參數(shù)資料
型號(hào): XR17C152CM-0A-EVB
廠商: Exar Corporation
文件頁數(shù): 60/62頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XR17C152 100TQFP
標(biāo)準(zhǔn)包裝: 1
系列: *
á
XR17C152
REV. 1.2.0
5V PCI BUS DUAL UART
7
1.0
XR17C152 REGISTERS
The XR17C152 UART has three different sets of registers as shown in Figure 3. The PCI local bus
configuration space registers are for plug-and-play auto-configuration when connecting the device to the PCI
bus. This auto-configuration feature makes installation very easy into a PCI system and it is part of the PCI
local bus specification. The second register set is the device configuration registers that are accessible directly
from the PCI bus for programming general operating conditions of the device and monitoring the status of
various functions. These registers are mapped into 1K of the PCI bus memory address space. These functions
include both channel UART’s interrupt control and status, 16-bit general purpose timer control and status,
multipurpose inputs/outputs control and status, sleep mode, soft-reset, and device identification and revision.
And lastly, each UART channel has its own set of 5G internal UART configuration registers for its own
operation control and status reporting. Both sets of channel registers are embedded inside the device
configuration registers space, which provides faster access. The following paragraphs describe all 3 sets of
registers in detail.
FIGURE 3. THE XR17C152 REGISTER SETS
Channel 0
INT, MPIO,
TIMER, REG
Device Configuration and
UART[1:0] Configuration
Registers are mapped on
to the Base Address
Register (BAR) in a 1K-
byte of memory address
space
PCI Local Bus
Target
Interface
Channel 0
Channel 1
Device Configuration Registers
Global Source Interrupt,
Multipurpose I/Os,
16-bit Timer/Counter,
Sleep, Reset, DVID, DREV
UART[1:0] Configuration
Registers
16550 Compatible and EXAR
Enhanced Registers
PCI Local Bus
Configuration Space
Registers for Plug-
and-Play Auto
Configuration
152REGS
Vendor and Sub-vendor ID
and Product Model Number
in External EEPROM
0x0000
0x0200
0x0080
0x03FF
0x0100
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