Host (pci/usb) port. Over view. Host Port Selection. Configuration Spaces. PCI Configuration Space, страница 18

		IN Transfers:				The MCU loads the counter with the number of bytes to transfer (must be 8 or less since the USB Setup Token Data Register file is 8 bytes maximum). The USB interface then decrements the count value after each byte is transferred to the host.
		OUT Transfers:				Starting from a cleared value of 0, the counter is decremented with each byte received from the host, including the two CRC bytes. For example, if 8 bytes are received, the count value progresses from 15, 14, 13, etc. to a value of 6 (inclusive is the 2 CRC bytes). The MCU reads the value and subtracts it from 14 to determine the actual number of data bytes in the USB Setup Token Register file (14 - 6 = 8 bytes).
15	14		13	12	11		10	9	8	7	6	5	4	3	2	1	0
A15	A14		A13	A12	A11		A10	A9	A8	A7	A6	A5	A4	A3	A2	A1	A0

Figure 8-13. USB Register I/O Address Register

The USB Register I/O Address Register contains the address of the ADSP-2192 register to be read/written. This register is read/write by the MCU only.

Table 8-17. USB Register I/O Address Register

A[15]		MCU sets to 1 to notify the PDC Register Interface block to start ADSP-2192 read/write cycle. PDC Register Interface block clears to 0 to notify MCU the read/write cycle has completed.
A[14]		1 = WRITE, 0 = READ
A[13:0]		ADSP-2192 address to read/write
15	14		13	12	11	10	9	8	7	6	5	4	3	2	1	0
D15	D14		D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0

Figure 8-14. USB Register I/O Data Register

The USB Register I/O Address Register contains the data of the

ADSP-2192 register that has been read or is to be written. This register is read/write by the MCU only.

Table 8-18. USB Register I/O Data Register

D[15:0]

During READ this register contains the data read from the ADSP-2192, during WRITE this register is the data to be written to the ADSP-2192

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
INT	ISE	IIN	IOU	BY	X	X	ER	X	X	X	X	RW	MO	BB	DI

Figure 8-15. USB Control Register

The USB Control Register controls various USB functions. This register is read/write by the MCU only.

Table 8-19. USB Control Register