Cypress SL811HS Manual De Usuario
SL811HS
Document 38-08008 Rev. *D
Page 7 of 32
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.
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.
When written, this register contains the USB Device Address with which the Host communicates.
DA6-DA0
Device address, up to 127 devices can be addressed.
DA7
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.
transfers.
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
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
Table 10. SL811HS Control Registers Summary
Register Name SL811H
SL811HS (hex) Address
Control Register 1
05h
Interrupt Enable Register
06h
Reserved Register
07h
Status Register
0Dh
SOF Counter LOW (Write)/HW Revision Register (Read)
0Eh
SOF Counter HIGH and Control Register 2
0Fh
Memory Buffer
10h-FFh