83Plus:Ports:4A - Revision history

Dr. D'nar: More information

2020-03-04T00:42:21Z

More information

Dr. D'nar: /* Comments */ clarify that bit 5 needs to be set for normal operation

2013-04-04T18:16:19Z

‎Comments: clarify that bit 5 needs to be set for normal operation

Thepenguin77 at 04:00, 28 October 2011

2011-10-28T04:00:55Z

Thepenguin77 at 02:48, 4 June 2011

2011-06-04T02:48:35Z

Thepenguin77 at 02:47, 4 June 2011

2011-06-04T02:47:40Z

Thepenguin77: Undo revision 9401 by Thepenguin77 (Talk)

2011-06-04T02:36:33Z

Undo revision 9401 by Thepenguin77 (Talk)

Thepenguin77 at 23:00, 3 June 2011

2011-06-03T23:00:09Z

Thepenguin77 at 22:50, 3 June 2011

2011-06-03T22:50:06Z

Thepenguin77: Created page with '4A - D+ Control D+ Control {{84P-Only Port|0A}} == Synopsis == '''Port Number:''' 4A '''Function:''' D+ Co…'

2011-06-03T02:39:54Z

Created page with '4A - D+ Control D+ Control {{84P-Only Port|0A}} == Synopsis == '''Port Number:''' 4A '''Function:''' D+ Co…'

New page

[[Category:83Plus:Ports:By Address|4A - D+ Control]] [[Category:83Plus:Ports:By Name|D+ Control]]
{{84P-Only Port|0A}}
== Synopsis ==
'''Port Number:''' 4A

'''Function:''' D+ Control

Using this port, you can control the D+ USB line. The USB controller doesn't even have to be powered.

=== Read Values ===
* Bit 0: Set if connected to computer.
* Bit 1: Set if not connected to computer. Flashes when talking to computer.
* Bit 2: Set if not connected to computer.
* Bit 3: If set, D+ is forced high. Max 0.79 mA.
* Bit 4: Only significant if bit 3 is set. If this is set, D+ gets extra power. Max total 1.52 mA.
* Bit 5: Unknown
* Bit 6: Always 0
* Bit 7: Always 0

=== Write Values ===
* Bits 0-2: No effect
* Bit 3: Set to force D+ high. Max output: 0.79
* Bit 4: If bit 3 is set. Setting this give D+ extra power. Max total output 1.52 mA.
* Bit 5: The OS insists that this is set.
* Bits 6-7: No effect

== Comments ==
If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.

@@ Line 1: / Line 1: @@
-[[Category:83Plus:Ports:By Address|4A - D- Control]] [[Category:83Plus:Ports:By Name|D- Control]]
+[[Category:83Plus:Ports:By Address|4A - Pull-up/down Control]] [[Category:83Plus:Ports:By Name|Pull-up/down Control]]
 {{84P-Only Port|02}}
 == Synopsis ==
 '''Port Number:''' 4A
-'''Function:''' D&#8722; Control
+'''Function:''' Pull-up/down Control
-Using this port, you can control the D&#8722; USB line. The USB controller doesn't even have to be powered.
+Controls low-level USB pull-up/pull-down resistors. Using this port, you can control the D&#8722; USB line. The USB controller doesn't even have to be powered.
 === Read Values ===
@@ Line 15: / Line 15: @@
 * Bit 4: Only significant if bit 3 is set. If this is set, D&#8722; gets extra power. Max total 1.52 mA.
 * Bit 5: Reset means D&#8722; is getting 0.05 V at 15&#956;A.
-* Bit 6: Always 0
+* Bits 6-7: No function
-* Bit 7: Always 0
 === Write Values ===
-* Bits 0-2: No effect
+* Bits 0-2: Read only
-* Bit 3: Set to force D&#8722; high. Max output: 0.79 mA.
+* Bit 3: Pull-up switch on D-, set to enable; forces D&#8722; high. Max output: 0.79 mA.
-* Bit 4: If bit 3 is set. Setting this give D&#8722; extra power. Max total output 1.52 mA.
+* Bit 4: Some kind of additional pull-up? Setting this give D&#8722; extra power. Max total output 1.52 mA.
-* Bit 5: Resetting this gives D&#8722; 0.05 V at 15&#956;A.
+* Bit 5: Pull-down switch, should be left set; resetting this gives D&#8722; 0.05 V at 15&#956;A.
-* Bits 6-7: No effect
+* Bits 6-7: No function
 == Comments ==
 If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.  If you don't, USB communications probably won't work.

← Older revision		Revision as of 18:16, 4 April 2013
Line 26:		Line 26:

	== Comments ==		== Comments ==
−	If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.	+	If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h. If you don't, USB communications probably won't work.

@@ Line 1: / Line 1: @@
-[[Category:83Plus:Ports:By Address|4A - D&#8722; Control]] [[Category:83Plus:Ports:By Name|D&#8722; Control]]
+[[Category:83Plus:Ports:By Address|4A - D- Control]] [[Category:83Plus:Ports:By Name|D- Control]]
 {{84P-Only Port|0A}}
 == Synopsis ==

@@ Line 1: / Line 1: @@
-[[Category:83Plus:Ports:By Address|4A - USB Line Control]] [[Category:83Plus:Ports:By Name|USB Line Control]]
+[[Category:83Plus:Ports:By Address|4A - D+ Control]] [[Category:83Plus:Ports:By Name|D+ Control]]
 {{84P-Only Port|0A}}
 == Synopsis ==
 '''Port Number:''' 4A
-'''Function:''' USB Line Control
+'''Function:''' D+ Control
-Using this port, you can control the D+ from an A-type connector and the D&#8722; line from a B-type connector.
+Using this port, you can control the D+ USB line. The USB controller doesn't even have to be powered.
 === Read Values ===
@@ Line 12: / Line 12: @@
 * Bit 1: Set if not connected to computer. Flashes when talking to computer.
 * Bit 2: Set if not connected to computer.
-* Bit 3: If set, the corresponding line is forced high. Max 0.79 mA.
+* Bit 3: If set, D+ is forced high. Max 0.79 mA.
-* Bit 4: Only significant if bit 3 is set. If this is set, the corresponding line gets extra power. Max total 1.52 mA.
+* Bit 4: Only significant if bit 3 is set. If this is set, D+ gets extra power. Max total 1.52 mA.
-* Bit 5: Reset means the corresponding line is getting 0.05 V at 15&#956;A.
+* Bit 5: Reset means D&#8722; is getting 0.05 V at 15&#956;A.
 * Bit 6: Always 0
 * Bit 7: Always 0
@@ Line 20: / Line 20: @@
 === Write Values ===
 * Bits 0-2: No effect
-* Bit 3: Set to force the corresponding line. Max output: 0.79 mA.
+* Bit 3: Set to force D+ high. Max output: 0.79 mA.
-* Bit 4: If bit 3 is set. Setting this give the corresponding line extra power. Max total output 1.52 mA.
+* Bit 4: If bit 3 is set. Setting this give D+ extra power. Max total output 1.52 mA.
-* Bit 5: Resetting this gives the corresponding line 0.05 V at 15&#956;A.
+* Bit 5: Resetting this gives D&#8722; 0.05 V at 15&#956;A.
 * Bits 6-7: No effect
 == Comments ==
-If you don't like USB protocol, you could try to use this port for communication, or maybe as a "ready" signal. Anyways, when you are done, output 20h.
+If you don't like USB protocol, you could try to use this port for communication, or for sound. Anyways, when you are done, output 20h.