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DAN-183 Datasheet(PDF) 4 Page - Exar Corporation

Part # DAN-183
Description  MIGRATING FROM THE XR17D15X TO THE XR17V25X
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

DAN-183 Datasheet(HTML) 4 Page - Exar Corporation

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DATA COMMUNICATIONS APPLICATION NOTE
DAN183
4
al bit. The table below lists the different Timer/Counter functions and how they are controlled in the XR17D15x
and the XR17V25x. For a detailed description of the Timer/Counter, see the XR17V25x datasheet.
3.6
TRANSMITTER AND RECEIVER DISABLE
The Transmitter and Receive can be disabled in the XR17V25x. This feature is not available in the XR17D15x.
The Transmitter is disabled when MSR bit-3 = 1 (write-only). When the Transmitter is disabled, any data left or
written into the TX FIFO will not be transmitted. It will resume transmission when MSR bit-3 has been reset.
Similarly, the Receiver is disabled when MSR bit-2 = 1 (write-only). When the Receiver is disabled, it will ig-
nore any data received during that time at the RX pin. It will receive data normally when MSR bit-2 has been
reset. See the XR17V25x datasheet for complete details.
3.7
TXCHAR IMMEDIATE
TXCHAR Immediate is another new feature in the XR17V25x. One byte of data can be inserted into the Trans-
mit Shift Register, ahead of any data that is remaining in the TX FIFO, after the current byte has shifted out.
This is done by writing to MCR bit-3 (assuming EFR bit-4 = 1) and then writing to the THR register. This fea-
ture can only be used when the Transmitter has not been disabled. See the XR17V25x datasheet for complete
details.
3.8
TX XON/XOFF INDICATOR
In the XR17D15x, the XCHAR register would indicate which flow control character (XON or XOFF) was re-
ceived last by a particular channel. If bit-0 = 1, then the last flow control character received was an XOFF. If
bit-1 = 1, then the last flow control character received was an XON. In addition to that, the XR17V25x has 2
additional bits to indicate whether the last flow control character transmitted was an XON or XOFF character. If
XCHAR bit-2 = 1, then the last flow control character transmitted was an XOFF character. If XCHAR bit-3 = 1,
then the last flow control character transmitted was an XON character.
4.0
CONCLUSION
The XR17V25x is an enhanced version of the XR17D15x with a faster PCI bus clock, higher data rate, and
many new features. Because of these reasons, some hardware and software changes will be required to take
advantage of the performance of the 66MHz PCI clock and the other enhanced features of the XR17V25x.
TABLE 8: TIMER/COUNTER FUNCTIONS
TIMER/COUNTER FUNCTION
XR17D15X (BIT DRIVEN)
XR17V25X (COMMAND DRIVEN)
Disable Timer/Counter Interrupt
TIMERCNTL[0] = 0
TIMERCNTL[3:0] = 0010
Enable Timer/Counter Interrupt
TIMERCNTL[0] = 1
TIMERCNTL[3:0] = 0001
Stop or Pause Timer/Counter
TIMERCNTL[1] = 0
TIMERCNTL[3:0] = 1010
Start Timer/Counter
TIMERCNTL[1] = 1
TIMERCNTL[3:0] = 1001
Select Re-Triggerable Mode
TIMERCNTL[2] = 0
TIMERCNTL[3:0] = 0100
Select One-Shot Mode
TIMERCNTL[2] = 1
TIMERCNTL[3:0] = 0011
Select Internal Crystal Oscillator as clock source
for the Timer/Counter
TIMERCNTL[3] = 0
TIMERCNTL[3:0] = 0101
Select External Clock (via TMRCK input pin) as
clock source for the Timer/Counter
TIMERCNTL[3] = 1
TIMERCNTL[3:0] = 0110
De-Route Timer output from MPIO[0] pin
TIMERCNTL[4] = 0
TIMERCNTL[3:0] = 1000
Route Timer output to MPIO[0] pin
TIMERCNTL[4 = 1
TIMERCNTL[3:0] = 0111
Reset Timer
-
TIMERCNTL[3:0] = 1011


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