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
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
HTC7
HTC6
HTC5
HTC4
HTC3
HTC2
HTC1
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
Bit 6
Bit 5
Bit 4
Bit3
Bit 2
Bit 1
Bit 0
0
DA6
DA5
DA4
DA3
DA2
DA1
DA0
DA6-DA0
DA7
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.
Table 10 is a summary of the control registers.
Table 10. Control Registers Summary
Register Name SL811H
SL811HS (hex) Address
Control Register 1
Interrupt Enable Register
Reserved Register
Status Register
05h
06h
07h
0Dh
SOF Counter LOW (Write)/HW Revision Register (Read)
SOF Counter HIGH and Control Register 2
Memory Buffer
0Eh
0Fh
10h-FFh
Document 38-08008 Rev. *F
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