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Host (pci/usb) port. Over view. Host Port Selection. Configuration Spaces. PCI Configuration Space, страница 14

 

Address

Name

Comment
 

0x1060-0x1063

USB EP1 Code Current Write Pointer Offset

Current write pointer offset for code download on Endpoint 1
 

0x1064-0x1067

USB EP2 Code Current Write Pointer Offset

Current write pointer offset for code download on Endpoint 2
 

0x1068-0x106B

USB EP3 Code Current Write Pointer Offset

Current write pointer offset for code download on Endpoint 3
 
 

0x2000-0x2001

USB Register I/O Address
 

0x2002-0x2003

USB Register I/O Data
 
 

0x3000-0x3FFF

USB MCU Program Mem

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

  

TB

LT

LT

TY

TY

DR

PS

PS

PS

PS

PS

PS

PS

PS

PS

PS

  

Figure 8-3. USB Endpoint Description Register

The USB Endpoint Description Register provides the USB core with information about the Endpoint type, direction, and maximum packet size. This register is read/write by the MCU only. This register is defined for Endpoints[4:11].

Table 8-12. USB Endpoint Description Register

PS[9:0]

Maximum packet size for Endpoint

  

LT[1:0]

Last transaction handshake indicator bits sent by the ADSP-2192: 00 = Clear 01 = ACK 10 = NAK 11 = ERR

  

TY[1:0]

Endpoint type bits:

00 = DISABLED 01 = ISO 10 = Bulk 11 = Interrupt

  

DR

Endpoint direction bit: 1 = IN 0 = OUT

  

TB

Toggle bit for Endpoint. Reflects the current state of the DATA toggle bit.

  

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

X

X

X

X

X

X

X

X

X

X

NE

ST

NC

NC

NC

NC

Figure 8-4. USB Endpoint NAK Counter Register

The USB Endpoint NAK Counter Register contains the individual NAK count, stall control, and NAK counter enable bits for Endpoints 4-11. This register is read/write by the MCU only.

Table 8-13. USB Endpoint NAK Counter Register

 

NC[3:0]

NAK counter. Number of sequential NAKs that have occurred on a given Endpoint. When N[3:0] is equal to the base NAK counter NK[3:0] value in the Endpoint Stall Policy register, a zero-length packet or packet less than maxpacketsize will be issued.
 

ST

A value of 1 means: Endpoint is stalled
 

NE

1 = Enable NAK counter 0 = Disable NAK counter

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

  

NK

NK

NK

NK

X

X

X

X

X

TB3

TB2

TB1

ST3

ST2

ST1

FE

  
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