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Preliminary
USB2.0 DEVICE
S3C2451X RISC MICROPROCESSOR
17-10
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
ENDPOINT DIRECTION REGISTER (EDR)
USB 2.0 Core supports IN/OUT direction control for each endpoint. This direction can’t be changed dynamically.
Only by new enumeration, the direction can be altered. Since the endpoint 0 is bi-directional, there is no direction
bit assigned to it.
Register Address
R/W
Description
Reset
Value
EDR 0x4980_0014
R/W
Endpoint
Direction Register
0x0
EDR Bit
R/W
Description
Initial
State
[31:9]
Reserved
EP8DS
[8]
R/W
Endpoint 8 Direction Select
0
EP7DS
[7]
R/W
Endpoint 7 Direction Select
0
EP6DS
[6]
R/W
Endpoint 6 Direction Select
0
EP5DS
[5]
R/W
Endpoint 5 Direction Select
0
EP4DS
[4]
R/W
Endpoint 4 Direction Select
0
EP3DS
[3]
R/W
Endpoint 3 Direction Select
0
EP2DS
[2]
R/W
Endpoint 2 Direction Select
0
EP1DS
[1]
R/W
Endpoint 1 Direction Select
0: Rx Endpoint
1: Tx Endpoint
0
[0]
Reserved