CY7C66013C Datasheet, PDF (40/61 Pages) Cypress Semiconductor – Full-Speed USB (12 Mbps) Peripheral Controller with Integrated Hub

CY7C66013C
CY7C66113C
Hub Ports Data
Bit #
Bit Name
Read/Write
Reset
7
Reserved
-
0
6
Reserved
-
0
ADDRESS 0x50
5
4
3
2
1
0
Reserved
Reserved
Port 4 Diff. Data Port 3 Diff. Data Port 2 Diff. Data Port 1 Diff. Data
-
-
R
R
R
R
0
0
0
0
0
0
Figure 18-7. Hub Ports Data Register
Bit [0..3]: Port x Diff Data (where x = 1..4)
Set to 1 if D+ > D– (forced differential 1, if signal is differential, i.e. not a SE0 or SE1). Set to 0 if D– > D+ (forced differential
0, if signal is differential, i.e., not a SE0 or SE1);
Bit [7..4]: Reserved.
18.4 Downstream Port Suspend and Resume
The Hub Ports Suspend Register (Figure 18-8) and Hub Ports Resume Status Register (Figure 18-9) indicate the suspend and
resume conditions on downstream ports. The suspend register must be set by firmware for any ports that are selectively
suspended. Also, this register is only valid for ports that are selectively suspended.
If a port is marked as selectively suspended, normal USB traffic is not sent to that port. Resume traffic is also prevented from
going to that port, unless the Resume comes from the selectively suspended port. If a resume condition is detected on the port,
hardware reflects a Resume back to the port, sets the Resume bit in the Hub Ports Resume Register, and generates a hub
interrupt.
If a disconnect occurs on a port marked as selectively suspended, the suspend bit is cleared.
The Device Remote Wakeup bit (bit 7) of the Hub Ports Suspend Register controls whether or not the resume signal is propagated
by the hub after a connect or a disconnect event. If the Device Remote Wakeup bit is set, the hub will automatically propagate
the resume signal after a connect or a disconnect event. If the Device Remote Wakeup bit is cleared, the hub will not propagate
the resume signal. The setting of the Device Remote Wakeup flag has no impact on the propagation of the resume signal after
a downstream remote wakeup event. The hub will automatically propagate the resume signal after a remote wakeup event,
regardless of the state of the Device Remote wakeup bit. The state of this bit has no impact on the generation of the hub interrupt.
These registers are cleared on reset or USB bus reset.
Hub Ports Suspend
ADDRESS 0x4D
Bit #
7
6
5
4
3
2
1
0
Bit Name
Device Remote Reserved
Wakeup
Reserved
Reserved
Port 4
Selective
Suspend
Port 3
Selective
Suspend
Port 2
Selective
Suspend
Port 1
Selective
Suspend
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
Figure 18-8. Hub Ports Suspend Register
Bit [0..3]: Port x Selective Suspend (where x = 1..4)
Set to 1 if Port x is Selectively Suspended; Set to 0 if Port x Do not suspend.
Bit 7: Device Remote Wakeup.
When set to 1, Enable hardware upstream resume signaling for connect/disconnect events during global resume.
When set to 0, Disable hardware upstream resume signaling for connect/disconnect events during global resume.
Hub Ports Resume
ADDRESS 0x4E
Bit #
7
6
5
4
3
2
1
0
Bit Name
Reserved
Reserved
Reserved
Reserved
Resume 4
Resume 3
Resume 2
Resume 1
Read/Write
-
-
-
-
R
R
R
R
Reset
0
0
0
0
0
0
0
0
Figure 18-9. Hub Ports Resume Status Register
Bit [0..3]: Resume x (where x = 1..4)
When set to 1 Port x requesting to be resumed (set by hardware); default state is 0;
Bit [7..4]: Reserved.
The Reserved bits [7..4] should always read as ‘0’.
Resume from a selectively suspended port, with the hub not in suspend, typically involves these actions:
Document #: 38-08024 Rev. *B
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