| Line 22... |
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dual ported r/w memories to store text, text attributes and character bitmaps. The display memory is
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dual ported r/w memories to store text, text attributes and character bitmaps. The display memory is
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thirty-two bits wide of which only twenty seven bits are implemented, allowing 512 different
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thirty-two bits wide of which only twenty seven bits are implemented, allowing 512 different
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simultaneous characters to be displayed along with 512 background and foreground
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simultaneous characters to be displayed along with 512 background and foreground
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colors. The use of internal dual ported memories means that the text
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colors. The use of internal dual ported memories means that the text
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controller does not consume any memory bandwidth from the processor.</font></p>
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controller does not consume any memory bandwidth from the processor.</font></p>
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<p><font size="4">The address decodes for the text screen and attribute memory,
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character bitmap memory and register set area are all parameterized to allow a
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different address mapping.</font></p>
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<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">
|
<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">
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<tr>
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<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">
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<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">
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Address</td>
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Address</td>
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<td width="85%" 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">
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<td width="85%" 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">
|
| Line 79... |
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<td width="29%" 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 width="29%" 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">
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char code</td>
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char code</td>
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</tr>
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</tr>
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</table>
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</table>
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|
|
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<p style="margin-bottom: 0">Data written to the unimplemented bits is ignored
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and they will read back as zero.</p>
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<h2 style="margin-bottom: 0">Clocks</h2>
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<h2 style="margin-bottom: 0">Clocks</h2>
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<p style="margin-bottom: 0">The text video display controller uses two clocks, a
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<p style="margin-bottom: 0">The text video display controller uses two clocks, a
|
bus timing clock (clk_i) and a video timing clock (vclk), which can be
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bus timing clock (clk_i) and a video timing clock (vclk), which can be
|
completely independent.</p>
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completely independent.</p>
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|
|
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<p style="margin-bottom: 0">The core synchronizes the display relative to
|
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externally supplied horizontal and vertical synchronization signals.</p>
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<h2><font face="Arial"><b>Register Description</b></font></h2>
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<h2><font face="Arial"><b>Register Description</b></font></h2>
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<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">
|
<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">
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<tr>
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<tr>
|
<td width="11%" 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" height="19"><font face="Arial"><b>Reg. No.</b></font></td>
|
<td width="11%" 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" height="19"><font face="Arial"><b>Reg. No.</b></font></td>
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<td width="20%" 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" align="right" height="19">
|
<td width="20%" 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" align="right" height="19">
|
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Line 109... |
<td width="151%" 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" height="19"><font face="Arial"><b>Description</b></font></td>
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<td width="151%" 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" height="19"><font face="Arial"><b>Description</b></font></td>
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</tr>
|
</tr>
|
<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">0</font></td>
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<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>
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<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">
|
<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">
|
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dddddddd
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-------- nnnnnnnn</font></td>
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-------- nnnnnnnn</font></td>
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<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">
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<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">
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<font face="Arial">RW</font></td>
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<font face="Arial">RW</font></td>
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<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">
|
<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>
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<font face="Arial">number of columns</font></td>
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<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">
|
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<p style="margin-top: 0; margin-bottom: 0">nnn = number of columns</p>
|
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<p style="margin-top: 0; margin-bottom: 0">ddd = character output delay
|
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(default 3).</td>
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</tr>
|
</tr>
|
<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>
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<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>
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<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">-------- nnnnnnnn</font></td>
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<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">-------- nnnnnnnn</font></td>
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<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">
|
<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">
|
| Line 322... |
Line 335... |
<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"></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"></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"></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"></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"></td>
|
</tr>
|
</tr>
|
</table>
|
</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>
|
<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">
|
<p style="margin-bottom: 0"><span lang="en-ca"><font face="Arial" size="4">
|
rtfTextController</font></span></p>
|
rtfTextController</font></span></p>
|
<p style="margin-bottom: 0; margin-top:0"><font face="Arial">
|
<p style="margin-bottom: 0; margin-top:0"><font face="Arial">
|
<font color="#00FF00">module</font> <span lang="en-ca">rtfTextController</span>(rst_i,
|
<font color="#00FF00">module</font> <span lang="en-ca">rtfTextController</span>(rst_i,
|
