GHWCFG4 

         User HW Config4 Register
Module Instance Base Address Register Address
i_usbotg_0_DWC_otg_intreg 0xFFB00000 0xFFB00050
i_usbotg_1_DWC_otg_intreg 0xFFB40000 0xFFB40050

Size: 32

Offset: 0x50

Access: RO

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

DescDMA

RO 0x1

DescDMAEnabled

RO 0x1

INEps

RO 0xF

DedFifoMode

RO 0x1

SessEndFltr

RO 0x0

BValidFltr

RO 0x0

AValidFltr

RO 0x0

VBusValidFltr

RO 0x0

IddgFltr

RO 0x0

NumCtlEps

RO 0xF

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

PhyDataWidth

RO 0x0

RESERVED

RO 0x0

ExtendedHibernation

RO 0x0

Hibernation

RO 0x0

AhbFreq

RO 0x1

PartialPwrDn

RO 0x0

NumDevPerioEps

RO 0x0

GHWCFG4 Fields

Bit Name Description Access Reset
31 DescDMA 
Scatter/Gather DMA configuration
 1'b0: Non Dynamic configuration
 1'b1: Dynamic configuration
Value Description
0x0 Non Dynamic configuration
0x1 Dynamic configuration
RO 0x1
30 DescDMAEnabled 
Scatter/Gather DMA configuration
 1'b0: Non-Scatter/Gather DMA configuration
 1'b1: Scatter/Gather DMA configuration
Value Description
0x0 Non-Scatter/Gather DMA configuration
0x1 Scatter/Gather DMA configuration
RO 0x1
29:26 INEps 
Number of Device Mode IN Endpoints Including Control
Endpoints (INEps)
Range 0 -15
 0 : 1 IN Endpoint
 1 : 2 IN Endpoints
 ....
15 : 16 IN Endpoints
Value Description
0xa In Endpoint 11
0xb In Endpoint 12
0xc In Endpoint 13
0xd In Endpoint 14
0xe In Endpoint 15
0xf In Endpoint 16
0x0 In Endpoint 1
0x1 In Endpoint 2
0x2 In Endpoint 3
0x3 In Endpoint 4
0x4 In Endpoint 5
0x5 In Endpoint 6
0x6 In Endpoint 7
0x7 In Endpoint 8
0x8 In Endpoint 9
0x9 In Endpoint 10
RO 0xF
25 DedFifoMode 
Enable Dedicated Transmit FIFO For device IN Endpoints
(DedFifoMode)
 1'b0 : Dedicated Transmit FIFO Operation not enabled.
 1'b1 : Dedicated Transmit FIFO Operation enabled.
Value Description
0x0 Dedicated Transmit FIFO Operation not enabled
0x1 Dedicated Transmit FIFO Operation enabled
RO 0x1
24 SessEndFltr 
session_end Filter Enabled (SessEndFltr)
 1'b0: No filter
 1'b1: Filter
Value Description
0x0 No filter
0x1 Filter
RO 0x0
23 BValidFltr 
b_valid Filter Enabled (BValidFltr)
 1'b0: No filter
 1'b1: Filter
Value Description
0x0 No Filter
0x1 Filter
RO 0x0
22 AValidFltr 
a_valid Filter Enabled (AValidFltr)
 1'b0: No filter
 1'b1: Filter
Value Description
0x0 No filter
0x1 Filter
RO 0x0
21 VBusValidFltr 
VBUS Valid Filter Enabled (VBusValidFltr)
 1'b0: No filter
 1'b1: Filter
Value Description
0x0 Vbus Valid Filter Disabled
0x1 Vbus Valid Filter Enabled
RO 0x0
20 IddgFltr 
IDDIG Filter Enable (IddgFltr)
 1'b0: No filter
 1'b1: Filter
Value Description
0x0 Iddig Filter Disabled
0x1 Iddig Filter Enabled
RO 0x0
19:16 NumCtlEps 
Number of Device Mode Control Endpoints in Addition to
Endpoint 0 (NumCtlEps)
Range: 0-15
Value Description
0xa End point 10
0xb End point 11
0xc End point 12
0xd End point 13
0xe End point 14
0xf End point 15
0x0 End point 0
0x1 End point 1
0x2 End point 2
0x3 End point 3
0x4 End point 4
0x5 End point 5
0x6 End point 6
0x7 End point 7
0x8 End point 8
0x9 End point 9
RO 0xF
15:14 PhyDataWidth 
UTMI+ PHY/ULPI-to-Internal UTMI+ Wrapper Data Width
(PhyDataWidth)
When a ULPI PHY is used, an internal wrapper converts ULPI to
UTMI+ .
 2'b00: 8 bits
 2'b01: 16 bits
 2'b10: 8/16 bits, software selectable
 Others: Reserved
Value Description
0x0 8 bits
0x1 16 bits
0x2 8/16 bits, software selectable
RO 0x0
13:8 RESERVED 
RESERVED
 RO 0x0
7 ExtendedHibernation 
Enable Hibernation
 1'b0: Extended Hibernation feature not enabled
 1'b1: Extended Hibernation feature enabled
Value Description
0x0 Extended Hibernation feature not enabled
0x1 Extended Hibernation feature enabled
RO 0x0
6 Hibernation 
Enable Hibernation (Hibernation)
 1'b0: Hibernation feature not enabled
 1'b1: Hibernation feature enabled
Value Description
0x0 Hibernation feature disabled
0x1 Hibernation feature enabled
RO 0x0
5 AhbFreq 
Minimum AHB Frequency Less Than 60 MHz (AhbFreq)
 1'b0: No
 1'b1: Yes
Value Description
0x0 Minimum AHB Frequency More Than 60 MHz
0x1 Minimum AHB Frequency Less Than 60 MHz
RO 0x1
4 PartialPwrDn 
Enable Partial Power Down (PartialPwrDn)
 1'b0: Partial Power Down Not Enabled
 1'b1: Partial Power Down Enabled
Value Description
0x0 Partial Power Down disabled
0x1 Partial Power Down enabled
RO 0x0
3:0 NumDevPerioEps 
Number of Device Mode Periodic IN Endpoints
(NumDevPerioEps)
Range: 0-15
RO 0x0