Port0:120H-121H / Port1:N/A D_Descadrs_H,L; (Device Descriptor Address High, Low) - Epson S2R72V18 Technical Manual

3. Register Details
3.2.59 Port0:120h-121h / Port1:N/A D_DescAdrs_H,L (Device Descriptor Address High, Low)
Base Address: Port0=000h, Port1=200h
Mode Ofst Adrs Register Name
Device 120h-121h D_DescAdrs_H,L
This specifies the descriptor address.
Bit15-13 Reserved
Bit12-0 DescAdrs[12:0]
This specifies the initial FIFO address for the descriptor reply function when starting the descriptor
reply operation.
The descriptor address does not assign FIFO areas to the descriptor reply function. The descriptor
address can specify all areas of the FIFO from 0x0000 to 0x11FF (4.5 kbytes), regardless of FIFO
area settings.
DescAdrs is updated by the amount of data transmitted each time an IN transaction is completed for
endpoint EP0 when returning the descriptor reply. For detailed information on the descriptor reply
function, refer to D_EP0Control register ReplyDescriptor section.
Since the FIFO area for the descriptor reply function is not explicitly assigned, avoid duplication
with the FIFO for other endpoints using D_DescAdrs_H,L and D_DescSize_H,L register
specifications. Ideally, this should be from the address (0x0030) after the CSW area has been
reserved to the first address of the area reserved in AREA0 to 5.
316
R/W Bit Symbol
15:
14:
13:
12: DescAdrs[12]
11: DescAdrs [11]
10: DescAdrs [10]
9: DescAdrs [9]
8: DescAdrs [8]
7: DescAdrs [7]
R/W
6: DescAdrs [6]
5: DescAdrs [5]
4: DescAdrs [4]
3: DescAdrs [3]
2: DescAdrs [2]
1: DescAdrs [1]
0: DescAdrs [0]
EPSON
Description
0:
0:
0:
Descriptor Address
S2R72V18 Technical Manual (Rev.1.00)
Reset
1:
1:
1:
0000h