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參數(shù)資料
| 型號(hào)： | XR17V254IV-F |
| 廠商： | Exar Corporation |
| 文件頁(yè)數(shù)： | 8/70頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC UART PCI BUS QUAD 144LQFP |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 特點(diǎn)： | * |
| 通道數(shù)： | 4，QUART |
| FIFO's： | 64 字節(jié) |
| 規(guī)程： | RS485 |
| 電源電壓： | 3.3V，5V |
| 帶自動(dòng)流量控制功能： | 是 |
| 帶IrDA 編碼器/解碼器： | 是 |
| 帶故障啟動(dòng)位檢測(cè)功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 144-LQFP |
| 供應(yīng)商設(shè)備封裝： | 144-LQFP（20x20） |
| 包裝： | 托盤 |
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XR17V254
16
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.1
1.6.1
The Global Interrupt Register
The XR17V254 has a 32-bit wide register [INT0, INT1, INT2 and INT3] to provide interrupt information and
supports two interrupt schemes. The first scheme is an 8-bit indicator representing all 4 channels with each bit
representing each channel from 0 to 3. 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. Other bits in
the INT0 register provide indication for the other channels with bit [3] representing UART channel 3
respectively. Bits 4 to 7 are reserved and remains at logic zero.
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. This 3-bit code represents 7 interrupts corresponding to individual UART’s
transmitter, receiver, line status, modem port status. INT1, INT2 and INT3 registers provide the 24-bit interrupt
status for all 4 channels. Bits [10:8] representing channel 0 and bits [19:17] representing channel 3
respectively. Bits [31:20] are reserved. All 4 channel interrupts status are available with a single DWORD read
operation. This feature allows the host quickly vectors and serves the interrupts, reducing service interval,
hence, reduce host bandwidth requirement.
All bits start up zero. A special interrupt condition is generated by the V254 upon awakening from sleep after all
four channels were put to sleep mode earlier. This wake-up interrupt is cleared by a read to the INT0 register.
shows the 4-byte interrupt register and its make up.
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 [3] indicates channel 3. Logic one indicates the channel N [3:0] has called for service. 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 individual status for each channel
INT0 Register
Individual UART Channel Interrupt Status
Rsvd
Ch-3
Ch-2
Ch-1
Ch-0
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
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| XR17V258 | 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT |
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| XR17V258IV | 功能描述:UART 接口集成電路 66MHz Octal PCI 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 |
| XR17V258IV-0A-EVB | 功能描述:UART 接口集成電路 Supports V258 144 ld TQFP, PCI Interface 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 |
| XR17V258IVF | 制造商:Exar Corporation 功能描述: |
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