Altera SoCAL  16.0
The Altera SoC Abstraction Layer (SoCAL) API Reference Manual
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Register : Host Channel 4 DMA Address Register - hcdma4

Description

This register is used by the OTG host in the internal DMA mode to maintain the current buffer pointer for IN/OUT transactions. The starting DMA address must be DWORD-aligned.

Register Layout

Bits Access Reset Description
[31:0] RW 0x0 DMA Address

Field : DMA Address - hcdma4

Non-Isochronous: This field holds the start address of the 512 bytes page. The first descriptor in the list should be located in this address. The first descriptor may be or may not be ready. The core starts processing the list from the CTD value. This field holds the address of the 2*(nTD+1) bytes of locations in which the isochronous descriptors are present where N is based on nTD as per Table below

[31:N] Base Address [N-1:3] Offset [2:0] 000

HS ISOC FS ISOC

nTD N nTD N

7 6 1 4

15 7 3 5

31 8 7 6

63 9 15 7

127 10 31 8

255 11 63 9

[N-1:3] (Isoc):[8:3] (Non Isoc): Current Transfer Desc(CTD): Non Isochronous: This value is in terms of number of descriptors. The values can be from 0 to 63. 0 - 1 descriptor. 63 - 64 descriptors. This field indicates the current descriptor processed in the list. This field is updated both by application and the core. for example, if the application enables the channel after programming CTD=5, then the core will start processing the 6th descriptor. The address is obtained by adding a value of (8bytes*5=) 40(decimal) to DMAAddr. Isochronous: CTD for isochronous is based on the current frame/microframe value. Need to be set to zero by application.

Field Access Macros:

#define ALT_USB_HOST_HCDMA4_HCDMA4_LSB   0
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_MSB   31
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_WIDTH   32
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_SET_MSK   0xffffffff
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_CLR_MSK   0x00000000
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_RESET   0x0
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_GET(value)   (((value) & 0xffffffff) >> 0)
 
#define ALT_USB_HOST_HCDMA4_HCDMA4_SET(value)   (((value) << 0) & 0xffffffff)
 

Data Structures

struct  ALT_USB_HOST_HCDMA4_s
 

Macros

#define ALT_USB_HOST_HCDMA4_OFST   0x194
 
#define ALT_USB_HOST_HCDMA4_ADDR(base)   ALT_CAST(void *, (ALT_CAST(char *, (base)) + ALT_USB_HOST_HCDMA4_OFST))
 

Typedefs

typedef struct
ALT_USB_HOST_HCDMA4_s 
ALT_USB_HOST_HCDMA4_t
 

Data Structure Documentation

struct ALT_USB_HOST_HCDMA4_s

WARNING: The C register and register group struct declarations are provided for convenience and illustrative purposes. They should, however, be used with caution as the C language standard provides no guarantees about the alignment or atomicity of device memory accesses. The recommended practice for writing hardware drivers is to use the SoCAL access macros and alt_read_word() and alt_write_word() functions.

The struct declaration for register ALT_USB_HOST_HCDMA4.

Data Fields
uint32_t hcdma4: 32 DMA Address

Macro Definitions

#define ALT_USB_HOST_HCDMA4_HCDMA4_LSB   0

The Least Significant Bit (LSB) position of the ALT_USB_HOST_HCDMA4_HCDMA4 register field.

#define ALT_USB_HOST_HCDMA4_HCDMA4_MSB   31

The Most Significant Bit (MSB) position of the ALT_USB_HOST_HCDMA4_HCDMA4 register field.

#define ALT_USB_HOST_HCDMA4_HCDMA4_WIDTH   32

The width in bits of the ALT_USB_HOST_HCDMA4_HCDMA4 register field.

#define ALT_USB_HOST_HCDMA4_HCDMA4_SET_MSK   0xffffffff

The mask used to set the ALT_USB_HOST_HCDMA4_HCDMA4 register field value.

#define ALT_USB_HOST_HCDMA4_HCDMA4_CLR_MSK   0x00000000

The mask used to clear the ALT_USB_HOST_HCDMA4_HCDMA4 register field value.

#define ALT_USB_HOST_HCDMA4_HCDMA4_RESET   0x0

The reset value of the ALT_USB_HOST_HCDMA4_HCDMA4 register field.

#define ALT_USB_HOST_HCDMA4_HCDMA4_GET (   value)    (((value) & 0xffffffff) >> 0)

Extracts the ALT_USB_HOST_HCDMA4_HCDMA4 field value from a register.

#define ALT_USB_HOST_HCDMA4_HCDMA4_SET (   value)    (((value) << 0) & 0xffffffff)

Produces a ALT_USB_HOST_HCDMA4_HCDMA4 register field value suitable for setting the register.

#define ALT_USB_HOST_HCDMA4_OFST   0x194

The byte offset of the ALT_USB_HOST_HCDMA4 register from the beginning of the component.

#define ALT_USB_HOST_HCDMA4_ADDR (   base)    ALT_CAST(void *, (ALT_CAST(char *, (base)) + ALT_USB_HOST_HCDMA4_OFST))

The address of the ALT_USB_HOST_HCDMA4 register.

Typedef Documentation

The typedef declaration for register ALT_USB_HOST_HCDMA4.