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 Post subject: Audio ISA 24-bit audio load
PostPosted: Thu Feb 20, 2014 1:41 pm 
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Joined: Thu Jan 23, 2014 4:18 pm
Posts: 12
在 AndeStar_Audio_ISA_UM012_v1.4 第16頁
為什麼DRJ=0/1讀出來的值會不同?
一個是讀higher 3 bytes,一個是讀lower 3 bytes


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File comment: AndeStar_Audio_ISA_UM012_v1.4 Page 16
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 Post subject: Re: Audio ISA 24-bit audio load
PostPosted: Fri Feb 21, 2014 6:35 pm 
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Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
DRJ means “Destination register Right-Justification”. In 24-bit mode, it tells the 32-bit register file HW the signification part of the register data that a programmer wants to preserve when loading/storing the register data into a 24-bit word local memory since a byte will be dropped. If the local memory is 32-bit word, then no byte will be dropped. But for compatibility with an application developed with 24-bit word local memory in mind, we load data from the high or low 3 bytes based on the DRJ value.


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