URL
https://opencores.org/ocsvn/rtftextcontroller/rtftextcontroller/trunk
Subversion Repositories rtftextcontroller
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/rtftextcontroller/trunk
- from Rev 25 to Rev 26
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Rev 25 → Rev 26
/doc/rtftextcontroller3.html
24,6 → 24,9
simultaneous characters to be displayed along with 512 background and foreground |
colors. The use of internal dual ported memories means that the text |
controller does not consume any memory bandwidth from the processor.</font></p> |
<p><font size="4">The address decodes for the text screen and attribute memory, |
character bitmap memory and register set area are all parameterized to allow a |
different address mapping.</font></p> |
<table border="1" cellpadding="0" cellspacing="0" width="91%" style="border-left: 1.5pt solid black; border-right: 1.5pt solid black; border-top: 1.5pt solid black; border-bottom: .75pt solid black; background-color: white" fpstyle="27,011111100"> |
<tr> |
<td width="15%" style="font-weight: bold; color: white; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: 1.5pt solid black; background-color: gray"> |
81,6 → 84,9
</tr> |
</table> |
|
<p style="margin-bottom: 0">Data written to the unimplemented bits is ignored |
and they will read back as zero.</p> |
|
<h2 style="margin-bottom: 0">Clocks</h2> |
|
<p style="margin-bottom: 0">The text video display controller uses two clocks, a |
87,6 → 93,9
bus timing clock (clk_i) and a video timing clock (vclk), which can be |
completely independent.</p> |
|
<p style="margin-bottom: 0">The core synchronizes the display relative to |
externally supplied horizontal and vertical synchronization signals.</p> |
|
<h2><font face="Arial"><b>Register Description</b></font></h2> |
<table border="1" cellspacing="0" width="90%" style="border-left:1.5pt solid black; border-right:1.5pt solid black; border-top:1.5pt solid black; border-bottom:.75pt solid black; background-color:white" cellpadding="2" fpstyle="27,011111100" height="658"> |
<tr> |
102,12 → 111,16
<tr> |
<td width="11%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" height="17"><font face="Arial">0</font></td> |
<td width="20%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" align="right" height="17"><font face="Arial"> |
dddddddd |
-------- nnnnnnnn</font></td> |
<td width="9%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" align="center" height="17"> |
<font face="Arial">RW</font></td> |
<td width="19%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" height="17"> |
<font face="Arial">number of columns</font></td> |
<td width="151%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" height="17"></td> |
<td width="151%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" height="17"> |
<p style="margin-top: 0; margin-bottom: 0">nnn = number of columns</p> |
<p style="margin-top: 0; margin-bottom: 0">ddd = character output delay |
(default 3).</td> |
</tr> |
<tr> |
<td width="11%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" height="17"><font face="Arial">1</font></td> |
324,7 → 337,74
<td width="151%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white" height="17"></td> |
</tr> |
</table> |
<p style="margin-bottom: 0"> </p> |
<h2 style="margin-bottom: 0"><b>Graphics</b></h2> |
<p style="margin-bottom: 0">The core may be used as a low resolution graphics |
controller via the programmable character set. The characters can be programmed |
for block graphics. For instance each character could be a two by two grid of |
pixels. Sixteen different characters would be required to represent all the |
different combinations. It is also possible to program characters to a three by |
three grid of pixels using all 512 programmable characters to represent every |
possible combination of on/off pixels. The default resolution is 84x31 or |
(672x248 pixels). This would allow approximately a 224x82 graphics display.</p> |
<p style="margin-bottom: 0">Graphics and text may be intermixed by allocating |
part of the programmable character set for a graphic arrray. For instance using |
256 programmable characters a 128x128 bitmapped display can be created.</p> |
<h2 style="margin-bottom: 0"><b>Core Parameters</b></h2> |
<table border="1" cellpadding="0" cellspacing="0" width="90%" style="border-left: 1.5pt solid black; border-right: 1.5pt solid black; border-top: 1.5pt solid black; border-bottom: .75pt solid black; background-color: white" fpstyle="27,011111100"> |
<tr> |
<td width="8%" style="font-weight: bold; color: white; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: 1.5pt solid black; background-color: gray"> |
Name</td> |
<td width="13%" align="center" style="font-weight: bold; color: white; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: 1.5pt solid black; background-color: gray"> |
Default Value</td> |
<td width="129%" style="font-weight: bold; color: white; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: 1.5pt solid black; background-color: gray"> |
Description</td> |
</tr> |
<tr> |
<td width="8%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
COLS</td> |
<td width="13%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
84</td> |
<td width="129%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
default number of columns of text</td> |
</tr> |
<tr> |
<td width="8%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
ROWS</td> |
<td width="13%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
31</td> |
<td width="129%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
default number of rows of text</td> |
</tr> |
<tr> |
<td width="8%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
pTextAddress</td> |
<td width="13%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
$FFD00000</td> |
<td width="129%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
address of the shared text memory as addressed by the processor</td> |
</tr> |
<tr> |
<td width="8%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
pBitmapAddress</td> |
<td width="13%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
$FFD20000</td> |
<td width="129%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
address of the character bitmaps as addressed by the processor</td> |
</tr> |
<tr> |
<td width="8%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
pRegAddress</td> |
<td width="13%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
$FFDA0000</td> |
<td width="129%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> |
address of the register set</td> |
</tr> |
<tr> |
<td width="8%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> </td> |
<td width="13%" align="center" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> </td> |
<td width="129%" style="font-weight: normal; color: black; border-left-style: none; border-right-style: none; border-top-style: none; border-bottom: .75pt solid black; background-color: white"> </td> |
</tr> |
</table> |
<h2 style="margin-bottom: 0"><b><span lang="en-ca">Module Interface Description</span></b></h2> |
<p style="margin-bottom: 0"><span lang="en-ca"><font face="Arial" size="4"> |
rtfTextController</font></span></p> |