Specifications

CY7C67200
Document Number: 38-08014 Rev. *J Page 42 of 93
Register Description
The Device n SOF/EOP Count register must be written with the
time expected between receiving a SOF/EOPs. If the SOF/EOP
counter expires before an SOF/EOP is received, an SOF/EOP
Timeout Interrupt can be generated. The SOF/EOP Timeout
Interrupt Enable and SOF/EOP Timeout Interrupt Flag are
located in the Device n Interrupt Enable and Status registers,
respectively.
The SOF/EOP count must be set slightly greater than the
expected SOF/EOP interval. The SOF/EOP counter decrements
at a 12-MHz rate. Therefore in the case of an expected 1-ms
SOF/EOP interval, the SOF/EOP count must be set slightly
greater then 0x2EE0.
Count (Bits [13:0])
The Count field contains the current value of the SOF/EOP down
counter. At power-up and reset, this value is set to 0x2EE0 and
for expected 1-ms SOF/EOP intervals, this SOF/EOP count
should be increased slightly.
Reserved
All reserved bits must be written as ‘0’.
OTG Control Registers
[9]
There is one register dedicated for OTG operation. This register
is covered in this section and summarized in Table 28.
OTG Control Register [0xC098] [R/W]
Figure 40. OTG Control Register
Register Description
The OTG Control register allows control and monitoring over the
OTG port on Port1A.
VBUS Pull-up Enable (Bit 13)
The VBUS Pull-up Enable bit enables or disables a 500 ohm
pull-up resistor onto OTG VBus.
1: 500 ohm pull-up resistor enabled
0: 500 ohm pull-up resistor disabled
Receive Disable (Bit 12)
The Receive Disable bit enables or powers down (disables) the
OTG receiver section.
1: OTG receiver powered down and disabled
0: OTG receiver enabled
Charge Pump Enable (Bit 11)
The Charge Pump Enable bit enables or disables the OTG VBus
charge pump.
1: OTG VBus charge pump enabled
0: OTG VBus charge pump disabled
VBUS Discharge Enable (Bit 10)
The VBUS Discharge Enable bit enables or disables a 2K-ohm
discharge pull-down resistor onto OTG VBus.
1: 2K-ohm pull-down resistor enabled
0: 2K-ohm pull-down resistor disabled
D+ Pull-up Enable (Bit 9)
The D+ Pull-up Enable bit enables or disables a pull-up resistor
on the OTG D+ data line.
1: OTG D+ dataline pull-up resistor enabled
0: OTG D+ dataline pull-up resistor disabled
D– Pull-up Enable (Bit 8)
The D– Pull-up Enable bit enables or disables a pull-up resistor
on the OTG D– data line.
1: OTG D– dataline pull-up resistor enabled
0: OTG D– dataline pull-up resistor disabled
Table 28. OTG Registers
Register Name Address R/W
OTG Control Register C098H R/W
Bit # 15 14 13 12 11 10 9 8
Field Reserved VBUS
Pull-up
Enable
Receive
Disable
Charge Pump
Enable
VBUS
Discharge
Enable
D+
Pull-up
Enable
D–
Pull-up
Enable
Read/Write - - R/W R/W R/W R/W R/W R/W
Default 0 0 0 0 0 0 0 0
Bit # 7 6 5 4 3 2 1 0
Field D+
Pull-down
Enable
D–
Pull-down
Enable
Reserved OTG Data
Status
ID
Status
VBUS Valid
Flag
Read/Write R/W R/W - - - R R R
Default 0 0 0 0 0 X X X
Note
9. Errata: The VBUS interrupt in the Host/Device Status Registers [0xC090 and 0xC0B0] and OTG Control Register [0xC098] triggers multiple times whenever VBUS
is turned on. It should only trigger once when VBUS rises above 4.4 V and once when VBUS falls from above 4.4 V to 0 V. For more information, see the Errata on
page 84.