参数资料
型号: XR17V254IV-F
厂商: Exar Corporation
文件页数: 4/70页
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
标准包装: 60
特点: *
通道数: 4,QUART
FIFO's: 64 字节
规程: RS485
电源电压: 3.3V,5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
XR17V254
12
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.1
D3
COLD STATE
The V254 enters the state when power is removed from the device. All context is lost in this state and the V254
does not support PME# in this state. When power is restored, PCI RST# must be asserted and the V254 will
return to the D0 Uninitialized state with a full PCI 3.0 compliant power-on reset sequence. The V254 will set all
its registers and outputs to the power-on defaults just as at initial power up. The system software must then
fully initialize and re-configure the V254 to place it in the D0 Active state.
1.3
Special Read/Write Register to store User Information
This 32-bit register can be used to store user information and is writable only via the EEPROM. This is
implemented at an offset of 0x48 in the PCI Configuration Space immediately following the Power
Management Registers. This register can be used to store application-specific information which may be used
by the device driver to initialize the device appropriately.
NOTE: EWR=Read/Write from external EEPROM.
FIGURE 4. POWER STATE TRANSITIONS OF THE XR17V254
TABLE 3: SPECIAL READ/WRITE REGISTER
ADDRESS OFFSET
BITS
TYPE
DESCRIPTION
RESET VALUE
(HEX)
0x48
31:0
EWR
User Information Writable only through EEPROM
0x00000000
D0
Uninitialized
D3
hot
D3
cold
D0
Active
Power on +
PCI RST#
Power on +
PCI RST#
VCC Removed
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