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16550 MCR WO? by Unknown on May 11, 2007			Not available!
Hi, Can anyone tell me why the "UART 16550 compatible" IP core has a write-only MCR register? The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT). Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, <<A HREF="http://www.vl.com.au">http://www.vl.com.au</A>> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266 Hi, Can anyone tell me why the "UART 16550 compatible" IP core has a write-only MCR register? The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT). Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266

16550 MCR WO? by Unknown on May 11, 2007			Not available!
Mark McDougall wrote: [q] Can anyone tell me why the "UART 16550 compatible" IP core has a write-only MCR register?[/q] And the fix is hidden in a bug named 'STUDENT'! :O Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, <<A HREF="http://www.vl.com.au">http://www.vl.com.au</A>> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266 Mark McDougall wrote: Can anyone tell me why the "UART 16550 compatible" IP core has a write-only MCR register? And the fix is hidden in a bug named 'STUDENT'! :O Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266

16550 MCR WO? by Unknown on May 12, 2007			Not available!
Mark McDougall wrote: [q] Hi, Can anyone tell me why the "UART 16550 compatible" IP core has a write-only MCR register? The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT).[/q] MCR is writable on a real NS16550A. -hpa Mark McDougall wrote: Hi, Can anyone tell me why the "UART 16550 compatible" IP core has a write-only MCR register? The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT). MCR is writable on a real NS16550A. -hpa

16550 MCR WO? by Unknown on May 14, 2007			Not available!
H. Peter Anvin wrote: [q] The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT).[/q] MCR is writable on a real NS16550A.[/q] Obviously, being a control register. But readable as well? Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, <<A HREF="http://www.vl.com.au">http://www.vl.com.au</A>> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266 H. Peter Anvin wrote: The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT). MCR is writable on a real NS16550A. Obviously, being a control register. But readable as well? Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266

16550 MCR WO? by Unknown on May 15, 2007			Not available!
Mark McDougall wrote: [q] H. Peter Anvin wrote: [q] The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT).[/q] MCR is writable on a real NS16550A.[/q] Obviously, being a control register. But readable as well? [/q] Err, I meant readable. -hpa Mark McDougall wrote: H. Peter Anvin wrote: The reason I ask is that the windows serial drivers do in fact read the MCR - implying that the registers are RW on a real device (the datasheet doesn't specifically state RO or RW AFAICT). MCR is writable on a real NS16550A. Obviously, being a control register. But readable as well? Err, I meant readable. -hpa

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