SL811HS
Document 38-08008 Rev. *D
Page 13 of 32
Endpoint Control Registers
Endpoint n Control Register [Address a = (EP# * 10h), b = (EP# * 10h)+8]. Each endpoint set has a Control register defined
as follows:
Endpoint Base Address [Address a = (EP# * 10h)+1, b = (EP# * 10h)+9]]. Pointer to memory buffer location for USB reads
and writes.
Endpoint Base Length [Address a = (EP# * 10h)+2, b = (EP# * 10h)+A]. The Endpoint Base Length is the maximum packet
size for IN/OUT transfers with the host. Essentially, this designates the largest packet size that is received by the SL811HS with
an OUT transfer, or it designates the size of the data packet sent to the host for IN transfers.
Table 22. Endpoint Control Register [Address EP0a/b:00h/08h, EP1a/b:10h/18h, EP2a/b:20h/28h, EP3a/b:30h/38h]
7
6
5
4
3
2
1
0
Reserved
Sequence
Send STALL
ISO
Next Data Set
Direction
Enable
Arm
Bit Position
Bit Name
Function
7
Reserved
6
Sequence
Sequence bit. '0' if DATA0, '1' if DATA1.
5
Send STALL
When set to ‘1’, sends Stall in response to next request on this endpoint.
4
ISO
When set to '1', allows Isochronous mode for this endpoint.
3
Next Data Set
'0' if next data set is ‘A’, '1' if next data set is 'B'.
2
Direction
When Direction = '1', transmit to Host (IN). When Direction = '0', receive from Host (OUT).
1
Enable
When Enable = '1', allows transfers for this endpoint. When set to ‘0’, USB transactions are
ignored. If Enable = '1' and Arm = '0', the endpoint returns NAKs to USB transmissions.
0
Arm
Allows enabled transfers when set =’1’. Clears to '0' when transfer is complete.
Table 23. Endpoint Base Address Reg [Address; EP0a/b:01h/09h, EP1a/b:11h/19h, EP2a/b:21h/29h, EP3a/b:31h/39h]
7
6
5
4
3
2
1
0
EPxADD7
EPxADD6
EPxADD5
EPxADD4
EPxADD3
EPxADD2
EPxADD1
EPxADD0
Table 24. Endpoint Base Length Reg [Address EP0a/b:02h/0Ah, EP1a/b:12h/1Ah, EP2a/b:22h/2Ah, EP3a/b:32h/3Ah]
7
6
5
4
3
2
1
0
EPxLEN7
EPxLEN6
EPxLEN5
EPxLEN4
EPxLEN3
EPxLEN2
EPxLEN1
EPxLEN0
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