参数资料
| 型号： | XR17V252IM |
| 厂商： | Exar Corporation |
| 文件页数： | 7/69页 |
| 文件大小： | 0K |
| 描述： | IC UART PCI BUS DUAL 100TQFP |
| 产品变化通告： | Leaded UART, V&I Obsolescence 11/Apr/2011 |
| 标准包装： | 90 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 64 字节 |
| 规程： | RS485 |
| 电源电压： | 3.3V，5V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-TQFP |
| 供应商设备封装： | 100-TQFP（14x14） |
| 包装： | 托盘 |
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XR17V252
15
REV. 1.0.2
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
1.6.1
The Global Interrupt Register
The XR17V252 has a 32-bit wide register [INT0, INT1, INT2 and INT3] to provide interrupt information and
supports two interrupt schemes. The first scheme uses bits 0 to 1 of an 8-bit indicator (INT0) representing
channels 0 to 1 of the XR17V252, respectively. This permits the interrupt routine to quickly vector and serve
that UART channel and determine the source(s) in each individual routines. INT0 bit-0 represents the interrupt
status for UART channel 0 when its transmitter, receiver, line status, or modem port status requires service.
INT0 bit-1 provides interrupt status for channel 1 and bits 2 to 7 are reserved and remain at a logic 0.
The second scheme provides detail about the source of the interrupts for each UART channel. All the interrupts
are encoded into a 3-bit code per channel. This 3-bit code represents 7 interrupts corresponding to individual
UART’s transmitter, receiver, line status, modem port status. INT1 and INT2 registers provide the 6-bit interrupt
status for both channels. Bits 8, 9 and 10 represents channel 0 and bits 11,12 and 13 represents channel 1.
Bits 14 to 31 are reserved and remain at logic zero. Both channels interrupt status are available with a single
DWORD read operation. This feature allows the host to quickly vector and serve the interrupts, reducing
service interval, hence, reducing host bandwidth requirements. Figure 5 shows the 4-byte interrupt register
and its make up.
A special interrupt condition is generated by the V252 when it wakes up from sleep mode. This special
interrupt is cleared by reading the INT0 register. If there are not any other interrupts pending, the value read
from INT0 would be 0x00.
INT0 [7:0] Channel Interrupt Indicator
Each bit gives an indication of the channel that has requested for service. Bit-0 represents channel 0 and bit-1
indicates channel 1. Logic 1 indicates that a channel has requested for service. Bits 2 to 7 are reserved and
remain at logic zero The interrupt bit clears after reading the appropriate register of the interrupting channel
register, see Interrupt Clearing section.
TABLE 7: DEVICE CONFIGURATION REGISTERS SHOWN IN DWORD ALIGNMENT
ADDRESS
REGISTER
BYTE 3 [31:24]
BYTE 2 [23:16]
BYTE 1 [15:8]
BYTE 0 [7:0]
0x080
-083
INTERRUPT (read-only)
INT3
INT2[
INT1
INT0
0x084-087
TIMER (read/write)
TIMERMSB
TIMERLSB
TIMER (reserved)
TIMERCNTL
0x088-08B
ANCILLARY1 (read/write)
SLEEP
RESET
REGA
8XMODE
0x08C-08F
ANCILLARY2 (read-only)
MPIOINT
REGB
DVID
DREV
0x090-093
MPIO (read/write)
MPIOSEL
MPIOINV
MPIO3T
MPIOLVL
GLOBAL INTERRUPT REGISTER (DWORD)
[default 0x00-00-00-00]
INT3 [31:24]
INT2 [23:16]
INT1 [15:8]
INT0 [7:0]
The INT0 register provides status for each channel
IN T0 R eg is ter
In dividual U A R T C hannel Inte rrupt S tatus
Rs vd
Rs vd R s vd Ch -1 Ch -0
B it-7
B it-6
B it-5 B it-4
B it-3
B it-2
B it-1
B it-0
Rsvd Rsvd Rs vd
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| XR17V252IM-0A-EVB | 功能描述:UART 接口集成电路 Supports V252 100 ld TQFP, PCI Interface 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 |
| XR17V252IM-F | 功能描述:UART 接口集成电路 66MHz Dual PCI UART 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 |
| XR17V252IMTR-F | 制造商:Exar Corporation 功能描述:UART 2-CH 64Byte FIFO 3.3V 100-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR17V252IMTR-F |
| XR17V254 | 制造商:EXAR 制造商全称:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT |
| XR17V254_08 | 制造商:EXAR 制造商全称:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT |
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