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hardware:copper_programming_model [2010/03/07 09:58]
gilgamesh 		hardware:copper_programming_model [2010/03/09 14:53]
gilgamesh
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 Copper can call the CPU's attention by filing an interrupt request in ''INTREQ''. It can also move data into ''COPLC//n//'' to form a loop. To stop, Copper can either wait for the impossible, or turn its own access to DMA off. Copper can call the CPU's attention by filing an interrupt request in ''INTREQ''. It can also move data into ''COPLC//n//'' to form a loop. To stop, Copper can either wait for the impossible, or turn its own access to DMA off.
 +
 +===== Copper and Blitter =====
 +
 +The ''CDANG'' bit in ''COPCON'' permits access to 1 the register address space between $40 and $7, including Blitter's registers.
 +
 +^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ ^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^  00  ^
 +| ||||||||||||||||::: | |||||||||||||||  cdang|
  
 ===== Copper Lists ===== ===== Copper Lists =====
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 During **WAIT** the memory bus will not be accessed, freeing it for different tasks. The bus is accessed at //uneven// memory cycles. During **WAIT** the memory bus will not be accessed, freeing it for different tasks. The bus is accessed at //uneven// memory cycles.
  
-^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ +^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ ^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ 
-|  VP  ||||||||  HP  |||||||1| |bfd|  VE  |||||||  HE  |||||||0|+|  VP  ||||||||  HP  |||||||1|::: |bfd|  VE  |||||||  HE  |||||||0|
  
   * ''VP'' vertical position 0,...,255: since there are 262 beam positions in NTSC, 0,...,6 refer to the last 7 lines before vertical blanking   * ''VP'' vertical position 0,...,255: since there are 262 beam positions in NTSC, 0,...,6 refer to the last 7 lines before vertical blanking
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 ==== MOVE ==== ==== MOVE ====
 moves data word into secified data register moves data word into secified data register
-^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ +^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ ^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ 
-|0|0|0|0|0|0|0|0|  DA  |||||| |0| | |  data  ||||||||||||||||+|0|0|0|0|0|0|0|0|  DA  |||||| |0|::: | |  data  ||||||||||||||||
  
   * ''DA'': the destination register's address   * ''DA'': the destination register's address
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 skip next instruction if video beam counter is greater or equal the argument skip next instruction if video beam counter is greater or equal the argument
  
-^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ +^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ ^15^14^13^12^11^10^09^08^07^06^05^04^03^02^01^00^ 
-|  VP  ||||||||  HP  |||||||1| |bfd|  VE  |||||||  HE  |||||||0|+|  VP  ||||||||  HP  |||||||1|::: |bfd|  VE  |||||||  HE  |||||||0|
  
 (see ''WAIT'' for reference) (see ''WAIT'' for reference)
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 |  COP2LC  |  080  |  2 words  | |  COP2LC  |  080  |  2 words  |
  
- 
-===== Copper and Blitter ===== 
- 
-The ''CDANG'' bit in ''COPCON'' permits access to 1 the register address space between $40 and $7, including Blitter's registers. 
- 
-^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ ^15^14^13^12^11^10^9^8^7^6^5^4^3^2^1^0^ 
-| |||||||||||||||| | |||||||||||||||  cdang| 
  
hardware/copper_programming_model.txt · Last modified: 2010/03/09 14:53 by gilgamesh
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