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USB2422T-I/MJ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47
2013 - 2015 Microchip Technology Inc. DS00001726B-page 25
USB2422
4.4.8 CONFIGURATION DATA BYTE 2 REGISTER (CFG2)
Address: 07h Size: 8 bits
Bits Description Type Default
7 Dynamic Power Enable (DYNAMIC)
Controls the ability of the Hub to automatically change from Self-Powered
operation to Bus- Powered operation if the local power source is removed or
is unavailable (and from Bus-Powered to Self-Powered if the local power
source is restored).
Note: If the local power source is available, the Hub will always switch to
Self-Powered operation.
When Dynamic Power switching is enabled, the Hub detects the availability
of a local power source by monitoring the external LOCAL_PWR pin. If the
Hub detects a change in power source availability, the Hub immediately
disconnects and removes power from all downstream devices and
disconnects the upstream port. The Hub will then re-attach to the upstream
port as either a Bus-Powered Hub (if local-power is unavailable) or a Self-
Powered Hub (if local power is available).
0 = No Dynamic auto-switching
(pin becomes SUSP_IND) and the hub controller will utilize the inverse of the
SELF_BUS_PWR bit for 'Hub_Status_Field' bit '0' (local power source)
1 = Dynamic Auto-switching capable
(pin becomes LOCAL_PWR) and the hub controller will utilize the
LOCAL_PWR pin for 'Hub_Status_Field' bit '0' (local power source)
R/W 0b
6 RESERVED --
5:4 Over Current Timer Delay (OC_TIMER)
00 = 0.1ms
01 = 4ms
10 = 8ms
11 = 16ms
R/W 00b
3 Compound Device (COMPOUND)
Allows the OEM to indicate that the Hub is part of a compound (see the USB
Specification for definition) device. The applicable port(s) must also be
defined as having a “Non-Removable Device”.
Note: When configured via strapping options, declaring a port as non-
removable automatically causes the hub controller to report that it
is part of a compound device.
0 = No
1 = Yes, Hub is part of a compound device
R/W 0b
2:0 RESERVED --
USB2422
DS00001726B-page 26 2013 - 2015 Microchip Technology Inc.
4.4.9 CONFIGURATION DATA BYTE 3 REGISTER (CFG3)
4.4.10 NON-REMOVABLE DEVICE REGISTER (NRD)
Address: 08h Size: 8 bits
Bits Description Type Default
7:4 RESERVED --
3 Port Remapping Enable (PRTMAP_EN)
Selects the method used by the hub to assign port numbers and disable
ports
0 = Standard Mode
Strap options or the following registers are used to define which ports are
enabled, and the ports are mapped as Port'n' on the hub is reported as
Port'n' to the host, unless one of the ports is disabled, then the higher
numbered ports are remapped in order to report contiguous port numbers to
the host.
Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)
Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00).
1 = Port Re-Map mode
The mode enables remapping via Register FBh: Port Remap 12
R/W 0b
2:1 RESERVED --
0 String Enable (STRING_EN)
Enables string descriptor support.
0 = String support disabled
1 = String support enabled
R/W 0b
Address: 09h Size: 8 bits
Bits Description Type Default
7:0 Non-Removable Device (NR_DEVICE)
Indicates which port(s) include non- removable devices.
0 = port is removable
1 = port is non- removable
Informs the Host if one of the active physical ports has a permanent device
that is undetachable from the Hub.
Note: The device must provide its own descriptor data.
When using the internal default option, the NON_REM[1:0] pins will
designate the appropriate ports as being non- removable.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved
Bit 2= Port 2 non-removable
Bit 1= Port 1 non removable
Bit 0= Reserved
R/W 00h
2013 - 2015 Microchip Technology Inc. DS00001726B-page 27
USB2422
4.4.11 PORT DISABLE FOR SELF-POWERED OPERATION REGISTER (PDS)
4.4.12 PORT DISABLE FOR BUS-POWERED OPERATION REGISTER (PDB)
Address: 0Ah Size: 8 bits
Bits Description Type Default
7:0 Port Disable Self-Powered (PORT_DIS_SP)
Disables 1 or more ports.
0 = port is available
1 = port is disabled
During Self-Powered operation, when PRTMAP_EN = '0', this selects the
ports which will be permanently disabled, and are not available to be enabled
or enumerated by a Host Controller. The ports can be disabled in any order,
the internal logic will automatically report the correct number of enabled ports
to the USB Host, and will reorder the active ports in order to ensure proper
function.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved
Bit 2= Port 2 Disable
Bit 1= Port 1 Disable
Bit 0= Reserved
R/W 00h
Address: 0Bh Size: 8 bits
Bits Description Type Default
7:0 Port Disable Bus-Powered (PORT_DIS_BP)
Disables 1 or more ports.
0 = port is available
1 = port is disabled
During Bus-Powered operation, when PRTMAP_EN = '0', this selects the
ports which will be permanently disabled, and are not available to be enabled
or enumerated by a Host Controller. The ports can be disabled in any order,
the internal logic will automatically report the correct number of enabled ports
to the USB Host, and will reorder the active ports in order to ensure proper
function.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved
Bit 2= Port 2 Disable
Bit 1= Port 1 Disable
Bit 0= Reserved
R/W 00h
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47

USB2422T-I/MJ

Mfr. #:
Buy USB2422T-I/MJ
Manufacturer:
Microchip Technology
Description:
USB Interface IC Low Pin Count 2-Port USB 2.0 Hi-Speed Hub Controller
Lifecycle:
New from this manufacturer.
Delivery:
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