CPLD and FPGA
ATCA-8310 Installation and Use (6806800M72D
)
290
This 8-bit read/write register has no effect on the UART. It is intended as a scratchpad register
for use by the programmer.
8.2.2.1.7 Programmable Baud Rate Generator
The UART contains a programmable Baud Rate Generator that is capable of taking the
UART_CLK input and dividing it by any divisor from 1 to (2 16 -1). The output frequency of the
Baud Rate Generator is 16 times the baud rate. Two 8-bit latches store the divisor in a 16-bit
binary format. These Divisor Latches must be loaded during initialization to ensure proper
operation of the Baud Rate Generator. If both Divisor Latches are loaded with 0, the 16X output
clock is stopped. Upon loading either of the Divisor latches, a 16-bit baud counter is
immediately loaded. This prevents long counts on initial load. Access to the Divisor latch can
be done with a word write.
The UART_CLK is the CLK_UART (48MHz) input divided by the pre-divider set by the Super IO
Configuration Register (Offset 0x29).
The baud rate of the data shifted in/out of the UART is given by:
Baud Rate = UART_CLK / (16X Divisor)
For example, if the pre-divider is 26 the UART_CLK is 1.8461538MHz. When the divisor is 12,
the baud rate is 9600.
Table 8-61 Scratch Register (SCR)
IO Address: Base + 7
Bit
Description
Default
Access
7:0
Scratch Register (SCR)
The scratch register is an 8 bit register that is intended for
the programmer's use as a scratch pad in the sense that it
temporarily holds the programmer's data without affecting
any other ACE operation.
PWR_GOOD: 0
GPP: r/w
Summary of Contents for ATCA-8310
Page 12: ...ATCA 8310 Installation and Use 6806800M72D Contents 12 Contents Contents ...
Page 26: ...ATCA 8310 Installation and Use 6806800M72D 26 List of Figures ...
Page 34: ...ATCA 8310 Installation and Use 6806800M72D About this Manual 34 About this Manual ...
Page 54: ...Hardware Preparation and Installation ATCA 8310 Installation and Use 6806800M72D 54 ...
Page 70: ...Controls Indicators and Connectors ATCA 8310 Installation and Use 6806800M72D 70 ...
Page 162: ...BIOS ATCA 8310 Installation and Use 6806800M72D 162 ...
Page 200: ...U Boot ATCA 8310 Installation and Use 6806800M72D 200 ...
Page 244: ...Intelligent Peripheral Management Controller ATCA 8310 Installation and Use 6806800M72D 244 ...
Page 438: ...CPLD and FPGA ATCA 8310 Installation and Use 6806800M72D 438 ...
Page 442: ...Replacing the Battery ATCA 8310 Installation and Use 6806800M72D 442 ...
Page 444: ...Related Documentation ATCA 8310 Installation and Use 6806800M72D 444 ...
Page 454: ...ATCA 8310 Installation and Use 6806800M72D Sicherheitshinweise 454 ...
Page 456: ...Index ATCA 8310 Installation and Use 6806800M72D 456 ...
Page 457: ...Index ATCA 8310 Installation and Use 6806800M72D 457 ...
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