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参数资料
| 型号： | XR17V252IM-0A-EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 19/69页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XR17V252 100TQFP |
| 标准包装： | 1 |
| 系列： | * |
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XR17V252
26
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.2
3.1.1
Normal Rx FIFO Data Unloading at locations 0x100 (channel 0) and 0x300 (channel 1)
The RX FIFO data (up to the maximum 64 bytes) can be read out in a single burst 32-bit read operation
(maximum 16 DWORD reads) at memory locations 0x100 (channel 0) and 0x300 (channel 1). This operation is
at least 16 times faster than reading the data in 64 separate 8-bit memory reads of RHR register (0x000 for
channel 0 and 0x200 for channel 1).
3.1.2
Special Rx FIFO Data Unloading at locations 0x180 (channel 0) and 0x380 (channel 1)
The XR17D152 also provides the same RX FIFO data along with the LSR status information of each byte side-
by-side, at locations 0x180 (channel 0) and 0x380 (channel 1). The entire RX data along with the status can be
downloaded in a single PCI Burst Read operation of 32 DWORD reads. The Status and Data bytes must be
read in 16 or 32 bits format to maintain data integrity. The following tables show this clearly.
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.
READ RX FIFO,
WITH LSR
ERRORS
BYTE 3
BYTE 2
BYTE 1
BYTE 0
Read n+0 to n+1
FIFO Data n+1
LSR n+1
FIFO Data n+0
LSR n+0
Read n+2 to n+3
FIFO Data n+3
LSR n+3
FIFO Data n+2
LSR n+2
Etc
PCI Bus
Data Bit-31
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
Receive Data Byte n+3
Receive Data Byte n+2
Receive Data Byte n+1
Receive Data Byte n+0
PCI Bus
Data Bit-0
Channel 0 to 1 ReceiveData in 32-bit alignment through the Configuration Register Address
0x0100 and 0x0300
PCI Bus
Data Bit-31
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
Receive Data Byte n+1
Line Status Register n+1
Receive Data Byte n+0
Line Status Register n+0
PCI Bus
Data Bit-0
Channel 0 to 1 Receive Data with Line Status Register in a 32-bit alignment through
the Configuration Register Address 0x0180 and 0x0380
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| XR17V254IV | 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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