參數(shù)資料
型號(hào): XR17D158
廠商: Exar Corporation
英文描述: UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
中文描述: 通用(3.3V和5V)PCI總線八進(jìn)制的UART
文件頁數(shù): 29/72頁
文件大?。?/td> 1520K
代理商: XR17D158
xr
REV. 1.2.1
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
XR17D158
29
5.0
UART
There are 8 UARTs [channels 7:0] in the D158. Each has its own 64-byte of transmit and receive FIFO, a set of
16550 compatible control and status registers, and a baud rate generator for individual channel data rate
setting. Eight additional registers per UART were added for the EXAR enhanced features.
5.1
Programmable Baud Rate Generator
Each UART has its own Baud Rate Generator (BRG) with a prescaler for the transmitter and receiver. The
prescaler is controlled by a software bit in the MCR register. The MCR register bit-7 sets the prescaler to divide
the input crystal or external clock by 1 or 4. The output of the prescaler clocks to the BRG. The BRG further
divides this clock by a programmable divisor between 1 and (2
16
-1) to obtain a 16X or 8X sampling clock of
the serial data rate. The sampling clock is used by the transmitter for data bit shifting and
receiver for data
sampling. The BRG divisor (DLL and DLM registers) defaults to a random value upon power up. Therefore, the
BRG must be programmed during initialization to the operating data rate.
Programming the Baud Rate Generator Registers DLM and DLL provides the capability for selecting the
operating data rate.
Table 10
shows the standard data rates available with a 14.7456 MHz crystal or external
clock at 16X clock rate. At 8X sampling rate, these data rates would double. When using a non-standard data
rate crystal or external clock, the divisor value can be calculated with the following equation(s).
F
IGURE
11. B
AUD
R
ATE
G
ENERATOR
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16),
WITH
8XMODE [7:0]
IS
0
divisor (decimal) = (XTAL1 clock frequency / prescaler / (serial data rate x 8),
WITH
8XMODE [7:0]
IS
1
XTAL1
XTAL2
Crystal
Osc/
Buffer
MCR Bit-7=0
(default)
MCR Bit-7=1
DLL and DLM
Registers
Prescaler
Divide by 1
Prescaler
Divide by 4
16X or 8X
Sampling
Rate Clock to
Transmitter
and Receiver
To Other
Channels
Baud Rate
Generator
Logic
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