Digi NS9750 - Manual (Page 783)

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U S B C o n t r o l l e r M o d u l e
HcRhPortStatus[1] register
Address: 9010 1054
The HcRhPortStatus register controls and reports port events on a per-port basis. The
lower word reflects port status; the upper word reflects the status change bits. If a
transaction (token through handshake) is in progress when a write to change port
status occurs, the resulting port status change must be postponed until the
transaction completes.
Register bit assignment
Bits Access Mnemonic Reset Description
D31:21 N/A Not used N/A Always write to 0.
D20 R/W PRSC 0b PortResetStatusChange
0 Port reset is not complete
1 Port reset is complete
Set at the end of the 10-ms port reset signal. The host
controller driver writes a 1 to clear this bit. Writing 0 has
no effect.
D19 R/W OCIC 0b PortOverCurrentIndicatorChange
0 No change in PortOverCurrentIndicator
1 PortOverCurrentIndicator has changed
Valid only if overcurrent conditions are reported on a per-
port basis. This bit is set when root hub changes the
PortOverCurrentIndicator bit. The host controller driver
writes a 1 to clear this bit. Writing 0 has no effect.
Table 444: HcRhPortStatus[1] register
13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 16 30
Reserved PRSC PESC CSC
Not used PES CCS
OCIC PSSC
LSDA PPS Not used PRS POCI PSS