CY7C65640A
Document #: 38-08019 Rev. *I
Page 7 of 21
Unused port DD+/DD– lines can be left floating. The port power, amber, and green LED pins should be left unconnected, and the
overcurrent pin should be tied HIGH. The overcurrent pin is an input and it should not be left floating.
7.0
Default Descriptors
7.1
Device Descriptor
The standard device descriptor for TetraHub is based on the VID, PID, and DID found in the SPI EEPROM. This VID/PID/DID in
the EEPROM will overwrite the default VID/PID/DID. If no EEPROM is used, the TetraHub will enumerate with the default
descriptor values as shown below.
DOWNSTREAM PORT 1
13
DD–[1]
I/O/Z
Z
Downstream D– Signal.
14
DD+[1]
I/O/Z
Z
Downstream D+ Signal.
36
AMBER#[1]
O
1
LED. Driver output for Amber LED. Port Indicator Support. Active LOW.
35
GREEN#[1]
O
1
LED. Driver output for Green LED. Port Indicator Support. Active LOW.
30
OVR#[1]
Input
1
Overcurrent Condition Detection Input. Active LOW.
29
PWR#[1]
O/Z
Z
Power Switch Driver Output. Active LOW.
DOWNSTREAM PORT 2
9
DD–[2]
I/O/Z
Z
Downstream D– Signal.
10
DD+[2]
I/O/Z
Z
Downstream D+ Signal.
38
AMBER#[2]
O
1
LED. Driver output for Amber LED. Port Indicator Support. Active LOW.
37
GREEN#[2]
O
1
LED. Driver output for Green LED. Port Indicator Support. Active LOW.
32
OVR#[2]
Input
1
Overcurrent Condition Detection Input. Active LOW.
31
PWR#[2]
O/Z
Z
Power Switch Driver Output. Active LOW.
DOWNSTREAM PORT 3
5
DD–[3]
I/O/Z
Z
Downstream D– Signal.
6
DD+[3]
I/O/Z
Z
Downstream D+ Signal.
42
AMBER#[3]
O
1
LED. Driver output for Amber LED. Port Indicator Support. Active LOW.
41
GREEN#[3]
O
1
LED. Driver output for Green LED. Port Indicator Support. Active LOW.
53
OVR#[3]
Input
1
Overcurrent Condition Detection Input. Active LOW.
54
PWR#[3]
O/Z
Z
Power Switch Driver Output. Active LOW.
DOWNSTREAM PORT 4
1
DD–[4]
I/O/Z
Z
Downstream D– Signal.
2
DD+[4]
I/O/Z
Z
Downstream D+ Signal.
44
AMBER#[4]
O
1
LED. Driver output for Amber LED. Port Indicator Support. Active LOW.
43
GREEN#[4]
O
1
LED. Driver output for Green LED. Port Indicator Support. Active LOW.
51
OVR#[4]
Input
1
Overcurrent Condition Detection Input. Active LOW.
52
PWR#[4]
O/Z
Z
Power Switch Driver Output. Active LOW.
Table 6-1. Pin Assignments (continued)
Pin
Name
Type
Default
Description
Byte
Full Speed
High Speed
Field Name
Description
0
0x12
0x12
bLength
18 Bytes
1
0x01
0x01
bDescriptorType
DEVICE_DESCRIPTOR
2,3
0x0200
0x0200
bcdUSB
USB specification 2.0
4
0x09
0x09
bDeviceClass
HUB
5
0x00
0x00
bDeviceSubClass
None
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