SL811HS
USB-A/USB-B Host Transfer Count Register (Read), USB Address (Write) [Address = 04h, 0Ch].
This register has two
different functions depending on whether it is read or written. When read, this register contains the number of bytes remaining (from
Host Base Length value) after a packet is transferred. For example, if the Base Length register is set to 0x040 and an IN Token was
sent to the peripheral device. If, after the transfer is complete, the value of the Host Transfer Count is 0x10, the number of bytes
actually transferred is 0x30. This is considered as an underflow indication.
Table 8. USB-A / USB-B Host Transfer Count Register when READ [Address 04h, 0Ch]
Bit 7
HTC7
Bit 6
HTC6
Bit 5
HTC5
Bit 4
HTC4
Bit 3
HTC3
Bit 2
HTC2
Bit 1
HTC1
Bit 0
HTC0
When written, this register contains the USB Device Address with which the Host communicates.
Table 9. USB-A / USB-B USB Address when WRITTEN [Address 04h, 0Ch]
Bit 7
0
DA6-DA0
DA7
Bit 6
DA6
Bit 5
DA5
Bit 4
DA4
Bit3
DA3
Bit 2
DA2
Bit 1
DA1
Bit 0
DA0
Device address, up to 127 devices can be addressed.
Reserved bit must be set to zero.
SL811HS Control Registers
The next set of registers are the Control registers and control more of the operation of the chip instead of USB packet type of transfers.
is a summary of the control registers.
Table 10. Control Registers Summary
Register Name SL811H
Control Register 1
Interrupt Enable Register
Reserved Register
Status Register
SOF Counter LOW (Write)/HW Revision Register (Read)
SOF Counter HIGH and Control Register 2
Memory Buffer
SL811HS (hex) Address
05h
06h
07h
0Dh
0Eh
0Fh
10h-FFh
Document 38-08008 Rev. *F
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