO control registers (MPIOLVL, MPIOSEL etc) lose control over MPIO[0] and get the control back
only when the Timer output is de-routed from MPIO[0].
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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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