Product specifications

VT8237R Data Sheet
Revision 2.06 December 15, 2004 -89- Device 16 Function 5 USB Direct Device Communications Registers
USB-Device-Communications-Specific Registers
USB Device Communications Control
Offset 40 - Miscellaneous Control 1 (00h).......................RW
7-2 Reserved ........................................ always reads 0
1 DMA Options
0 16 DW burst access................................default
1 8 DW burst access
0 Reserved ........................................ always reads 0
Offset 41 - Miscellaneous Control 2 (00h).......................RW
7-1 Reserved ........................................ always reads 0
0 IRQ Generation Test
0 Normal operation ...................................default
1 Generate USB IRQ
Offset 42 - Miscellaneous Control 3 (00h).......................RW
7-5 Reserved ........................................ always reads 0
4 Subsystem ID / Subvendor ID Backdoor
0 Disable (Rx2F-2C are RO) ....................default
1 Enable (Rx2F-2C are RW)
3-0 Reserved ........................................ always reads 0
Offset 44 - PHY Signal Monitoring 1 (00h).....................RW
7-1 Reserved ........................................ always reads 0
0 PHY Signal Monitoring
0 Disable ...................................................default
1 Enable
Offset 45 - PHY Signal Monitoring 2 (00h).....................RW
7-4 Reserved ........................................ always reads 0
3 PHY Signal Status - Receive Data
2 PHY Signal Status - Squelch
1 PHY Signal Status - Disconnect
0 PHY Signal Status – Term On
Offset 48 - Miscellaneous Control 5 (A0h) ..................... RW
7 USB 2.0 EOP Pattern (FEh) Error Check
0 Enable
1 Disable ................................................. default
6 Reserved ........................................always reads 0
5 CCA Burst Access
0 Enable
1 Disable ................................................. default
4-0 Reserved ........................................always reads 0
Offset 49 - Miscellaneous Control 6 (60h) ...................... RW
7 Reserved ........................................always reads 0
6 Full Speed Clock Auto Stop
0 Disable (no stop)
1 Enable (auto stop)................................. default
5 High Speed Clock Auto Stop
0 Disable (no stop)
1 Enable (auto stop)................................. default
4 Auto Power Down Receiver Squelch Detector
0 Enable (auto power down).................... default
1 Disable (always powered up)
3-0 Reserved ........................................always reads 0