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VT8235 データシート(PDF) 65 Page - VIA Technologies, Inc. |
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VT8235 データシート(HTML) 65 Page - VIA Technologies, Inc. |
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65 / 145 page  VT8235 V-Link South Bridge Revision 1.22 October 24, 2002 -59- Device 16 Function 3 USB 2.0 EHCI Registers UrpuytvrÃDp XrÃ8rp USB-Specific Configuration Registers Offset 40 - Miscellaneous Control 1 (40h) .......................RW 7 Reserved ........................................ always reads 0 6 Babble Option This bit controls whether the port is disabled when EOF (End-Of-Frame) babble occurs. Babble is unexpected bus activity that persists into the EOF interval. When this bit is 0, the port with the EOF babble is disabled. When it is 1, it is not disabled 0 Automatically disable babbled port when EOF babble occurs 1 Don’t disable babbled port ....................default 5 PCI Parity Check 0 Disable .................................................. default 1 Enable 4 Reserved (Do Not Program) .................... default = 0 3-2 Reserved ........................................ always reads 0 1 DMA Options 0 16 DW burst access ............................... default 1 8 DW burst access 0 Reserved ........................................ always reads 0 Offset 48 - Miscellaneous Control 1 (A0h) ......................RW 7-6 Reserved (Do Not Program) .................... default = 0 5 CCA Burst Access 0 Burst enable 1 Burst disable..........................................default 4-1 Reserved ........................................ always reads 0 0 Reserved (Do Not Program) .................... default = 0 Offset 49 - Miscellaneous Control 2 (20h) .......................RW 7-6 Reserved (Do Not Program) .................... default = 0 5 Clock Auto Stop 0 Disable, no stop 1 Enable, auto stop ...................................default 4 Auto Power Down Receiver Squelch Detector 0 Auto Power Down................................. default 1 Always Powered Up 3-0 Reserved ........................................ always reads 0 Offset 60 - Serial Bus Release Number (20h) .................. RO 7-0 Release Number ..........always reads 20h for USB 2.0 Offset 61 - Frame Length Adjust (20h)............................ RO Offset 63-62 – Port Wake Capability (0001h) ................. RO Offset 6B-68 - Legacy Support Extended Capability ..... RO 31-0 Capabilities .......................always reads 0000 0001h Offset 6F-6C - Legacy Support Control / Status ............ RW 31-0 Control / Status ..................always reads 0000 0000h Offset 84 – PM Capability Status .................................... RW 7-0 PM Capability Status 00 D0 .................................................... default 01 -reserved- 10 -reserved- 11 D3 Hot |
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